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.
PJSIP version 2.1 is released with primary focus on BB10 and support for SILK and OpenCore AMR-WB codecs. We also managed to fix synchronization issues in PJNATH and last but not least, the release also contains bug fixes and improved interoperability after SIPit 30 testing in North Carolina just a couple of weeks ago.
As usual please see the Download page for more info.
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 “PJSIP version 2.1 is released with support for BB10, SILK, and OpenCore AMR-WB”
great! wait for a long long time.