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SIP posts

  • By Matt Coser
    SRTP and You: A Deep Dive into Encrypted VoIP Communications SRTP and You Hero

    RTP, or Real-time Transport Protocol, is used by Twilio (and others) for transmitting audio information for SIP calls. SRTP is Secure RTP, or RTP that has been encrypted. By design, no one can listen to, intercept, or replay the encrypted RTP media except the parties that originally negotiated the SIP session.

    In this post, we will discuss:

    • How SRTP Works
    • Why encrypted media is cool
    • Overcoming potential obstacles and overhead
    • How to set up SRTP with Twilio
    • Implementation considerations

    How does SRTP work?

    If you understand HTTPS, then you will totally get SRTP. If not, let’s start by reviewing the basics.

    SRTP employs TLS for encryption, which uses a ‘handshake’ that looks something like this:

    TLS handshake ladder diagram​​

    The client and server exchange keys, which are unique to the current session, and use them to encrypt/decrypt the data that is being transferred between them.

    SRTP uses Advanced Encryption Standard (AES) …

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  • By Bill Harrison
    Twilio and Sony Partner to Enable Voice Calling on Low-Power, LTE-M Cellular IoT Devices Embedded Voice over LTE-M

    Voice is still the preferred choice for people who want to communicate, and millions of developers already know how Twilio gives them the power to add voice communications to their products with just a few lines of code. These products, such as wearables, IoT, and smart devices are getting smaller and smaller and becoming more a part of our lives every day. Now with Sony Semiconductor and Twilio, you can quickly and easily add voice communications to your small-footprint, low-power, and low bandwidth IoT device. All you need is an ALT1250 chipset within your device, a SIP or WebRTC client and a microphone and speaker. This new capability means simplified design and reduced cost for portable, low-power IoT devices with global voice functionality.

    Meet us in person at Embedded World in Nürnberg, Germany, June 21-23 2022 for a live demo! Find us at the Sony Semicon booth in Hall …

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  • By Al Kiramoto
    Quickly Enable Your Employees to Work from Home Using Twilio Programmable Voice Enable WFH Quickly Hero

    If your PBX solution does not natively allow for remote working and you need to act fast, this solution is for you. This tutorial shows you how to create a solution with Twilio Programmable Voice and a SIP softphone software or an SIP IP Phone that enables employees to work from their homes.

    Configure the Programmable Voice SIP Endpoint

    You can forward incoming calls to Twilio numbers registered to SIP endpoints, and use a free softphone as an endpoint while working from home, as shown below:

    Flow for how employees can work from home using Twilio

    To get started with the project you will need the following:

    • A Twilio account. Sign up for a free trial account and get a $10 credit.
    • A call-enabled Twilio Phone Number.
    • SIP endpoint (IP Phones (e.g. Obihai) or Softphones (e.g. Zoiper or X-Lite)).

    Create the application

    Go to and sign up for a free account or log in to your existing account. …

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  • By Robert Welbourn
    Run a PBX on a Raspberry Pi with Twilio SIP Trunking 3CX Raspberry Pi Hero

    If you're a hobbyist, a tech-savvy small business owner, or even a curious solutions engineer, what could be more fun than running your own phone system? In this post I will show you how to do just that using a $100 Raspberry Pi 4 computer connected to a Twilio Elastic SIP trunk. I'm going to use the 3CX PBX (Public Branch eXchange) software, which is easy to administer and available as a free-to-use version for small deployments.

    Traditionally, a PBX has served to connect the telephone handsets in an organization with the public switched telephone network (PSTN), providing features such as an operator station, voicemail, call forwarding and so on. It would consist of a rack of equipment in a telephone closet, connected to the building wiring system, and administered by members of a technical priesthood. In contrast, this modern implementation with the Raspberry PI 4 can still work with …

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  • By Annie Benitez Pelaez
    7 Reasons to Adopt SIP Trunking in Your Contact Center ESIPT2.png

    If you haven’t already moved your contact center from PRI trunks to SIP trunks, it may be time to give it another look. That’s because several recent cloud-driven technology trends have made the case for SIP trunking even stronger. Putting SIP trunks in place could not only save money and increase agility, but also enable you to dramatically improve customer experiences.

    There are three major trends at work:

    1. Cloud-based natural language processing engines are enabling contact centers to deploy voicebots (aka virtual agents) that are less costly and offer better experiences than live agents. These services connect to the PSTN via SIP trunks.
    2. Cloud-based contact center as a service (CCaaS) is displacing on-premises infrastructure by offering more flexibility and better economics. Like voicebots, these services connect to the PSTN via SIP trunks.
    3. A new category of cloud-based SIP trunking services provide more flexibility and better geographic coverage than traditional telco-based …
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  • By Annie Benitez Pelaez
    Twilio Elastic SIP TrunkingとGenesys Cloud、絶賛連携中です! twilio-genesys-jp

    この記事は、プロダクト管理担当のAnnie B. Pelaezが、こちら(英語)で執筆した記事を日本語化したものです。

    Genesys Cloudサービスへの移行を計画しているコンタクトセンターのマネージャーやアーキテクトは、それまであまり考えたことがないような重要な検討を迫られます。お客様をGenesys Cloudにどのように接続するのがベストかという検討事項です。Genesys Cloudの利用企業には大きく3種類のPSTN(公衆電話網)接続オプションがあり、そのそれぞれにおいて、事業のアジリティ、コスト、顧客体験などの要因に影響するトレードオフの状況に遭遇します。

    Genesys Cloudでは、 “Bring Your Own Carrier (BYOC)” アプローチを提供しており、企業はGenesys Cloudの音声サービスをビジネスニーズに応じて柔軟に選択することができます。TwilioをはじめとするサードパーティプロバイダのグローバルなSIPトランクサービスを活用し、地理的なカバー範囲、価格、柔軟性などのメリットを享受することができます。

    Genesys Cloudのネイティブボイスサービス 〜 デプロイメント面での柔軟性

    Genesys Cloud Voiceサービスは、ワンストップショップによる簡素化を提供します。DIDやフリーダイヤルといった電話番号を購入したり、PSTNサービスを有効にすることが、Genesys Cloudの管理ポータル上で簡単に行えます。また、サードパーティのサービスプロバイダから番号移行することもできます。 …

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  • By Arvind Rangarajan
    5 Ways to Save Money with Twilio Elastic SIP Trunking Elastic SIP Trunking Save Money Hero

    Who doesn’t like to save money? Telecommunications costs can consume a substantial portion of an organization’s budget, siphoning funds from other projects. By taking a close look at the way your organization connects its many communications applications to the public switched telephone network (PSTN), you may be able free up money to invest in strategic initiatives.

    Twilio Elastic SIP Trunking is designed to help you save money. We’ve taken a comprehensive approach to cost efficiency by building a SIP trunking service that reduces soft and hard costs.

    In this blog post, we’ll analyze the costs associated with connecting communications applications to the PSTN, and highlight five ways that Twilio Elastic SIP Trunking can put more money into your strategic projects budget. We will focus on the economic differences between Twilio Elastic SIP Trunking and the services offered by traditional telecommunication providers.

    Optimizing global PSTN trunking costs

    Optimizing PSTN connectivity costs …

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  • By Quinn Hare
    SHAKEN/STIR – What do you need to do to ensure your calls get answered? SHAKEN/STIR Calls Answered

    In this post, we’ll go over what SHAKEN/STIR is, its importance, and how to get started.

    What is the problem that is being solved with SHAKEN/STIR?

    Consumers don’t answer the phone anymore because the public telephone network has been flooded by Spam and robocalls. This is making it harder than ever for businesses to engage with their customers. In 2019 alone, over 50 billion robocalls in the United States eroded trust in the telephone network and led to a drop in call answer rates from unidentified numbers! SHAKEN/STIR is here to combat this problem.

    What is SHAKEN/STIR?

    SHAKEN/STIR is a caller authentication framework meant to help restore trust by reducing fraudulent robocalls and illegal phone number spoofing. SHAKEN stands for Signature-based Handling of Asserted information using toKENs, and STIR stands for Secure Telephone Identity Revisited. They are standards developed by ATIS and the IETF respectively.

    Twilio Signing Policy

    In a …

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  • By Quinn Hare
    SHAKEN/STIR – Que faire pour vous assurer que l'on réponde à vos appels ? SHAKEN/STIR – Que faire pour vous assurer que l'on réponde à vos appels ?

    Dans cet article, nous passerons en revue ce qu’est SHAKEN/STIR, son importance, et comment se lancer.

    Quel problème résout-on avec SHAKEN/STIR ?

    Les consommateurs ne répondent plus au téléphone car le réseau de téléphone public s’est vu inondé de spams et d’appels de bots. Cela rend la tâche plus compliquée pour les entreprises qui veulent entrer en contact avec leurs clients. Rien qu’en 2019, plus 50 milliards d’appels de bots ont effrité la confiance dans le réseau de téléphonie fixe aux Etats-Unis et ont mené à une chute du taux de réponse aux appels des numéros non-identifiés. SHAKEN/STIR est là pour combattre ce problème.

    Qu’est-ce que SHAKEN/STIR?

    SHAKEN/STIR est un framework d’authentification d’appelants, destiné à aider à restaurer la confiance en réduisant les appels de bots et les usurpations illégales de numéros de téléphones. SHAKEN signifie Signature-based Handling of Asserted information using toKENs (Gestion des informations affirmées via une signature …

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  • By Annie Benitez Pelaez
    Twilio Elastic SIP Trunking、多種多様な外部サービスとの連携でご活用いただけます Elastic SIP Trunking Momentum Header JP


    Twilio Elastic SIP Trunking製品ラインは、2020年を通し順調に推移し、主要なビジネス指標すべてにおいて前年を大きく上回りました。この結果は、Twilioの目指す方向が正しいことを証明しています。具体的には、革新的なSIPトランキングサービスをクラウド上に構築することにより、お客様のビジネスを迅速化し、世界中からアクセス可能なPSTN接続を整備し、コストを大幅に削減することです。

    TMC、Eastern Management Group、Omdiaなど、著名な第三者機関からも、当社の業績は高く評価されています。一方で、もっとも喜ばしいことは、TwilioのPSTN接続サービスを多くのお客様から信頼いただいていることだと考えています。


    Twilio Elastic SIP Trunkingの数多くの利点が、お客様に広く認知されるようになりました。Twilioの顧客数は、3年連続で2桁増を記録しています。ご利用企業の増加は、PSTN接続サービスの世界的なニーズの高まりを示しています。具体的には、コンタクトセンター、ユニファイドコミュニケーション、事業プロセスやウェブアプリケーションへの音声通話機能の組み込みなどです。

    先日発表した2件のお客様事例をご紹介しましょう。Ozonetel様は、Twilio Elastic SIP Trunkingを採用し、クラウドベースのコンタクトセンターサービスの強化を目指しました。1,500社以上の顧客企業に、信頼性の高いPSTN接続を提供 …

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