Christer Holmberg wrote:
Hi,
What if the offerer is not "prepared" to receive an updated answer (it
only included the "offer" because it had to)? How can it "reject" the
answer?
It can't. At best it can make a counter offer after the fact, or
terminate the call after the fact.
But that clearly isn't a good policy. You should design your UA so that
this isn't an issue. When you make an offer you must always be prepared
for the answer be anything that is compatible with the offer.
I personally think that an unchanged o- line in the offer should not
allow the answer to change.
One could of course change the o- line in the offer - even if the offer
itself hasn't changed - and that would then allow the answer to be
changed.
Personally I think the o-line changing or not is just an extra
complication that should never have been there as a factor. Whether the
o-line changes or not isn't what matters. What matters is whether the
rest of the SDP changes. At best the o-line is a hint about whether the
rest changed or not, and simply introduces the potential error case
where the SDP doesn't agree with what the o-line is hinting. (So what
should you do if the o-line is unchanged but the SDP is changed?)
But as things are written, you are expected to make the o-line the same
if the rest of the SDP is the same. The o-line in the offer has
*nothing* to do with what is in the answer.
Paul
Just some thinking...
Regards,
Christer
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: 20. marraskuuta 2007 3:39
To: [email protected]
Subject: Re: [Sip] SIPit 21: Question about offer answer
From: Paul Kyzivat <[EMAIL PROTECTED]>
A 3pcc controller doing a transfer may well send an
offerless invite to
one UA and then send the offer it gets back to an entirely
different UA
than had been in the session before. So of course the
answer will be
entirely different.
Hmmm, "my" music-on-hold proposal does that, too.
Dale
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