https://www.pjsip.org/
PJSIP - Open Source SIP, Media, and NAT Traversal Library
Professionally supported open source, portable, small footprint multimedia communication libraries written in C language for building portable VoIP...
open sourcesip medianat traversalpjsiplibrary
https://issues-archive.asterisk.org/ASTERISK-24499
ASTERISK-24499: Need more explicit debug when PJSIP dialstring is invalid
need moreasteriskexplicit
https://lists.digium.com/pipermail/asterisk-users/2020-April/294783.html
[asterisk-users] PJSIP Lockup
asteriskuserspjsiplockup