Hello, SIP first of all uses UDP most of the times (and rarely TCP) . It only create a tunnel that other protocols such as RDP and SDP are going inside.
Can you explain a bit more what exactly do you wish to implement (i'm not sure that I understand) ? Ido http://ik.homelinux.org/ On Tue, Jan 5, 2010 at 15:08, lloyd thomas <lloydi...@googlemail.com> wrote: > 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 > > ----------------------------------------------------------------------------------------------- > > > > > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal >
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