Yea, there is siptrace, when enabled. sofia global siptrace on freeswitch@lab3> send 1181 bytes to udp/[192.168.5.21]:5062 at 15:16:40.952027: ------------------------------------------------------------------------ INVITE sip:sip3779100@192.168.5.21:5062 SIP/2.0 Via: SIP/2.0/UDP 192.168.100.11;rport;branch=z9hG4bKN2QvX33eK72rr Route: <sip:sip3779100@192.168.5.21:5062> Max-Forwards: 70 From: "" <sip:907388397@192.168.100.11>;tag=KXXUQ57gS66ZS To: <sip:sip3779100@192.168.5.21:5062> Call-ID: c47c3593-fccd-122e-c796-bcaec59901b2 CSeq: 12573020 INVITE Contact: <sip:mod_sofia@192.168.100.11:5060> User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-fccbba5 2011-05-18 19-00-42 -0400 Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE Supported: timer, precondition, path, replaces Allow-Events: talk, hold, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer Content-Type: application/sdp Content-Disposition: session Content-Length: 209 X-FS-Support: update_display Remote-Party-ID: <sip:907388397@192.168.100.11>;party=calling;screen=yes;privacy=off v=0 o=FreeSWITCH 1305790653 1305790654 IN IP4 192.168.100.11 s=FreeSWITCH c=IN IP4 192.168.100.11 t=0 0 m=audio 27516 RTP/AVP 0 8 3 101 13 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 ------------------------------------------------------------------------ recv 304 bytes from udp/[192.168.5.21]:5062 at 15:16:40.968185: ------------------------------------------------------------------------ SIP/2.0 100 Trying To: <sip:sip3779100@192.168.5.21:5062> From: "" <sip:907388397@192.168.100.11>;tag=KXXUQ57gS66ZS Call-ID: c47c3593-fccd-122e-c796-bcaec59901b2 CSeq: 12573020 INVITE Via: SIP/2.0/UDP 192.168.100.11;branch=z9hG4bKN2QvX33eK72rr Server: Linksys/SPA942-6.1.3(a) Content-Length: 0 ------------------------------------------------------------------------ send 414 bytes to udp/[192.168.5.21]:5062 at 15:16:40.968378: ------------------------------------------------------------------------ CANCEL sip:sip3779100@192.168.5.21:5062 SIP/2.0 Via: SIP/2.0/UDP 192.168.100.11;rport;branch=z9hG4bKN2QvX33eK72rr Route: <sip:sip3779100@192.168.5.21:5062> Max-Forwards: 70 From: "" <sip:907388397@192.168.100.11>;tag=KXXUQ57gS66ZS To: <sip:sip3779100@192.168.5.21:5062> Call-ID: c47c3593-fccd-122e-c796-bcaec59901b2 CSeq: 12573020 CANCEL Reason: Q.850;cause=16;text="NORMAL_CLEARING" Content-Length: 0 ------------------------------------------------------------------------ recv 356 bytes from udp/[192.168.5.21]:5062 at 15:16:40.984188: ------------------------------------------------------------------------ SIP/2.0 481 Call Leg/Transaction Does Not Exist To: <sip:sip3779100@192.168.5.21:5062>;tag=1f405cc57aec781ei2 From: "" <sip:907388397@192.168.100.11>;tag=KXXUQ57gS66ZS Call-ID: c47c3593-fccd-122e-c796-bcaec59901b2 CSeq: 12573020 CANCEL Via: SIP/2.0/UDP 192.168.100.11;branch=z9hG4bKN2QvX33eK72rr Server: Linksys/SPA942-6.1.3(a) Content-Length: 0 ------------------------------------------------------------------------ recv 386 bytes from udp/[192.168.5.21]:5062 at 15:16:40.994546: ------------------------------------------------------------------------ SIP/2.0 180 Ringing To: <sip:sip3779100@192.168.5.21:5062>;tag=4482dc0be7df9455i2 From: "" <sip:907388397@192.168.100.11>;tag=KXXUQ57gS66ZS Call-ID: c47c3593-fccd-122e-c796-bcaec59901b2 CSeq: 12573020 INVITE Via: SIP/2.0/UDP 192.168.100.11;branch=z9hG4bKN2QvX33eK72rr Contact: "sip3779100" <sip:sip3779100@192.168.5.21:5062> Server: Linksys/SPA942-6.1.3(a) Content-Length: 0