Voice iOS SDK Changelog

Welcome to the Programmable Voice iOS SDK

The Twilio Programmable Voice SDKs allow you to add voice-over-IP (VoIP) calling to your native iOS applications.

6.7.0

May 17, 2023

• Programmable Voice iOS SDK 6.7.0 [XCFramework] (checksum: 97f1d2af07f308327f392fb347ce19e7a0711f1b8c8050b55c33afc78f8fbaef).

API Updates

• The SDK now supports sending and receiving user-defined messages via the TVOCallInvite before it is answered or rejected. Sending user-defined messages while call is still ringing (before connected) is also supported now.

Example of sending and receiving call messages via the TVOCallInvite:

// Pass `CallMessageDelegate` in the `handleNotification()` method
TwilioVoiceSDK.handleNotification(payload.dictionaryPayload, delegate: self, delegateQueue: nil, callMessageDelegate: self)

// MARK: - NotificaitonDelegate
func callInviteReceived(callInvite: CallInvite) {
    let message = "{ \"foo\": \"bar\", \"marco\": \"polo\" }"
    let callMessage = CallMessage(content: message)

    // voiceEventSid can be used for tracking the message
    let voiceEventSid = callInvite.sendMessage(callMessage)
}

// MARK: - CallMessageDelegate
func callInviteDidSendMessage(callInvite: CallInvite, voiceEventSid: String) {
    NSLog("Call message sent. Voice Event SID: \(voiceEventSid)")
}

func callInviteDidFailToSendMessage(callInvite: CallInvite, voiceEventSid: String, error: Error) {
    NSLog("Failed to send call message. Voice Event SID: \(voiceEventSid). Error: \(error.localizedDescription)")
}

func callInviteDidReceiveMessage(callInvite: CallInvite, callMessage: CallMessage) {
    NSLog("Call message received: \(callMessage.content)")
}

• Bitcode support is disabled since App Store no longer accepts bitcode submission from Xcode 14. (Release notes)

Size Impact for 6.7.0

6.5.2

May 12, 2023

• Programmable Voice iOS SDK 6.5.2 [XCFramework] (checksum: a14e7c33c1f78dbe650264cdf5808e7a306bfaecadc2fbac4e1bc1214263765d).

API updates

• TVODefaultAudioDevice class now has a property ignoresPreferredAttributeConfigurationErrors to ignore errors during AVAudioSession setup. This is to mitigate the WebRTC issue reported here

Size Impact for 6.5.2

6.5.0

December 5, 2022

• Programmable Voice iOS SDK 6.5.0 [XCFramework] (checksum: 6a0cd9726e992582cb2cb20b6e6721cbb371de19dc67edaef611d92398d4e269).

API updates

• The SDK now supports sending and receiving in-call user-defined messages. Use the [TVOCall sendMessage:] method to send messages. Endpoints subscribed to the events of the call will be receiving the messages. The [TVOCallMessageDelegate call:didReceiveMessage:] callback will be raised to the application when a message is received by the client.

Please visit this page for more details about this feature. Additionally, please see the following for more information on how to send and receive messages on the server.

• UserDefinedMessage
• UserDefinedMessageSubscription

NOTE: This feature should not be used with PII.

• The TVOCallMessage class and the TVOCallMessageBuilder class are introduced to represent the call messages.

Example of sending a call message:

let call = TwilioVoiceSDK.connect(options: connectOptions, delegate: self)

// wait for call to be connected

let message = "{ \"foo\": \"bar\", \"marco\": \"polo\" }"
let callMessage = CallMessage(content: message)

// voiceEventSid can be used for tracking the message
let voiceEventSid = call.sendMessage(callMessage)

extension ViewController: CallMessageDelegate {
    func callDidSendMessage(call: Call, voiceEventSid: String) {
        NSLog("Call message sent. Voice Event SID: \(voiceEventSid)")
    }

    func callDidFailToSendMessage(call: Call, voiceEventSid: String, error: Error) {
        NSLog("Failed to send call message. Voice Event SID: \(voiceEventSid). Error: \(error.localizedDescription)")
    }        
}

Example of handling incoming call messages:

extension ViewController: CallMessageDelegate {

    func callDidReceiveMessage(call: Call, message callMessage: CallMessage) {
        NSLog("Call message received. Message: \(callMessage.content)")
    }

}

Size Impact for 6.5.0

6.4.2

July 11, 2022

• Programmable Voice iOS SDK 6.4.2 [XCFramework] (checksum: caebcfde5540e6aefeab61edb5d131c55565eb72b690fc50e8201836f0c21735).

API Updates

• The writable property of the TVOIceCandidatePairStats class has been renamed to writeable.
• New edge umatilla is now supported. Set the TwilioVoiceSDK.edge property before connecting or accepting the call.

Bug Fixes

• Fixed a symbol conflict (RTCNativeAudioSessionDelegateAdapter) when using the SDK side by side with another WebRTC library.

Size Impact for 6.4.2

6.4.1

May 26, 2022

• Programmable Voice iOS SDK 6.4.1 [XCFramework] (checksum: 16080af560c584f574d00c04af408e340253f814b583b7920a718d66ed5ea6dd ).

Bug Fixes

• Fixed a crash when the home region specifier (twr) in the access token is null.

Size Impact for 6.4.1

6.4.0

May 3, 2022

• Programmable Voice iOS SDK 6.4.0 [XCFramework] (checksum: 5bb8ab2aa8f9f2e91d243e64c5e850cdc0c1365f4bfc64a37532b0688d118770).

API updates

• The Voice iOS SDK now supports Twilio Regional by providing the home region specifier in the access token header when calling the TwilioVoiceSDK.register() method, the TwilioVoiceSDK.unregister() method, and the TwilioVoiceSDK.connect() method.

Existing customers can now migrate their Voice use-cases to data centers in Ireland or Australia to establish data residency within the region. In addition, new customers may now select Ireland or Australia as their region of choice for Voice related use cases. There is no additional cost to use the new data centers in Ireland or Australia. To learn more about Regional Voice, check out our blog post or head over to our developer docs to get started.

Example of specifying home region in the access token using the Twilio Node.js helper library:

const accessToken = new twilio.jwt.AccessToken(
    credentials.accountSid,
    credentials.apiKeySid,
    credentials.apiKeySecret, {
      identity,
      ttl,
      region: 'au1',
    },
  );

The decoded header of your access token should looks like this:

{
  "alg": "HS256",
  "typ": "JWT",
  "cty": "twilio-fpa;v=1",
  "twr": "au1"
}

Maintenance

• Updated API doc of [TVOCall getStatsWithBlock:].

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.4.0

6.3.1

February 8, 2022

• Programmable Voice iOS SDK 6.3.1 [XCFramework] (checksum: 08e5839eb77d8746baff8b132059f0babfb9e1ed860903553b7d9c02411442af ).

Enhancements

• The Voice SDK now validates full remote domain names while setting up the TLS connection.
• The Voice SDK now uses the maximum timeout value 10 minutes to answer an incoming call.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.3.1

6.3.0

May 17, 2021

Enhancements

• This release is based on Chromium WebRTC 88.
• The simulator arm64 architecture on Apple Silicon Macs is now available.
• The SDK uses Unified Plan SDP semantics instead of Plan-B.

Known Issues

• Carthage is not currently a supported distribution mechanism for Twilio Voice. Carthage does not currently work with .xcframeworks as documented here. Once Carthage supports binary .xcframeworks, Carthage distribution will be re-added.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.3.0

5.5.2

March 29, 2021

• Programmable Voice iOS SDK 5.5.2 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• Fixed a potential crash in the core module where the logger could be accessed after being destroyed by another thread. #419
• Fixed a bug where caller might not receive the [TVOCallDelegate call:didDisconnectiWithError:] callback when callee hangs up.
• Fixed a bug where callee was not receiving the [TVONotificationDelegate cancelledCallInviteReceived:error:] callback when signaling connection error happens.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.5.2

6.2.2

March 11, 2021

Bug Fixes

• Fixed the SDK version number in the Info.plist file of the framework.
• Fixed a potential crash in the core module where the logger could be accessed after being destroyed by another thread. #419

Known Issues

• The TwilioVoice.xcframework does not currently support the simulator on Apple Silicon arm64 Macs.
• Carthage is not currently a supported distribution mechanism for Twilio Voice. Carthage does not currently work with .xcframeworks as documented here. Once Carthage supports binary .xcframeworks, Carthage distribution will be re-added.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.2.2

6.2.1

February 4, 2021

Bug Fixes

• Fixed platform version in podspecs.

Known Issues

• The TwilioVoice.xcframework does not currently support the simulator on Apple Silicon arm64 Macs.
• Carthage is not currently a supported distribution mechanism for Twilio Voice. Carthage does not currently work with .xcframeworks as documented here. Once Carthage supports binary .xcframeworks, Carthage distribution will be re-added.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.2.1

6.2.0

February 1, 2021

Enhancements

• The Voice iOS SDK is built with Xcode 12.0.
• Twilio Voice is now delivered as an .xcframework. The .xcframework package includes the .dSYM and .bcsymbolmap files to allow developers to symbolicate crash reports.
• Twilio Voice is now distributed as a Swift Package.

Known Issues

• The TwilioVoice.xcframework does not currently support the simulator on Apple Silicon arm64 Macs.
• Carthage is not currently a supported distribution mechanism for Twilio Voice. Carthage does not currently work with .xcframeworks as documented here. Once Carthage supports binary .xcframeworks, Carthage distribution will be re-added.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 6.2.0

6.1.0

January 7, 2021

• Programmable Voice iOS SDK 6.1.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Private IP addresses are masked in Release mode for the SDK logs and the ice-candidate Insights event payload.
• Private IP addresses will not be masked in Debug mode. The selected-ice-candidate-pair event will contain private IP address of the local active ICE candidate for debugging purpose in both Release and Debug modes.

Bug fixes

• Fixed a bug where caller might not receive the call:didDisconnectWithError: callback when the callee hangs up.
• Fixed a bug where callee was not receiving the cancelledCallInviteReceived:error: callback when signaling connection error happens.
• The Voice SDK had the same TwilioVoice framework name and the class name. This was causing swift compile time errors when an app tries to access a TwilioVoice framework's class using the module name, e.g. TwilioVoice.ConnectOptions. Fixed this issues by renaming the TwilioVoice class name to TwilioVoiceSDK.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size impact for 6.1.0

6.0.2

November 4, 2020

• Programmable Voice iOS SDK 6.0.2 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug fixes

• Fixed Swift compile time error for AudioDeviceWorkerBlock.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size impact for 6.0.2

6.0.1

November 2, 2020

• Programmable Voice iOS SDK 6.0.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug fixes

• Fixed Swift compile time error for AudioDeviceContext.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size impact for 6.0.1

6.0.0

September 15, 2020

• Programmable Voice iOS SDK 6.0.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API change

• The Voice SDK has been updated for better Swift interoperability.

  • The TVO prefix has been removed from all Twilio Voice types
  • Many of the delegate function declarations have been revamped for better clarity of their intent
  • Some of the class method declarations have been revamped for better clarity of their intent

• This release has improved API for CallKit integration. In order to use CallKit with SDK, you must set ConnectOptions.uuid or AcceptOptions.uuid while making or answering a Call. When ConnectOptions.uuid or AcceptOptions.uuid is set, it is your responsibility to enable and disable the audio device. You should enable the audio device in [CXProviderDelegate provider:didActivateAudioSession:], and disable the audio device in [CXProviderDelegate provider:didDeactivateAudioSession:].

    func provider(_ provider: CXProvider, didActivate audioSession: AVAudioSession) {
      audioDevice.isEnabled = true
    }

    func provider(_ provider: CXProvider, didDeactivate audioSession: AVAudioSession) {
      audioDevice.isEnabled = false
    }

    func providerDidReset(_ provider: CXProvider) {
      audioDevice.isEnabled = false
    }

If you are not using CallKit in your app, you must not set ConnectOptions.uuid or AcceptOptions.uuid while making or answering a call. The Voice SDK will enable the audio device for you when the uuid is nil.

• The uuid property of TVOCall is now optional.
• This release changes the underlying behavior of [TVOCallDelegate callDidConnect:] such that it is raised when both ICE connection state is connected and DTLS negotiation has completed. Previously [TVOCallDelegate callDidConnect:] was raised when the DTLS negotiation had completed.
• In this release, [TVOCallDelegate callDidConnect:] is raised when both the ICE connection state is connected and DTLS negotiation has completed. There is no change in behavior however the SDK can detect DTLS failures and raise kTVOMediaDtlsTransportFailedErrorCode if they occur.
• Defined new error code

• PeerConnection state is now reported to Insights

• Removed the deprecated property TwilioVoice.region. Use TwilioVoice.edge to control the connectivity with Twilio.

• The [TwilioVoice registerWithAccessToken:deviceTokenData:completion:] and the [TwilioVoice unregisterWithAccessToken:deviceTokenData:completion:] have been renamed to replace the [TwilioVoice registerWithAccessToken:deviceToken:completion:] and the [TwilioVoice unregisterWithAccessToken:deviceToken:completion:] methods and now take the NSData type device token as parameter.

Enhancements

• This release is based on Chromium WebRTC 83.
• TwilioVoice.framework is now built with Xcode 11.4.1
• A new Insights event selected-ice-candidate-pair is reported with the active local ICE candidate and remote ICE candidate.

• mos calculation algorithm has been updated to make it monotonically decreasing with increasing jitter and packets-lost-fraction values over a range of rtt values. The final mos should always be in the range [1.0, 4.6].

Maintenance

• Added a security patch to prevent host candidate DNS attacks. See Issue 11597 for details.

Bug fixes

• Fixed a crash when processing of empty stats reports or stats reports without remote audio tracks.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size impact for 6.0.0

5.5.1

September 15, 2020

• Programmable Voice iOS SDK 5.5.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• Fixed the background task handling in [TVOCall disconnect], [TVOCallInvite reject], [TwilioVoice registerWithAccessToken:deviceTokenData:completion:] and [TwilioVoice unregisterWithAccessToken:deviceTokenData:completion:]. iOS should no longer report a background task risk of termination warning.
• Fixed a crash when processing of empty stats reports or stats reports without remote audio tracks.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.5.1

5.5.0

July 9, 2020

• Programmable Voice iOS SDK 5.5.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API Change

• A TVOCallerInfo class is introduced to represent information about the caller. Currently, this information is limited to SHAKEN/STIR status of incoming PSTN Calls, but may later be expanded to include CNAM, and other endpoint types. The verified property represents whether or not the caller's phone number has been verified by Twilio using SHAKEN/STIR validation. The value of this attribute is true if the caller has been validated at 'A' level, false if the caller has been verified at any lower level or has failed validation. If SHAKEN/STIR information is unavailable for the caller or stir status value is null, the property will be nil. For details on how Twilio uses SHAKEN/STIR to make trusted calls and protect against unlawful spoofing, please visit https://www.twilio.com/docs/voice/trusted-calling-using-shakenstir.

• New property callerInfo in TVOCallInvite returns the TVOCallerInfo object to represent the information about the caller.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.5.0

5.4.1

June 25, 2020

• Programmable Voice iOS SDK 5.4.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• Fixed a crash that could occur when destroying the TVOCall or TVOCallInvite object.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.4.1

5.4.0

June 3, 2020

• Programmable Voice iOS SDK 5.4.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API Change

• This release includes support for the expansion of Twilio’s Global Infrastructure via Edge Locations which allows customers to control their connectivity into and out of Twilio’s platform. The Voice iOS SDK uses these Edges to connect to Twilio’s infrastructure via the new property TwilioVoice.edge. This new property supersedes the now deprecated TwilioVoice.region. See the new Edge names and how they map to the old region names.

Here is an example

  // Connect using global low latency
  TwilioVoice.edge = "roaming"

• This release also adds the Mean Opinion Score (MOS) measurement mos to TVORemoteAudioTrackStats. Use [TVOCall getStatsWithBlock:] during a call to retrieve the score. The mos is computed once per second. Since the MOS is calculated from network performance measurements, it can be used to indicate the current network condition to the user to provide better usability. See API Docs for more information

Example

  call.getStatsWith { (reports) in
      for report in reports {
          let remoteAudioTracksStats = report.remoteAudioTrackStats
          let mosLabel = "\(remoteAudioTracksStats.mos)"
      }
  }

Enhancements

• Network degradation warnings were previously only logged to Insights. With this release, a new TVOCallDelegate method call:didReceiveQualityWarnings:previousWarnings: is also invoked when the SDK detects those degradations. Use these to relay network condition to the user to provide a better user experience. See the delegate method and callQualityWarnings for more information.

• The Mean Opinion Score (MOS) is now available in TVOStatsReport. Use [TVOCall getStatsWithBlock:] during a Call to retrieve the score. Since the MOS is calculated from network performance measurements, it can be used to indicate the current network condition to the user to provide better usability.

• By default ICE gathering is done on all interfaces except some VPN type interfaces. This makes it impossible to connect to Twilio in networks that require the use of VPN. In this release, the new boolean property enableIceGatheringOnAnyAddressPorts in TVOCallOptionsBuilder allows the gathering of ICE candidates from all available interfaces. This should be used in those networks where the default does not work. See enableIceGatheringOnAnyAddressPorts for more information.

Deprecations

• TwilioVoice.region is now deprecated. Use TwilioVoice.edge instead. See the new Edge names for possible values.

Bug Fixes

• Fixed a bug where the SDK was still raising the [TVOCallDelegate callDidStartRinging:] callback if [TVOCall disconnect] was called.
• Fixed a crash caused by a signaling race condition when user rejects a TVOCallInvite.

Other

• armv7 builds are no longer available or supported.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.4.0

5.3.1

April 9, 2020

• Programmable Voice iOS SDK 5.3.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Improvements

• Optimized [TwilioVoice unregisterWithAccessToken:deviceTokenData:completion:] by reducing the number of network requests.
• Added background handling support to [TwilioVoice registerWithAccessToken:deviceTokenData:completion:] and [TwilioVoice unregisterWithAccessToken:deviceTokenData:completion:]. They will now finish execution even when the app is backgrounded.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.3.1

5.3.0

March 18, 2020

• Programmable Voice iOS SDK 5.3.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API Changes

• New methods to register and unregister for VoIP push notifications have been added that rely on NSData rather than NSString. The previous register and unregister methods have been deprecated in favor of these new methods.

// TwilioVoice.h

+ (void)registerWithAccessToken:(nonnull NSString *)accessToken
                deviceTokenData:(nonnull NSData *)deviceTokenData
                     completion:(nullable void(^)(NSError * __nullable error))completion
NS_SWIFT_NAME(register(withAccessToken:deviceToken:completion:));

+ (void)unregisterWithAccessToken:(nonnull NSString *)accessToken
                  deviceTokenData:(nonnull NSData *)deviceTokenData
                       completion:(nullable void(^)(NSError * __nullable error))completion
NS_SWIFT_NAME(unregister(withAccessToken:deviceToken:completion:));

Swift example

  func pushRegistry(_ registry: PKPushRegistry, didUpdate credentials: PKPushCredentials, for type: PKPushType) {
      TwilioVoice.register(withAccessToken: accessToken, deviceToken: credentials.token) { (error) in
          if let error = error {
              NSLog("An error occurred while registering: \(error.localizedDescription)")
          } else {
              NSLog("Successfully registered for VoIP push notifications.")
          }
      }
  }

Objective-C example

- (void)pushRegistry:(PKPushRegistry *)registry 
didUpdatePushCredentials:(PKPushCredentials *)credentials 
             forType:(NSString *)type {
    [TwilioVoice registerWithAccessToken:accessToken
                         deviceTokenData:credentials.token
                              completion:^(NSError *error) {
        if (error) {
            NSLog(@"An error occurred while registering: %@", [error localizedDescription]);
        } else {
            NSLog(@"Successfully registered for VoIP push notifications.");
        }
    }];
}

Bug Fixes

• Fixed Voice Insights data with valid transport_id value.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.3.0

5.2.1

March 11, 2020

• Programmable Voice iOS SDK 5.2.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• Fixed duplicated symbol linker errors in the static library.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.2.1

5.2.0

February 27, 2020

• Programmable Voice iOS SDK 5.2.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Attempts to re-establish the media connection will be done preemptively if no media flow is detected for 3 seconds.
• An ongoing call will automatically switch to a more preferred network type if one becomes available. The following are the network types listed in preferred order: ETHERNET, LOOPBACK, WIFI, VPN, and CELLULAR. For example, if a WIFI network becomes available whilst in a call that is using CELLULAR data, the call will automatically switch to using the WIFI network.
• Proper data types are added to the Insights event payload.

Bug Fixes

• Fixed a crash when a canceled call invite is received but the from value is nil.

Things to Note

• Since media and signaling reconnect are two completely separate processes, it is likely that for a single network change event multiple [TVOCallDelegate call:isReconnectingWithError:] and [TVOCallDelegate callDidReconnect:] callbacks will be received in the order specified i.e a [TVOCallDelegate call:isReconnectingWithError:] callback will always be followed by a [TVOCallDelegate callDidReconnect:] callback.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.2.0

5.1.2

February 24, 2020

• Programmable Voice iOS SDK 5.1.2 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• Fixed a crash when a canceled call invite is received and the from value is nil.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.1.2

5.1.1

December 9, 2019

• Programmable Voice iOS SDK 5.1.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Application name, bundle ID, version, build number, Xcode version and min/major SDK version are now published to Insights. This helps with isolating problems if an issue is encountered.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.1.1

5.1.0

November 19, 2019

• Programmable Voice iOS SDK 5.1.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Incoming call handling improvements. Previously, if we encountered network issues before an incoming call was answered or rejected, we disconnected the call. With this release, we will continue to try and establish a connection to Twilio for a maximum of 40 seconds before we disconnect the call.
• We added support for OpenSSL 1.1.x in the static library version of our SDK. To use this flavor of the SDK, please refer to the instructions included in the Static Library
• We now publish the negotiated codec and its associated parameters to Insights.

Other Improvements

• Improved the way we perform DNS resolution. Previously, some DNS requests could indirectly block the main thread. This is no longer the case.
• listening-error event level was incorrectly reported as INFO instead of ERROR to insights.

Deprecated

• Removed support for the iOS i386 architecture (32-bit iOS Simulator)

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.1.0

5.0.0

September 19, 2019

• Programmable Voice iOS SDK 5.0.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

iOS 13 & Xcode 11 Support

This release adds support for the new PushKit push notification policy that iOS 13 and Xcode 11 introduced. To upgrade your application please follow the migration guide.

Insights

To provide observability for incoming call cancellations the following Insights events have been added:

API Changes

• Starting with 5.0.0, when [TwilioVoice registerWithAccessToken:deviceToken:completion:] is called, the Voice SDK will only register for "call" push notifications and cancelled call invites will be determined internally by the SDK. [TwilioVoice handleNotification:delegate:delegateQueue:] no longer processes "cancel" push notification payloads and will returnfalse if provided with a cancel notification.
• A valid call push notification, when passed to [TwilioVoice handleNotification:delegate:delegateQueue:], will still result in a TVOCallInvite being raised [TVONotificationDelegate callInviteReceived:]. A TVOCancelledCallInvite will be raised asynchronously via [TVONotificationDelegate cancelledCallInviteReceived:error:] if any of the following events occur:
• The call is prematurely disconnected by the caller.
• The callee does not accept or reject the call in approximately 30 seconds.

• The Voice SDK is unable to establish a connection to Twilio. You must retain the TVOCallInvite to be notified of a cancellation via [TVONotificationDelegate cancelledCallInviteReceived:error:]. A TVOCancelledCallInvite will not be raised if the invite is accepted or rejected.

• [TwilioVoice handleNotification:delegate:] is now [TwilioVoice handleNotification:delegate:delegateQueue:]

• delegateQueue: the dispatch queue where the [TVONotificationDelegate cancelledCallInviteReceived:error:] callback is received. If nil is passed, the dispatch main queue will be used.
• When a "call" notification is received, the Voice SDK will fire the [TVONotificationDelegate callInviteReceived:] callback synchronously.
• When a "cancel" notification is received, the method will return false.
• [TVONotificationDelegate cancelledCallInviteReceived:] is now [TVONotificationDelegate cancelledCallInviteReceived:error:]

• The error indicates that the call was canceled as a result of an error. The error.code will be set to TVOErrorCallCancelledError if a caller cancels the call before the called party could answer the call.

• The property enableInsights has been renamed to insights and moved from TVOCallOptions.h to TwilioVoice.h.

• The property region has moved from TVOCallOptions.h to TwilioVoice.h. If you are specifying a region via the TwilioVoice.h region property you must now do so before [TwilioVoice connectWithAccessToken:delegate:] or [TwilioVoice handleNotification:delegate:delegateQueue:] is called.

• Class method [TVOCallInvite isValid:] is added to TVOCallInvite for apps to validate whether the notification payload is a valid call notification sent by Twilio. A valid notification payload will result in a TVOCallInvite being returned via the [TVONotificationDelegate callInviteReceived:] callback when passed to [TwilioVoice handleNotification:delegate:delegateQueue:].

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 5.0.0

4.3.0

August 19, 2019

• Programmable Voice iOS SDK 4.3.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

Differentiated Services Code Point (DSCP) Tagging API

The Differentiated Services Code Point (DSCP) Tagging API allows you to mark the audio packets with Expedited Forwarding (EF) for the purposes of improved packet routing. When enabled, supporting networks will prioritize audio packet delivery for improved audio quality.

Use enableDscp to enable or disable DSCP tagging. Note, enableDscp is enabled by default. For example:

// Configure DSCP with `TVOConnectOptions`
let connectOptions = TVOConnectOptions(accessToken: accessToken) { (builder) in
    builder.enableDscp = true
}

let call = TwilioVoice.connect(with: connectOptions, delegate: callDelegate)

// Configure DSCP with `TVOAcceptOptions`
let acceptOptions = TVOAcceptOptions(accessToken: accessToken) { (builder) in
    builder.enableDscp = true
}

let call = callInvite.accept(with: acceptOptions, delegate: callDelegate)

For more information, refer to the docs.

Known Issues

• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 4.3.0

4.2.1

August 8, 2019

• Programmable Voice iOS SDK 4.2.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

This release includes changes in how the static library libTwilioVoice.a is built and packaged. libTwilioVoice.a now contains all the dependencies of the static libraries. Use -lTwilioVoice in the Other Linker Flags setting to link the SDK. BoringSSL is not packaged as a separate artifact.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 4.2.1

4.2.0

August 7, 2019

• Programmable Voice iOS SDK 4.2.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

Custom Parameters in Canceled Call Notification

You can now retrieve the custom parameters set in your TwiML application from TVOCancelledCallInvite. With this addition, you can for example, display a missed call notification with the caller’s display name retrieved from the TVOCancelledCallInvite customParameters.

For more information, refer to the API docs

Pass custom parameters in TwiML

  <?xml version="1.0" encoding="UTF-8"?>
  <Response>
    <Dial callerId="client:alice">
      <Client>
        <Identity>bob</Identity>
        <Parameter name="caller_first_name" value="alice" />
        <Parameter name="caller_last_name" value="smith" />
      </Client>
    </Dial>
  </Response>

cancelledCallInvite.customParameters:

  {
    "caller_first_name" = "alice";
    "caller_last_name" = "smith";
  }

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 4.2.0

4.1.0

July 15, 2019

• Programmable Voice iOS SDK 4.1.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

New Features

Max Average Bandwidth API

By default, the Opus codec is set up with a transmission rate of around 32 kbps (40-50kbps on the wire). With this release, you are able to set a custom max average bitrate to better control how much bandwidth your VoIP application should use. See RFC-7587 section 7.1 for information about Max Average Bitrate.

The main purpose of this API is to set a lower max average bitrate to minimise bandwidth usage. This is particularly useful in deployments where bandwidth is at a premium. Where bandwidth is not of concern, you do not need to use this API.

Max Average Bitrate can be set to as low as 6,000bps and as high as 51,000 bps. Values outside this range are ignored and the default Opus operation mode is used. See API Docs for more information.

As would be expected, lowering the max average bitrate impacts audio quality. We don’t recommend setting max average bitrate to a value below 8,000 bps. On the other hand, setting values over 32,000 bps will have negligible audio quality improvements.

For example, to set a new max average bitrate to 16,000 bps:

let connectOptions = TVOConnectOptions(accessToken: accessToken) { (builder) in
    builder.params = params
    builder.preferredAudioCodecs = [TVOOpusCodec(maxAverageBitrate: 16000)]
}

let call = TwilioVoice.connect(with: connectOptions, delegate: callDelegate)

Other Enhancements

• Programmable Voice iOS SDK transmits data for VoIP calls and for Insights. With this release, we have reduced Insights related data consumption by around 25%. This was accomplished by reducing the events reporting interval.
• CLIENT-6358 The SDK now reports ice-candidate events to Insights. These events are raised when OnIceCandidate is called on the PeerConnection.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 4.1.0

4.0.0

June 28, 2019

• Programmable Voice iOS SDK 4.0.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

New Features

Reconnecting State API

This release introduces the new Reconnecting State API. This API adds a new state TVOCallStateReconnecting to TVOCallState and two new optional TVOCallDelegate methods, call:isReconnectingWithError: and callDidReconnect:.

Call reconnection capability has been available since SDK 3.0. For example, if a call is established over a wifi network and the wifi network becomes unavailable, the SDK will automatically switch the call over to the next available network.

This release adds the reconnection related callbacks. call:isReconnectingWithError: is invoked to indicate a call is being reconnected due to a network disruption or network switch over and callDidReconnect: is called once the call has been re-connected. You can use this information to provide intuitive feedback to your App user when a reconnection is taking place.

Enhancements

Passing a malformed callee to either [TwilioVoice connectWithAccessToken:] or [TwilioVoice connectWithOptions:delegate:] will now result in TVOErrorAddressIncompleteError

Migration Guide

Migrating from 3.x is very simple. Please refer to our migration guide for more information.

Known Issues

• Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Impact for 4.0.0

3.1.1

June 6, 2019

• Programmable Voice iOS SDK 3.1.1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-6220 Fixed an issue where an NSInvalidArgumentException exception is raised while connecting a call. #13

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.1.0

May 16, 2019

• Programmable Voice iOS SDK 3.1.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

Improved error codes

We now surface more details about errors encountered during [TwilioVoice registerWithAccessToken:deviceToken:completion:], [TwilioVoice unregisterWithAccessToken:deviceToken:completion:], [TwilioVoice connectWithOptions:delegate:], and [TVOCallInvite acceptWithOptions:delegate:]. Previously, these functions reported these errors with the generic error TVOErrorRegistrationError or TVOErrorConnectionError.

With the new error codes, you can make more informed decisions with how to remedy the problem. For example, TVOErrorBadRequestError and TVOErrorTooManyRequestsError indicate potential programming issues, while TVOErrorTokenAuthenticationRejected indicate an issue with your Access Token.

Please note, you may need to change your code if you have added special handling for TVOErrorRegistrationError or TVOErrorConnectionError.

For more information see the API docs

The following is a summary of the new codes available for [TwilioVoice registerWithAccessToken:deviceToken:completion:], [TwilioVoice unregisterWithAccessToken:deviceToken:completion:]:

The following is a summary of the new codes available for [TwilioVoice connectWithOptions:delegate:], and [TVOCallInvite acceptWithOptions:delegate:]:

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0

April 25, 2019

• Programmable Voice iOS SDK 3.0.0 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

We have promoted 3.0.0-beta13 to 3.0.0. Reference our migration guide to upgrade your applications to 3.0.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta13

April 18, 2019

• Programmable Voice iOS SDK 3.0.0-beta13 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-5982 Fixed a bug where call quality warnings might be sent to Insights multiple times before the warning is cleared.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta12

April 17, 2019

• Programmable Voice iOS SDK 3.0.0-beta12 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• CLIENT-5973 Removed TVOErrorConnectionTimeoutError, TVOErrorSignalingConnectionError, TVOErrorSignalingConnectionTimeoutError, TVOErrorSignalingIncomingMessageInvalidError, TVOErrorSignalingOutgoingMessageInvalidError, TVOErrorConfigurationAcquireFailedError and TVOErrorConfigurationAcquireTurnFailedError from TVOError.h.

Bug Fixes

• CLIENT-5935 Fixed a bug where constant audio level warning events are being sent to Insights when the call is muted or onhold.
• CLIENT-5969 Renamed kDefaultAVAudioSessionConfigurationBlock to kTVODefaultAVAudioSessionConfigurationBlock so that TwilioVoice.framework and TwilioVideo.framework may be used in the same application.
• CLIENT-5977 Fixed a bug where the SDK was sending double values for packets_lost_fraction to Insights instead of integer.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta11

April 4, 2019

• Programmable Voice iOS SDK 3.0.0-beta11 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• CLIENT-5379 Added network reachability monitoring for the signaling socket for a reliable network change detection.

Bug Fixes

• CLIENT-5379 Fixed a bug where WiFi to WiFi network hand off was causing one-way audio followed by Call disconnect.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta10

April 2, 2019

• Programmable Voice iOS SDK 3.0.0-beta10 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-5828, CLIENT-5868 A network change that occurs during a reconnection will now trigger another reconnection attempt ensuring media is restored on the correct network.
• CLIENT-5882 Call metrics insights will always be available after a network handover when the call is in TVOCallStateConnected state.

Known Issues

• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta9

March 27, 2019

• Programmable Voice iOS SDK 3.0.0-beta9 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• CLIENT-5806 CLIENT-5807 Updated the API documentation for [TVOCallInvite acceptWithDelegate:] and [TVOCallInvite acceptWithOptions:delegate:].
• CLIENT-5810 Updated the API documentation for TVOCall.

API Changes

• Attempts to connect a Call via [TwilioVoice connectWithDelegate:] or [TVOCallInvite acceptWithDelegate:] that fail prior to reaching the TVOCallStateConnected state will always result in the call:didFailToConnectWithError: callback with an error code. However, if [TVOCall disconnect] is called while an attempt to connect or accept a call is made, the call:didDisconnectWithError: callback will be raised with no error.

Bug Fixes

• CLIENT-5813 Network loss scenarios that resulted in a Call failure now raise the call:didFailToConnectWithError: callback. Previously these scenarios erroneously raised call:didDisconnectWithError:.
• CLIENT-5754 A Call that fails as a result of not establishing a media connection prior to being connected now raises the call:didFailToConnectWithError: callback. Previously this scenario erroneously raised call:didDisconnectWithError:.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is correctly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.

Known Issues

• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta8

March 20, 2019

• Programmable Voice iOS SDK 3.0.0-beta8 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-5796 Fixed an issue where the millisecond timestamp in the Insights event payload overflows on 32-bit architecture devices.
• CLIENT-5830 Removed scripts from TwilioVoice.framework that could cause code signing issue when uploading apps to iTunes Connect.

Known Issues

• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta7

March 19, 2019

• Programmable Voice iOS SDK 3.0.0-beta7 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API Changes

• The from property of the TVOCallInvite and TVOCancelledCallInvite objects is now nullable in case the value is not available in the call invite notification.

Bug Fixes

• CLIENT-5801 Fixed an issue where an incoming call invite that did not contain a from field was not considered a valid notification.

Known Issues

• CLIENT-5830 Apps using 3.0.0-beta7 may have code signing issue when uploading to iTunes Connect due to some development scripts included in TwilioVoice.framework.
• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta6

March 14, 2019

• Programmable Voice iOS SDK 3.0.0-beta6 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• CLIENT-5258 Reduced SDK size by stripping video software codecs.
• CLIENT-5353 Reduced SDK size by stripping SCTP data channels.

Known Issues

• CLIENT-5830 Apps using 3.0.0-beta6 may have code signing issue when uploading to iTunes Connect due to some development scripts included in TwilioVoice.framework.
• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta5

March 4, 2019

• Programmable Voice iOS SDK 3.0.0-beta5 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• CLIENT-5678 The size impact report now includes both armv7 and arm64 architectures.
• The libboringssl.a library is now separated and shipped alongside the static library libTwilioVoice.a. Add -lboringssl in the Other Linker Flags to link the SDK properly.

Bug Fixes

• CLIENT-5664 The static library libTwilioVoice.a is now properly linked with dependencies.

Known Issues

• CLIENT-5830 Apps using 3.0.0-beta5 may have code signing issue when uploading to iTunes Connect due to some development scripts included in TwilioVoice.framework.
• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta4

February 14, 2019

• Programmable Voice iOS SDK 3.0.0-beta4 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

API Changes

• TVOCallFeedbackScoreNoScore is replaced with TVOCallFeedbackScoreNotReported.

Known Issues

• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-5578 WiFi to WiFi handover may disconnect the Call.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta3

February 7, 2019

• Programmable Voice iOS SDK 3.0.0-beta3 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• The Voice SDK publishes Call Insights. Publishing is enabled by default. The preference can be updated by configuring TVOCallOptions.enableInsights.
• CLIENT-5595 Added TVOErrorTokenAuthenticationRejected (51007). This error is raised when attempting to perform registration or unregistration with a token that is invalid.
• Added [TVOCall postFeedback:issue:] method to TVOCall that posts the feedback collected for this Call to Twilio. If TVOCallFeedbackScoreNoScore and TVOCallFeedbackIssueNotReported are passed, Twilio will report feedback was not available for this call.
• CLIENT-2985 The SDK can connect to Twilio’s Servers in an IPv6 environment.
• CLIENT-4998 Call will continue after network handoff.

Bug Fixes

• CLIENT-5573 Fixed a crash that occurred when a client issued a disconnect while already processing a termination request from the server.

Known Issues

• CLIENT-5576 LTE -> WiFi may cause one way audio.
• CLIENT-5578 WiFi to WiFi handover may disconnect the Call.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-5821 The packets_lost_fraction value reported to Insights is incorrectly computed and within the expect range of 0 to 100.
• CLIENT-5835 Events were erroneously reported to Insights when the TVOConnectOptions.enableInsights property was set to false.
• CLIENT-5882 Call metrics insights becomes unavailable after a network handover during a call.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta2

December 13, 2018

• Programmable Voice iOS SDK 3.0.0-beta2 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Added a preferredAudioCodecs property to TVOCallOptions. Support for Opus is added to the Voice SDK but yet to be enabled on Twilio infrastructure. It will be notified to the users of the Voice SDK when Opus codec is enabled on Twilio infrastructure.
• Added new error code 31008. This error is raised when a TVOCallInvite is accepted after the Call has ended.

Bug Fixes

• CLIENT-5398 Unmuting a Call on hold causes audio to flow.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4547 Insights is not published.
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

Size Report

3.0.0-beta1

November 26, 2018

• Programmable Voice iOS SDK 3.0.0-beta1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Added media and signaling related error codes.

Known Issues

• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5258 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4547 Insights is not published.
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• CLIENT-5398 Unmuting a call on hold causes audio to flow.
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

3.0.0-preview5

October 24, 2018

• Programmable Voice iOS SDK 3.0.0-preview5 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-5186 Fixed a crash when network is lost during an active Call.
• CLIENT-5132 The call:didDisconnectWithError: delegate method of the caller should be called with nil error instead of call:didFailToConnectWithError: when the TVOCallInvite is rejected with answerOnBridge enabled.
• CLIENT-4837 Fixed a crash caused by SIGPIPE when a signaling socket is closed due to an error.

Known Issues

• CLIENT-5059 Calls made to a client or PSTN number that have a long duration before answering may not get connected.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5258 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4547 Insights is not published.
• CLIENT-4672 CLIENT-4673 Error codes 20157 and 20151 report different message and explanation text than Voice 2.0 SDKs.
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

3.0.0-preview4

October 2, 2018

• Programmable Voice iOS SDK 3.0.0-preview4 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Enhancements

• Added customParameters property to TVOCallInvite.

Pass custom parameters in TwiML

  <?xml version="1.0" encoding="UTF-8"?>
  <Response>
    <Dial callerId="client:alice">
      <Client>
        <Identity>bob</Identity>
        <Parameter name="caller_first_name" value="alice" />
        <Parameter name="caller_last_name" value="smith" />
      </Client>
    </Dial>
  </Response>

callInvite.customParameters:

  {
    "caller_first_name" = "alice";
    "caller_last_name" = "smith";
  }

Bug Fixes

• CLIENT-5202 Fixed a potential crash caused by a memory corruption when a custom TVOAudioDevice is created.
• CLIENT-5160 The Voice SDK is built using the audio variant of WebRTC 67. Developers are no longer are required to add NSCameraUsageDescription key in app's Info.plist to consume the Voice SDK in an app and upload it to the App Store. #164
• CLIENT-5204 Call audio was not able to recover from AVAudioSession interruptions. TVOAVAudioSessionConfigurationBlock now configures AVAudioSession.preferredIOBufferDuration to 20 milliseconds by default, to match changes in WebRTC.

Known Issues

• CLIENT-5059 Calls made to a PSTN number may not get connected when answerOnBridge is set to true.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio's Network Traversal Service.
• CLIENT-5258 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4547 Insights is not published.
• CLIENT-4672 CLIENT-4673 Error codes 20157 and 20151 report different message and explanation text than Voice 2.0 SDKs.
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

3.0.0-preview3

September 12, 2018

• Programmable Voice iOS SDK 3.0.0-preview3 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs].

Bug Fixes

• CLIENT-5101 The inject_credentials.sh which was accidentally included in the TwilioVoice.framework bundle has been removed.

Enhancements

• This release is based on Chromium WebRTC 67.
• Provide a stateless mechanism for processing push notifications related to call invites and call invite cancellations. The [TwilioVoice handleNotification:] no longer raises errors via the notificationError: method when processing invalid notifications, instead a BOOL value is returned when it is called. The boolean value is YES when the provided notification payload results in a TVOCallInvite or TVOCancelledCallInvite object. If [TwilioVoice handleNotification:] returns NO it means the data provided was not a Twilio Voice push notification. The TVOCallInvite has an accept() and a reject() method. While the TVOCancelledCallInvite simply provides the to, from, and callSid fields also available in the TVOCallInvite object. The callSid can be used to associate a TVOCallInvite with a TVOCancelledCallInvite.
• notificationError: is removed from the TVONotificationDelegate protocol. cancelledCallInviteReceived: is added for the SDK to notify the application when a Call cancellation notification is received.

Processing push notifications in 2.X

- (void)pushRegistry:(PKPushRegistry *)registry
        didReceiveIncomingPushWithPayload:(PKPushPayload *)payload
             forType:(NSString *)type {
    [TwilioVoice handleNotification:payload.dictionaryPayload delegate:self];
}

#pragma mark - TVONotificationDelegate

- (void)callInviteReceived:(TVOCallInvite *)callInvite {
    if (callInvite.state == TVOCallInviteStatePending) {
        [self handleCallInviteReceived:callInvite];
    } else if (callInvite.state == TVOCallInviteStateCanceled) {
        [self handleCallInviteCanceled:callInvite];
    }
}

- (void)notificationError:(NSError *)error {
    NSLog(@"Failed processing notification payload: %@", error);
}

- (void)handleCallInviteReceived:(TVOCallInvite *)callInvite {
    // Call invite received
}

- (void)handleCallInviteCanceled:(TVOCallInvite *)callInvite {
    // Call invite canceled
}

Processing push notifications in 3.X

- (void)pushRegistry:(PKPushRegistry *)registry
        didReceiveIncomingPushWithPayload:(PKPushPayload *)payload
             forType:(NSString *)type {
    BOOL result = [TwilioVoice handleNotification:payload.dictionaryPayload delegate:self];
    if (!result) {
        NSLog(@"The processed data was not a Twilio push notification payload");
    }
}

#pragma mark - TVONotificationDelegate

- (void)callInviteReceived:(TVOCallInvite *)callInvite {
    // Call invite received
}

- (void)cancelledCallInviteReceived:(TVOCancelledCallInvite *)cancelledCallInvite {
    // Call invite cancelled
}

API Changes

• Deprecated the TVOAudioOptions.levelControl and TVOAudioOptions.levelControlInitialPeakLevelDBFS properties as they are no longer supported in Chromium WebRTC 67.

Known Issues

• CLIENT-5121 The apps using 3.0.0-preview3 may need to include NSCameraUsageDescription key and purpose string in it's Info.plist in order to submit the app to the App Store. The WebRTC used by the Twilio Voice SDK is using camera APIs. We are working on building the Voice SDK with the audio only variant of WebRTC where this workaround will not be required. #163
• CLIENT-5059 Calls made to a client or PSTN number that have a long duration before answering may not get connected.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio Network Travarsal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4698 Params that are passed to your TwiML Application while making calls are not URL encoded
• CLIENT-4547 Insights is not published
• CLIENT-4672 CLIENT-4673 Error codes 20157 and 20151 report different message and explanation text than Voice 2.0 SDKs
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

3.0.0-preview2

August 28, 2018

• Programmable Voice iOS SDK 3.0.0-preview2 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs]

Enhancements

• Introduced a new callback method [TVOCallDelegate callDidStartRinging:]. This callback is emitted once before the [TVOCallDelegate callDidConnect:] callback when the callee is being alerted of a Call. The duration of the TVOCallStateRinging is determined by the answerOnBridge flag provided in the Dial verb of your TwiML application associated with this client. If the answerOnBridge flag is false, which is the default, the [TVOCallDelegate callDidConnect:] callback will be emitted immediately after [TVOCallDelegate callDidStartRinging:]. If the answerOnBridge flag is true this will cause the Call to emit the callDidConnect callback only until the call is answered. See answeronbridge for more details on how to use it with the Dial TwiML verb. If the twiML response contains a Say verb, then the call will emit the [TVOCallDelegate callDidConnect:] callback immediately after [TVOCallDelegate callDidStartRinging:] is raised, irrespective of the value of answerOnBridge being set to true or false.
• Added a new Call state TVOCallStateRinging.
• TwilioVoice.region is moved to TVOCallOptions.region.
• Added a getStatsWithBlock: method to TVOCall that builds a TVOStatsReport with metrics for all the audio tracks in a Call.

Known Issues

• CLIENT-5121 The apps using 3.0.0-preview2 may need to include NSCameraUsageDescription key and purpose string in it's Info.plist in order to submit the app to the App Store. The WebRTC used by the Twilio Voice SDK is using camera APIs. We are working on building the Voice SDK with the audio only variant of WebRTC where this workaround will not be required. #163
• CLIENT-5059 Calls made to a client or PSTN number that have a long duration before answering may not get connected.
• CLIENT-4943 Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio Network Travarsal Service.
• CLIENT-4805 The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• CLIENT-4998 Network handoff, and subsequent connection renegotiation is not supported.
• CLIENT-2985 IPv6 is not supported.
• CLIENT-4698 Params that are passed to your TwiML Application while making calls are not URL encoded
• CLIENT-4547 Insights is not published
• CLIENT-4672 CLIENT-4673 Error codes 20157 and 20151 report different message and explanation text than Voice 2.0 SDKs
• CLIENT-4537 PCMU is the only supported codec. We plan on adding support for Opus moving forward. #117
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

3.0.0-preview1

August 10, 2018

• Programmable Voice iOS SDK 3.0.0-preview1 [Carthage], [Cocoapods], [Dynamic Framework], [Static Library], [docs]

This is our first WebRTC based release using Chromium WebRTC 57.

This SDK introduces audio device APIs. The Voice SDK uses TVODefaultAudioDevice by default. This release intruduces a new protocol, TVOAudioDevice. This protocol gives you the ability to replace TVODefaultAudioDevice. By implementing the TVOAudioDevice protocol, you can write your own audio capturer to feed audio samples to the Voice SDK and an audio renderer to receive the remote audio samples. For example, you could integrate with ReplayKit2 and capture application audio for broadcast or play music using AVAssetReader.

This SDK introduces TVOConnectOptions and TVOAcceptOptions to allow developers to make behaviorial changes associated with a Call.

This SDK allows multiple active Calls to be managed by the application.

Enhancements

• Introduced TwilioVoice.audioDevice class property. You should set your audio device on TwilioVoice.audioDevice before performing any other actions with the SDK such as creating Tracks or connecting to a Call.
• Added TVODefaultAudioDevice to render and capture audio. By default, the Voice SDK uses TVODefaultAudioDevice to capture and render audio.
• Added the ability to provide your own audio capturing and rendering via the TVOAudioDevice protocol. As a part of this change we've also added TVOAudioFormat which describes audio that is being captured and rendered.
• This release deprecates CallKitIntegration category from TwilioVoice in favor of a new property called TVODefaultAudioDevice.enabled. This property provides developers with a mechanism to enable or disable the activation of the audio device prior to connecting to a Call or to stop or start the audio device while you are already connected to a Call. A Call can now be connected without activating the audio device by setting TVODefaultAudioDevice.enabled to NO and can be enabled during the lifecycle of the Call by setting TVODefaultAudioDevice.enabled to YES. The default value is YES. This API change was made to ensure full compatibility with CallKit as well as supporting other use cases where developers may need to disable the audio device during a call.

Examples #1 - Changing the audio route from receiver to the speaker in a live call:

// The Voice SDK uses TVODefaultAudioDevice by default.

// ... connect to a Call. The `TVODefaultAudioDevice` is configured to route audio to the receiver by default.

TVODefaultAudioDevice *audioDevice = (TVODefaultAudioDevice *)TwilioVoice.audioDevice;

audioDevice.block =  ^ {
    // We will execute `kDefaultAVAudioSessionConfigurationBlock` first.
    kDefaultAVAudioSessionConfigurationBlock();

    if (![session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&error]) {
        NSLog(@"AVAudiosession overrideOutputAudioPort %@",error);
    }
};
audioDevice.block();

Example #2 - Connecting to a Call using the AVAudioSessionCategoryPlayback category:

id<TVOAudioDevice> audioDevice = [TVODefaultAudioDevice audioDeviceWithBlock:^ {

    // Execute the `kDefaultAVAudioSessionConfigurationBlock` first.
    kDefaultAVAudioSessionConfigurationBlock();

    // Overwrite the category to `playback`
    AVAudioSession *session = [AVAudioSession sharedInstance];
    NSError *error = nil;
    if (![session setCategory:AVAudioSessionCategoryPlayback
                         mode:AVAudioSessionModeVoiceChat
                      options:AVAudioSessionCategoryOptionAllowBluetooth
                        error:&error]) {
        NSLog(@"AVAudioSession setCategory:options:mode:error: %@",error);
    }
}];

TwilioVoice.audioDevice = audioDevice;

TVOCall *call = [TwilioVoice connectWithOptions:connectOptions delegate:self];

• Migrated the API to make an outbound Call from [TwilioVoice call] to [TwilioVoice connectWithOptions:delegate:].

TVOConnectOptions *connectOptions = [TVOConnectOptions optionsWithAccessToken:self.accessToken
                                                                       block:^(TVOConnectOptionsBuilder *builder) {
   builder.params = twiMLParams;
   builder.uuid = [NSUUID UUID];
}];
TVOCall *call = [TwilioVoice connectWithOptions:connectOptions delegate:self];

• Migrated the API to accept a TVOCallInvite using TVOAcceptOptions.

TVOAcceptOptions *options = [TVOAcceptOptions optionsWithCallInvite:self
   block:^(TVOAcceptOptionsBuilder *builder) {
   builder.uuid = weakSelf.callInvite.uuid;
}];
TVOCall *call = [callInvite acceptWithOptions:options delegate:strongSelf];

• Added standalone log modules: TVOLogModuleCore, TVOLogModulePlatform, TVOLogModuleSignaling and TVOLogModuleWebRTC.
• [TwilioVoice setModule:logLevel:] is now [TwilioVoice setLogLevel:module:].
• [TwilioVoice logLevelForModule:] is added for retrieving log level for specific module.
• [TwilioVoice version] is now [TwilioVoice getVersion] to avoid type conflict with NSObject.
• Voice iOS SDK 3.0.0 supports iOS 10.0 and later versions.

Known Issues

• CLIENT-5121 The apps using 3.0.0-preview1 may need to include NSCameraUsageDescription key and purpose string in it's Info.plist in order to submit the app to the App Store. The WebRTC used by the Twilio Voice SDK is using camera APIs. We are working on building the Voice SDK with the audio only variant of WebRTC where this workaround will not be required. #163
• CLIENT-5059 Calls made to a client or PSTN number that have a long duration before answering may not get connected.
• [CLIENT-4943] Restrictive networks may fail unless ICE servers are provided via TVOConnectOptions or TVOAcceptOptions. ICE servers can be obtained from Twilio Network Travarsal Service.
• [CLIENT-4805] The SDK size is significantly larger than 2.x. A reduced size will be introduced during the beta period.
• [CLIENT-4998] Network handoff, and subsequent connection renegotiation is not supported.
• [CLIENT-2985] IPv6 is not supported.
• [CLIENT-4698] Params that are passed to your TwiML Application while making calls are not URL encoded
• [CLIENT-4547] Insights is not published
• [CLIENT-4672] [CLIENT-4673] Error codes 20157 and 20151 report different message and explanation text than Voice 2.0 SDKs
• Using the Voice iOS SDK side by side with the WebRTC library will result in RTCNativeAudioSessionDelegateAdapter symbol conflict during compile time.

2.X

For older changelog entries including 2.x, click here