Hi Paulo,
In your case SDP in 180 and SDP in 200 OK must be same (as per rfc 3261).
This helps in setting the media codecs and the socket prior to 200OK. SDP
in non-reliable provisional responses doesn't correspond to the early
media.
As the response being non reliable you can't rely on it.
Rgds,
Amar
The greatest enemy of best is "good." If you're willing to accept "good"
you'll never be the "Best."
"Paulo de Arruda
Borelli"
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e.com>
01/25/2006 02:29 cc
PM <[email protected]>,
<[EMAIL PROTECTED]
ia.edu>
Subject
RE: [Sip-implementors] 180 Ringing
with SDP
Hi Amar,
I can't understand why are you talking about reliable responses... They are
not necessarily related to the SDP usage. I can't find anything, on the RFC
excerpts you selected, telling that SDP is ok in 180 responses.
Would you clarify this why you selected these excerpts?
Thank you
Paulo.
-----Original Message-----
From: [EMAIL PROTECTED]
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Sent: Wednesday, January 25, 2006 2:46 AM
To: Paulo de Arruda Borelli
Cc: [email protected];
[EMAIL PROTECTED]
Subject: Re: [Sip-implementors] 180 Ringing with SDP
Hi,
As per the RFC 3262 any response between 101 to 199 can be sent reliably.
From sec 3.
"A UAS MUST NOT attempt to send a 100 (Trying) response reliably.
Only provisional responses numbered 101 to 199 may be sent reliably.
If the request did not include either a Supported or Require header
field indicating this feature, the UAS MUST NOT send the provisional
response reliably."
From sec 4.
"If a provisional response is received for an initial request, and
that response contains a Require header field containing the option
tag 100rel, the response is to be sent reliably. If the response is
a 100 (Trying) (as opposed to 101 to 199), this option tag MUST be
ignored, and the procedures below MUST NOT be used."
So there is no harm in sending SDP in 180 ringing for early media. You
should not restrict it only to 183.
Rgds,
Amar
The greatest enemy of best is "good." If you're willing to accept "good"
you'll never be the "Best."
"Paulo de Arruda
Borelli"
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om.br> <[email protected]>
Sent by: cc
sip-implementors-
[EMAIL PROTECTED] Subject
ia.edu [Sip-implementors] 180 Ringing with
SDP
01/25/2006 06:18
AM
Hi,
Why would an UAC send 180 Ringing with SDP? If it's supposed to use early
media, then 183 Session Progress is more appropriate, right?
In my understanding, 180 with SDP is contradictory. 180 means: "play a
local
ringback tone". But the SDP content means: open the media path (in my
scenario, the original INVITE message did include SDP too).
So what is the reason for using 180 with SDP in the scenario bellow?
INVITE/SDP from A to B
180/SDP from B to A
200/SDP from B to A
Thank you,
Paulo A. Borelli
Gerente de Engenharia / Engineering Manager
TMais S.A.
VoIPMais: +55-11-2626-1080, r. 1136
Cell: +55-11-9282-5990
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