Freshmeat page: http://freshmeat.net/projects/vocal/
If you are interested in open source voice communications stuff, this is an excellent source. There are implementations co communication protocols applications built with them including stuff for SIP, MGCP, H.323, COPS, OSP, RTSP, VXML.
License: BSD like (http://www.vovida.org/About/license.html)
This project has the following developers:
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