You say "if I make a call to the SIP GW", but you do not specify what UA is making the call, nor what SDP it is sending.
[sv] the snom is making the call to the sip gw using g729a20, and the call is accepted. In the example you gave, it contains streams for audio and one for video, but for the audio, all the media formats are presented as part of the first "m". I will have to do some reading, because clearly I am missing something obvious. I believe that if the SIP GW sends G729A10 and G729A20, the call should be accepted by the Snom configured for G729A20, but it's not. However, the reverse Snom to SIP GW works just fine. Thanks for your help. Steve -----Original Message----- From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED] Sent: Thu 2/22/2007 9:25 AM To: [email protected] Subject: Re: [Sip-implementors] FW: SDP and ptime in RFC4566 is faulty From: [EMAIL PROTECTED] I just ran some tests with various brands of phones and none send ptime in their SDP, which makes this harder to understand. Here is one from a polycom. Are you saying that even though 3 media formats are listed, they are represented as one media stream? Is there an example of one that includes multiple media streams you can point me to. RFC 4317, "Session Description Protocol (SDP) Offer/Answer Examples", section 2.1: v=0 o=alice 2890844526 2890844526 IN IP4 host.atlanta.example.com s= c=IN IP4 host.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 8 97 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:97 iLBC/8000 m=video 51372 RTP/AVP 31 32 a=rtpmap:31 H261/90000 a=rtpmap:32 MPV/90000 This contains specifications for two media streams, because there are two "m" lines. I guess I am now thoroughly confused. When my SIP gateway sends g729a10 and g729a20 to a snom, the call fails because only ptime 10 is listed and the phone is only configured to receive g729a20. That makes sense. But, as I mentioned, my SIP GW wants to talk 10 or 20. However, if I make a call to the SIP GW, it connects at 729a20. Does this make any sense at all? You say "if I make a call to the SIP GW", but you do not specify what UA is making the call, nor what SDP it is sending. Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): - 1172011391 1172011391 IN IP4 10.153.90.9 Owner Username: - Could you please quote SDP as SDP rather than the extremely verbose Ethereal expansion of SDP? Dale _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
