Tracking development of pjsip, the Open Source SIP, media, and NAT traversal stack/SDK/library for Android, iOS, Windows, Linux, MacOS, RTOS, embedded, and pretty much anything, any device.
Also check PJSIP Documentation site.
Check out our new PJSIP FAQ. If you still got questions, there is always the mailing list.
Let me know if the FAQ fulfills your need (or not).
Here is where we talk about pjsip development in general, and maybe other stuff as well. For the project itself, please go to the main pjsip project website. or pjsip documentation.
PJSIP is backed by Teluu, which provides professional support, additional licensing options, and a network of qualified consultants.
pjsip blog 
One response to “Got Questions? We Got Answers”
How can I integrate a VBR codec to the pjsip application?