RE: [SIP] SIP - H.323 - INVITE - No media line.
"Maddux, Michel" <Michel.Maddux@COMPAQ.com> Wed, 15 November 2000 22:42 UTC
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From: "Maddux, Michel" <Michel.Maddux@COMPAQ.com>
To: 'Vladislav Zubarev' <vladis@vovida.com>, Igor Slepchin <ISlepchin@dynamicsoft.com>
Cc: sip@lists.bell-labs.com, "Lawhorn, Tom" <Tom.Lawhorn@COMPAQ.com>, "Byrne, Sam" <Sam.Byrne@COMPAQ.com>, "Hurlbert, John" <john.hurlbert@COMPAQ.com>
Subject: RE: [SIP] SIP - H.323 - INVITE - No media line.
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Date: Wed, 15 Nov 2000 16:41:03 -0600
RFC 2543 Section B.4 states: <!--StartFragment--> B.4 Delayed Media Streams In some cases, a caller may not know the set of media formats which it can support at the time it would like to issue an invitation. This is the case when the caller is actually a gateway to another protocol which performs media format negotiation after call setup. When this occurs, a caller MAY issue an INVITE with a session description that contains no media lines. The callee SHOULD interpret this to mean that the caller wishes to participate in a multimedia session described by the session description, but that the media streams are not yet known. The callee SHOULD return a session description indicating the streams and media formats it is willing to support, however. The caller MAY update the session description either in the ACK request or in a re-INVITE at a later time, once the streams are known. The I-D - Singh/Schulzrinne states: "... [snip - to page 14...] The default session description MUST be either empty or conatin media descriptio (m=) lines indicating lthe minimal capabilities of any H.323 terminal handled by the IWF." The sip UAC that I'm using for testing either doesn't respond correctly (e.g. with the appropriate media), or the I-D is in conflict with the spec on this item, or perhaps I'm sending an inappropriate value for the "empty" string in the SDP m= line. From my reading, I interpret the phrase "empty" to mean the following line: c=IN IP4 0.0.0.0 m=audio 0 RTP/AVP 0 Yet when I send this line, instead of getting back the expected line: c=IN IP4 real.ip.address.here m=audio 8000 RTP/AVP 8 I receive: m=audio 0 RTP/AVP 0 A blank media line is either: m= or no m= line at all. In both case the UAC issues a rejection. so I'm still unable to ascertain how to setup the port. Any comments? thanks. /m. -----Original Message----- From: Vladislav Zubarev [mailto:vladis@vovida.com] Sent: Tuesday, November 14, 2000 6:25 PM To: Igor Slepchin Cc: Maddux, Michel; sip@lists.bell-labs.com; Lawhorn, Tom; Byrne, Sam; Hurlbert, John Subject: Re: [SIP] SIP - H.323 - INVITE - No media line. Again, call scenarios with different issues resolving (like this) can be found in the following document: http://search.ietf.org/internet-drafts/draft-singh-sip-h323-01.txt <http://search.ietf.org/internet-drafts/draft-singh-sip-h323-01.txt> Thanx. Igor Slepchin wrote: > 1) When 323 calls, wait until it opens first media channel. > Then issue the > INVITE, noting only a media line of that media type but with > a phony port. > When Sip replies (200 OK presumed), complete the 323 media > channel being > negotiated, giving it the Sip's media port. Then negotiate the reverse > channel with 323, saving its port, which is then transmitted > to Sip via an > ACK with a message body correcting the 323 media port. This is illegal in SIP (see section 4.2.1 in 2543bis). You should use re-INVITE if you want to modify the session offered in INVITE request. Thank you, Igor Slepchin _______________________________________________ SIP mailing list SIP@lists.bell-labs.com http://lists.bell-labs.com/mailman/listinfo/sip <http://lists.bell-labs.com/mailman/listinfo/sip> -- Vladislav Zubarev mailto:vladis@vovida.com <mailto:vladis@vovida.com> Software Engineer Vovida Networks, Inc. http://www.vovida.com <http://www.vovida.com> _______________________________________________ SIP mailing list SIP@lists.bell-labs.com http://lists.bell-labs.com/mailman/listinfo/sip
- RE: [SIP] SIP - H.323 - INVITE - No media line. Igor Slepchin
- Re: [SIP] SIP - H.323 - INVITE - No media line. Vladislav Zubarev
- [SIP] SIP - H.323 - INVITE - No media line. Maddux, Michel
- Re: [SIP] SIP - H.323 - INVITE - No media line. Vladislav Zubarev
- RE: [SIP] SIP - H.323 - INVITE - No media line. Maddux, Michel
- Re: [SIP] SIP - H.323 - INVITE - No media line. Vladislav Zubarev