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Many of the developers who were focused on User Agents continued with those parts of the original code base as the sipXtapi project, and that project is very much alive and well.

This is why the sipXecs subversion numbers begin at 9999 - we didn't want the new project to overlap with the revision numbers with the old one.

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Note that nowhere in any of the above did the project name sipX appear. It The name sipX has been used as a sort of shorthand since the beginning, but is actually ambiguous (since there are two independent projects that both use that name prefix).

When creating documentation, please try to use the real name of the project: sipXecs (pronounced sip-eks-eksee cee es).

Commercial sponsor history

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As noted above, this project began with contributions from Pingtel. Pingtel began life focused on the development of VoIP phones, and quickly narrowed that focus to SIP phones. The Pingtel Expressa phone was considered one of the best SIP phones in the business at one time, and nearly every SIP interoperability lab had at least one for testing (some probably still do). It was, alas, not a commercial success, and Pingtel eventually shifted its focus to the SIPxchange PBX product and the accompanying open source projects as described above.

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Nortel greatly expanded the developer base and the features of both its SCS product and the sipXecs open source project. In January of 2009, Nortel declared bankruptcy; while in bankruptcy, development and contributions to the open source project continued, and in December of 2009, the commercial product was acquired by Avaya.

Avaya continues to actively support development of both the commercial version (still called SCS) and the sipXecs open source In March 0f 2010, Avaya stopped contributing to the source code to the community. Members of the community came together (including several of the original Pingtel employees under the company name eZuce, Inc.) and are now maintaining the project.