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AT&T VoIP client for Webex (VOC)


AT&T Business offers a range of voice, VoIP, contact center, conferencing and collaboration solutions and API technology designed to keep customer’s business connected.



AT&T provides its customers with a Webex Conferencing service integrated with its telephony infrastructure. The original integration between the Webex client and AT&T telephony infrastructure used a legacy technology, which the company wanted to replace by a more modern solution with enhanced security mechanisms.

The product team in AT&T had an extremely short time to develop and deploy a new VoIP client, which will integrate into the Webex client and will allow VoIP calls using modern, standard, and secured technologies (SIP over TLS, SRTP).

Taking into account the importance and the urgency of the project, the company decided to implement the solution together with its reliable and trusted partner for mission-critical projects – Sogo Services.



Through the project, Sogo had complete ownership of the product design and implementation. This included the software architecture, security architecture of the solution as well as the full product development lifecycle.

The development process followed agile methodology with an emphasis on frequent communication with the customer. Sogo team conducted periodical demos to AT&T stakeholders, participated in architecture discussions and security reviews.

The development source code fully adheres to the code quality and security standards of AT&T and has been transferred to the AT&T development team upon completion of the project.



Sogo team was able to meet the extremely tight deadlines and deliver the solution based on the budget and quality requirements while adapting to the architectural and functionality requirements changes throughout the project.

The Sogo team completed the design and the development of a VoIP client for Cisco WebEx, which allows connecting to the Webex Meeting using AT&T SIP/VOIP infrastructure.

The service included the development of VoIP plugin for Microsoft Windows, integration with WebEx Meeting Client using TSP Client SDK, providing a demonstration at pre-set stages of development, documentation, unit testing, and knowledge transfer.

AT&T is the world's largest telecommunications company


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“I’ve been working with Sogo for the last year and half.
During this time, we outsourced a lot of our software development to Sogo, in various domains as architecture, security, backend and front end development. I’ve found Sogo to be very professional in their deliveries. They have always lived up to their commitments, delivered on time, with good quality and modern engineering practices.
I will be happy to continue working with Sogo and recommend it to whom It may concern.”
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