Niranjan Gopalakrishnan wrote:
I have a question on the same lines.
Lets say INVITE and 183 had an offer and answer.
Is it possible for 200 response to have a new offer?
For example 183 has SDP of a Media server (different IP)which plays an announcement.
Then user answers with 200 OK, can this be a new SDP -offer?
Its a good question. The answer is NO. For details, see
draft-sawada-sipping-sip-offeranswer-00.txt.
Note: that draft is not intended to break any new ground - in theory all
this should be derivative to the referenced RFCs. But it turns out that
things are not so clear, and reasonable people can differ in
interpretation. Over a year ago there were extensive discussions on the
subject which resulted in a number of agreed upon interpretations. Those
were never documented anywhere. Sawada has now written that all down in
the draft referenced above.
Paul
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Ben
Gatewood
Sent: Friday, October 28, 2005 10:28 AM
To: 'Paul Kyzivat'
Cc: [email protected]
Subject: RE: [Sip-implementors] Offer-Answer in SIP
Inline and snipped.
Trying to respond to all the discussers in one response - inline.
(BTW, I'm not seeing the blue. Would prefer conventional quoting.)
I just guessed which bits were blue ;-)
It turns out that there are some PSTN features that seem to require
this. In particular, there are some features that prompt for a PIN
before permitting the call to proceed. Two-way audio before answer is
one way to handle those in sip.
I considered that scenario but for some reason assumed that the call would
normally be "answered" by some kind of media server to provide that service.
Now I think about it, your way makes more sense.
B
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