With Twilio’s Programmable Voice SDKs for iOS and Android, you can easily build engaging and high quality voice calling experiences into your Apps. Whether it is calling a phone number (PSTN), another App user (VoIP), or your contact center, you can bring a contextual and secure calling experience to your users directly from your App.

We are thrilled to announce that our latest version of Programmable Voice Mobile SDKs, 3.0, is now generally available. With 3.0, you can make your customer call experiences even more engaging: with improved audio quality, increased efficiency, and contextual calling. This release includes features such as support for Opus codec, call control functions, and custom parameters.

We will walk you through the advantages of using Mobile VoIP with some common use cases, what new features rolled out with 3.0, and explain how to get started and/or migrate to Twilio Programmable ...

In my last blog post, Registering a SIP Phone Directly to Twilio (and so much more...), we set up a Twilio Programmable Voice SIP Domain and registered our SIP softphones directly to Twilio. This let us place and receive calls to the Public Switched Telephone Network (PSTN) but more importantly, set up the foundation for building creative applications which intelligently route calls using dynamically returned Twilio Markup Language (TwiML).

In this post we’ll provide a step-by-step approach to connect your SIP element – IP-PBX, SIP-PRI IAD, SBC, etc. – to Twilio’s Elastic SIP Trunking product. By the end of this post, you’ll have your existing communications infrastructure connected through Twilio and ready to layer on a number of Twilio’s other features.

At its most basic level, Twilio Elastic SIP trunking provides dynamic trunking capacity to place and receive pay-as-you-go phone calls through Twilio. Twilio’s network spans a ...

There are a number of ways to record calls with Twilio. Whichever method you decide to use, it is very important to keep the storage space used below the chargeable limit to prevent added cost. To achieve this, you need to backup up and delete your voice recording occasionally. Storage over 10,000 minutes per project is billed by the minute, once a month.

In this tutorial, we are going to discuss how to automate recordings management with recording status callback, download recordings programmatically via the REST API, save the recordings in Dropbox and finally delete the recordings programmatically via the REST API.

Prerequisites

You will need the following technologies and tools:

• Twilio Account
• Dropbox account
• Composer globally installed
• Ngrok
• PHP development environment Laravel

To follow along, you should have a basic understanding of PHP. Knowledge of the Laravel framework is not required. You can choose to use any other ...

How can I play a Youtube video over WebRTC?
Is there a way to play dynamic audio over a Twilio Voice call?

Many people have asked about playing dynamic audio over the phone using Twilio. And while TwiML does allow you to create dynamic templates based on user input, it doesn’t help me if I want to start and stop audio or play a video over the phone. I could imagine some enterprising person using these powers to prank the robocallers, spammers and even the occasional pesky family member. In this post, we are going to look at one quick way to inject any MediaStream into a phone call using the WebRTC-based Twilio Client SDK.

Prerequisite: This post starts off at the very end of the Twilio Client quickstart, so if you haven’t completed that it is recommended you do so now. Of course, these concepts could be ...

At times, you might want to create an app that uses a phone number/password pair as a means of authentication, as opposed to the normal email/password pair. In some other cases, you are not necessarily using phone numbers as a means of authentication, but having a phone number is critical to your app. In such situations, it is very important you verify that the phone numbers your users provide are valid and functional. One way to do this is to give them a call and tell them a code that they will have to provide to your app. If you use Gmail, then you are probably familiar with the voice call verification it uses. In this article, I will be showing you how to achieve that using Laravel and Twilio’s excellent service. Let’s get to it.

Technical Requirements

For this tutorial we’ll assume the following ...

“Please listen carefully, as our menu options have changed.”

Yikes!

It is rare that I find myself memorizing a company’s IVR options. It is much more common for me to repeat "Representative" into the phone and press the 0 key until something works.

As a small business owner, I find most IVRs to be out of touch with reality. While I want to engage my customers 24/7/365, I don’t want to make their lives difficult. I recently had an experience with an airline call center that allowed me to take control of my reservation without ever speaking to a representative.

As a developer and Twilio fan, I began writing pseudo-code in my head of how I could build a simple call center that would not only give my customers a personalized self-service portal, but would also allow for my employees to focus their time on more ...

Call tracking involves saving a phone number and recording related the information about the calls made by that number. The metrics can then be used to measure the impact of marketing efforts on lead generation and sales.

Say that you are an entrepreneur or the marketing head of an organization and your main source of leads are phone calls. To spend your marketing dollars wisely, you will have to know which of your campaigns generate the maximum number of calls. This can be done using a call tracking system.

Call tracking systems used to be very expensive and cumbersome. However, in this blog post we will create an easy call tracking system that combines the powers of Twilio and Google Analytics to give you a very detailed picture of the calls and locations of these calls.

Configuring Google Analytics

Start by logging into your Google Analytics account or signing up ...

Imagine you are driving along in your car and your phone beeps, letting you know that a text message has come in.  We all know it’s beyond dangerous to read a message whilst driving, it’s a pet hate of mine when I see people doing it, so why not get your text message phoned through to you? Hands-free, of course!

This post will show you how to create talking texts using Twilio, .NET Core, Cognitive Services and Azure Storage.

We will build an application that will convert incoming SMS into speech using the Speech Service, currently in preview, on Microsoft Cognitive Services.  We will then use Twilio to call your mobile and play the speech recording.

Let’s get started.

What you will need

• .NET Core 2.1 SDK (version 2.1.300 or greater)
• Azure Storage Account with a blob - set the access policy on your blob ...

Access to customer context is key to a great customer experience in voice and messaging flows. As it lets you customize your interactions specific to that customer and address their needs promptly.

In this blog post, we will walk through the steps involved in connecting to Salesforce CRM database with Twilio Studio. This means, that when a customer calls into your contact center, in realtime, we can ask the CRM for more details about the caller based on their phone number.  With this additional context, we can present an IVR tailored to their needs or use that information to intelligently route their call.

Before we get started, if you haven’t yet used Studio, I recommend taking a look at this getting started with Studio guide.

Flows in Studio are built with widgets which is a state or transition in our flow. In this post we will mainly use the ...

If you’re running a multi-site Contact Center and you need to transfer a call from one agent to another agent in a different location, you can now send Twilio a SIP REFER message requesting that transfer.

About call transfers

A call transfer is just what it sounds like: It’s when you transfer a customer’s call from one call center agent to another. You might need to initiate a call transfer for several reasons, such as when a customer requesting to speak to the manager. Quick, easy call transfers are a necessary function in today’s business telecom environments.

When an agent presses the “Transfer” button on a SIP-enabled IP phone, the phone issues a SIP REFER method requesting the call to be transferred to a third party using the contact information provided in the request.

A very common type of call transfers is “blind” transfers. Blind transfers ...