Hi,

I'd like to clarify some facts concerning INVITE transactions which contain
an early media response e.g.

INV-->
<--183
<--200
ACK-->

Is it permissable/possible for the 200 OK to negotiate different SDP than
the SDP negotiated in the 183?

That is, is:-

INVITE
...
m=audio 6980 RTP/AVP 18 8 4 0


183
...
m=audio 4780 RTP/AVP 18 8


200
...
m=audio 4790 RTP/AVP 4 0


ACK

a valid exchange?

Thanks for your time,

Matthew Gardiner
Software Engineer
Aculab 
Tel: +44 (0) 1908 273 911
Fax: +44 (0) 1908 273 801
Email: mailto:[EMAIL PROTECTED]
Website: <http://www.aculab.com>

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