The normal SIP and offer/answer rules apply here and hence use of
UPDATE for the second O/A exchange is indeed an option. Note however,
that the initial O/A exchange must always complete first, and hence you
either need to receive a 200 OK, or use reliable provisional responses.
-- Flemming
Zhengrong Yao wrote:
Hi:
Maybe an obsolete question but I did not manage
to find hint in the MMUSIC email threads...
Although nothing preventing this but is it good
to suggest in application to send 2nd round o/a exchange within UPDATE
message, meaning that Alice and Bob can start session already after 1st
round o/a exchange, and dont need to wait until the 2nd round (unless
it has to be done in another INVITE SIP message). Of course issues in
3.12 remains the same.
In draft now the text for 2nd round read as: "Alice’s updated offer..." Is
this an indication for usiing UPDATE to do 2nd o/a exchage or? it
makes "2nd delay" less scary.
Thanks a lot for tips
BR
Zhengrong Yao
Zhengrong Yao Ph.D.
Standardization Manager
Ericsson AB
Business Unit
Multimedia Office: +46 46 194584
Scheelevägen 17 Fax: +46 76 130 3945
SE22370, Lund,
Sweden Mobile: +46 703 674584
www.ericsson.com
Email: Zhengrong.Yao at ericsson.com
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