In the spring of 2007, we decided to change the project structure and licensing to reduce complexity and potential usage conflicts. Pingtel made a new contribution of code to SIPfoundry based on its previous commercial version to create the sipXecs project (see the change announcement).
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.
Commercial sponsor history
In July of 2007, Pingtel was acquired by Bluesocket, which in turn sold all the assets of Pingtel to Nortel in August of 2008. Nortel had already been selling a product (Software Communications System - SCS) based on code from the sipXecs project for some time. When Nortel bought the assets of Pingtel, they also hired all of the developers from Bluesocket.