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.
pjsip blog 
great! wait for a long long time.