Im working on two different PCs - one PC with linux OS and second PC with winXP 32bit. And I able to establish SIP and RTP call but I can NOT see any notification about this SIP/RTP call from PJSIPSUA server perspective on winXP machine (Im calling from linux machine using cmd: ./pjsua-i686-pc-linux-gnu sip:30.10.31.28 --add-codec=gsm --local-port=4010 --bound-addr=184.1.1.2 --auto-answer=200 --auto-loop and on WinXP (server) machine cmd looks like: D:\Automation\PJSIP>pjsua-i386-Win32-vc8-Release-Static.exe --local-port=4010 --id=sip:localhost --bound-addr=30.10.31.28 And I can NOT see any notification about this SIP/RTP call from PJSIPSUA perspective on winXP, PJSIPSUA says: "You have 0 active call" on WinXP (server) machine however on client (linux machine) says: "You have 1 active session" and I can see SIP/RTP pkts from both PC sides. Does anybody can point it out what is set wrong in cmd on PJSUA server machine (WinXP machine) ? - Pawel