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.
Version 1.8.5 is released, containing some bug fixes and incremental enhancements from previous releases. Please see the Download page as usual 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 “Version 1.8.5 is released”
Hey friend!
I am a layman to PJSIP in Taiwan.
could you help me how to integrate RTL-8954C with pjsip.
i just want to know is this idea possible?
The RTL-8954C is from Realtek in Taiwan.
And please help me if it’s possible.
I am in an impasse now…