Please forgive my ignorance regarding the project I am about to embark on. Need some advice on Lnet and capturing SIP RTP data to file. In the first instance I just need to work with the sip messages. I believe the SIP messages are similar to HTTP. I am using wireshark to understand how the SIP messages are processed, but I am not sure how to capture and read each frame (wireshark speak) using Lnet.
(FYI: http://en.wikipedia.org/wiki/Session_Initiation_Protocol#SIP_network_elements ) For instance the following is from frame 12 (935 bytes) ---------------------------------------------------------------------------------------------- INVITE sip:1...@192.168.91.200 <sip%3a1...@192.168.91.200> SIP/2.0 Via:SIP/2.0/UDP 192.168.91.190:5060;rport;branch=z9hG4bK83570061 From:"Lloyd" <sip:1...@192.168.91.200 <sip%3a1...@192.168.91.200> >;tag=4b428357-2fa-1ec5d4e To:<sip:1...@192.168.91.200 <sip%3a1...@192.168.91.200>> Contact:"Lloyd" <sip:1...@192.168.91.190:5060;transport=UDP> Call-ID:83570000-4ce59...@192.168.91.200<call-id%3a83570000-4ce59...@192.168.91.200> Subject:sip phone call CSeq:2112045024 INVITE User-Agent:Mitel-5212-SIP-Phone 07.02.00.04 08000F24BEE5 Allow:INVITE,ACK,CANCEL,BYE,OPTIONS,REFER,NOTIFY,PRACK,UPDATE Allow-Events:talk,hold,conference Supported:timer,100rel,replaces Session-Expires: 1800 Min-SE: 90 Max-Forwards:70 Content-Type:application/sdp Content-Length:247 v=0 o=1000 1262650963 1262650962 IN IP4 192.168.91.190 s=SIP Call c=IN IP4 192.168.91.190 t=0 0 a=sendrecv m=audio 20036 RTP/AVP 0 8 18 96 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=rtpmap:96 telephone-event/8000 ----------------------------------------------------------------------------------------------- I get a response from the sip server on frame 13 (371 bytes) ---------------------------------------------------------------------------------------------- SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.91.190:5060;rport=5060;branch=z9hG4bK83570061 From: "Lloyd" <sip:1...@192.168.91.200 <sip%3a1...@192.168.91.200> >;tag=4b428357-2fa-1ec5d4e To: <sip:1...@192.168.91.200 <sip%3a1...@192.168.91.200>> Call-ID: 83570000-4ce59...@192.168.91.200 CSeq: 2112045024 INVITE User-Agent: FreeSWITCH-mod_sofia/1.0.trunk-15355M Content-Length: 0 -----------------------------------------------------------------------------------------------
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