On 5. svi. 2010., at 15:23, Peter Saint-Andre wrote: > On 5/5/10 7:05 AM, Will Thompson wrote: >> On 05/05/10 11:31, Ivan Vučica wrote: >>> Apparently, iChat on Mac does not exchange same capabilities bits as >>> other A/V capable XMPP clients. Probably the underlying A/V protocol >>> and codec is different from what is used elsewhere, too. Did anyone >>> dig into what iChat does and try adding the capability into >>> farsight/gabble? >> >> I seem to recall someone saying that iChat sets up a SIP session for >> A/V. (But this is just hearsay.) > > My understanding is that iChat uses either SIP or something derived from > SIP for its A/V signalling. > > Peter
Almost none of my friends on contact list use iChat, so I barely got a friend to turn it on before he went to sleep. Sadly, iChat automatically negotiates TLS with the server and I didn't have time to reconfigure server to reject it. However I did see some SIP (and related STUN traffic); or at least some traffic identified as such by Wireshark. Sadly I cannot see the XMPP traffic that created the connection. I'll try to remember to post some info, if you guys are interested. I'm a horrible reverse engineer when it comes to binary stuff, and I have absolutely no knowledge of how codecs and internet telephony works, though. If I can contribute through providing packet and traffic logs and testing, I'd be happy to do it. Of course, only if someone wishes to waste some time on supporting iChat :-) More info (from unencrypted sip/stun headers) -- I have somewhat anonymized the logs From me: Via: SIP/2.0/UDP IP.HAS.BEEN.OMITTED:16402;branch=z9hG4bK501d86970fd1f8ed Max-Forwards: 70 To: "[email protected]" <sip:[email protected]:16402> From: "[email protected]" <sip:[email protected]:16402>;tag=462471572 Call-ID: 83f8f2f6-5883-11df-aea1-8e9601764...@192-168-2-5 CSeq: 1 INVITE Contact: <sip:[email protected]:16402>;isfocus User-Agent: Viceroy 1.4 Content-Type: application/sdp Content-Length: 710 v=0 o=ivucica 0 0 IN IP4 IP.HAS.BEEN.OMITTED [email protected] c=IN IP4 IP.HAS.BEEN.OMITTED b=AS:2147483647 t=0 0 a=hwi:17412:2:2260 a=iChatEncryption:NO a=bandwidthDetection:YES m=audio 16402 RTP/AVP 110 12 124 3 0 a=rtcp:16402 a=rtpmap:110 X-AAC_LD/22050 a=rtpmap:3 GSM/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:124 iLBC/8000 a=fmtp:124 mode=30 a=rtpID:2349124651 m=video 16402 RTP/AVP 123 126 34 a=rtcp:16402 a=rtpmap:123 H264/90000 a=rtpmap:126 X-H264/90000 a=rtpmap:34 H263/90000 a=fmtp:34 imagesize 1 rules 30:352:288 a=framerate:30 a=RTCP:AUDIO 16402 VIDEO 16402 a=fmtp:126 imagesize 0 rules 20:640:480:640:480:20 a=fmtp:123 imagesize 0 rules 20:640:480:640:480:20 a=rtpID:1645632791 Now received sip/stun traffic from udp: SIP/2.0 100 Trying Via: SIP/2.0/UDP IP.HAS.BEEN.OMITTED:16402;branch=z9hG4bK501d86970fd1f8ed To: "[email protected]" <sip:[email protected]:16402> From: "[email protected]" <sip:[email protected]:16402>;tag=462471572 Call-ID: 83f8f2f6-5883-11df-aea1-8e9601764...@192-168-2-5 CSeq: 1 INVITE User-Agent: Viceroy 1.4 Content-Length: 0 SIP/2.0 180 Ringing Via: SIP/2.0/UDP IP.HAS.BEEN.OMITTED:16402;branch=z9hG4bK501d86970fd1f8ed To: "[email protected]" <sip:[email protected]:16402>;tag=162373534 From: "[email protected]" <sip:[email protected]:16402>;tag=462471572 Call-ID: 83f8f2f6-5883-11df-aea1-8e9601764...@192-168-2-5 CSeq: 1 INVITE Contact: <sip:[email protected]:16402> User-Agent: Viceroy 1.4 Content-Length: 0 SIP/2.0 200 OK Via: SIP/2.0/UDP IP.HAS.BEEN.OMITTED:16402;branch=z9hG4bK501d86970fd1f8ed To: "[email protected]" <sip:[email protected]:16402>;tag=162373534 From: "[email protected]" <sip:[email protected]:16402>;tag=462471572 Call-ID: 83f8f2f6-5883-11df-aea1-8e9601764...@192-168-2-5 CSeq: 1 INVITE Contact: <sip:[email protected]:16402> User-Agent: Viceroy 1.4 Content-Type: application/sdp Content-Length: 442 v=0 o=USERNAMEOMITTED 0 0 IN IP4 REMOTE.IP.WAS.OMITTED [email protected] c=IN IP4 REMOTE.IP.WAS.OMITTED b=AS:2147483647 t=0 0 a=hwi:17412:2:2260 a=bandwidthDetection:YES a=iChatEncryption:NO m=audio 16402 RTP/AVP 110 a=rtcp:16402 a=rtpmap:110 X-AAC_LD/22050 a=rtpID:3434490873 m=video 16402 RTP/AVP 123 a=rtcp:16402 a=rtpmap:123 H264/90000 a=RTCP:AUDIO 16402 VIDEO 16402 a=fmtp:123 imagesize 0 rules 20:640:480:640:480 a=rtpID:1528821049 Now again sent from me: ACK sip:[email protected]:16402 SIP/2.0 Via: SIP/2.0/UDP IP.HAS.BEEN.OMITTED:16402;branch=z9hG4bK2baeed221cc1fcbb Max-Forwards: 70 To: "[email protected]" <sip:[email protected]:16402>;tag=162373534 From: "[email protected]" <sip:[email protected]:16402>;tag=462471572 Call-ID: 83f8f2f6-5883-11df-aea1-8e9601764...@192-168-2-5 CSeq: 1 ACK User-Agent: Viceroy 1.4 Content-Length: 0 The rest appears to be video data. Again, sorry for not having XMPP data to share. -- Regards, Ivan Vučica
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