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Voxeo Announces Tropo: The Open Source Cloud Telephony Service

July 27
11:44 2009

Web HostingSan Jose, CA – At the O’Reilly Open Source Convention (OSCON), Voxeo, a leading provider of Unified Communications and Self-Service platforms, announced that the cloud telephony service source code will be made available to developers for free under open-source licenses. The new Tropo source release demonstrates that cloud computing vendors can subscribe fully to open-source ideals, and avoid the proprietary lock-in typically found in cloud services. Tropo is the first of several new open-source projects from Voxeo Labs, the innovation and open-source focused organization announced by Voxeo yesterday at OSCON. provides a cloud telephony service that enables developers to write voice applications in popular programming languages including Groovy, JavaScript, PHP, Python and Ruby. This approach stands in contrast to XML-centered options that have historically been the only option for cloud telephony services. Tropo applications can be written comfortably and directly in supported languages, with no need for inefficient intermediary translation to and from XML formats. Applications built on Tropo can answer and place calls via traditional landline phones, mobile phones, corporate PBXs and newer IP-based solutions such as SIP and Skype. In addition to being open-source, the Tropo platform is built entirely on open standards including SIP, Java SIP Servlets, and the IETF’s Media Resource Control Protocol (MRCP).

[swfobj src=”” width=”300/250″ class=”border: 1px solid grey;” align=”right”] “Since 1999, Voxeo’s core mission has been to make telephony easy, effective and free of lock-in. We’ve been tearing down the walled gardens of telecom and replacing them with an open and accessible environment,” said Jonathan Taylor, CEO of Voxeo. “Nothing demonstrates this commitment better than Tropo’s completely open standards foundation and open-source availability. Unlike cloud vendors that use open-source but offer little back to the open-source community, we’re showing how cloud computing can be both completely open for end customers and concretely beneficial to open-source developers.”

The Tropo source code released today includes:

* Tropo SIP Servlet, which implements the Tropo core Java API for telephony applications and a mechanism to host a wide variety of programming languages on top of that API. The Tropo SIP Servlet is built on the Java SIP Servlet standard, JSR-289. SIP Servlet platforms are available from many vendors including Voxeo, Oracle, Avaya, and Redhat. The Tropo SIP Servlet uses another standard, the IETF’s MRCP standard to control audio interaction during calls. By open-sourcing this technology, Voxeo hopes to support a wider variety of MRCP servers, and ultimately support any media platform that implements the Java Media Server Control API, JSR-309.
* Tropo “Shims” for Groovy, JavaScript, Python, PHP, and Ruby programming languages. Tropo Shims adapt the Tropo core API for use in a specific programming language. Open-sourcing these components enables Tropo to quickly support other programming languages. By releasing this code and working with the open-source telephony community, Voxeo hopes to add support for additional programming languages such as Clojure, JavaFX, and Scala.

Over the coming weeks, Voxeo Labs will release additional Tropo components that will allow developers to run their own Tropo applications in private clouds, elastic computing services, or their own servers in conjunction with Voxeo’s free Prophecy platform. Over the coming months, Voxeo Labs will work to support the widest variety of SIP Servlet and media server platforms, giving telephony application developers a simple yet powerful telephony API that works across the widest variety of platforms and vendors.

“Ultimately our goal is to make Tropo the open, cross-vendor foundation for frameworks such as Adhearsion and others,” stated Jason Goecke, VP of Innovation at Voxeo Labs. “We look forward to fostering an open-source community that will give developers greater choice, including the option to deploy their own cloud services.”

The Tropo platform source code is hosted on Github and is available immediately. Voxeo invites the developer community to join in building an open cloud telephony platform at

For more information please visit Voxeo Labs at

About Voxeo
Voxeo makes Unified Communications and Self-Service applications easy to build and deploy. The company’s common sense approach isn’t rocket science: Create exceptionally great products. Make them exceedingly easy to try, buy and use. Deliver them with extreme support. This approach has made Voxeo the leading choice for enterprises and developers that prefer powerful simplicity where expensive complexity once reigned. More than 45,000 customers – including half of the Fortune 100 – use Voxeo’s SIP-powered products and services to deliver innovative IVR, VoIP, outbound notification, and unified communications solutions. All of Voxeo’s products and services are available for free development and trial use at

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