Re: [MMUSIC] SDPCapNeg : 2nd o/a via UPDATE?

[Bob Gilman <bob_gilman at comcast.net>]

I think it's always possible, using media capabilities, to frame
an offer such that there is no need for a second O/A exchange.
I'd be interested in seeing counterexamples.
-Bob
-------------------------------------------------------------
Bob Gilman        bob_gilman at comcast.net      +1 303 898 9780



Flemming Andreasen wrote:
> 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_ <http://www.ericsson.com/>                Email: 
>> _Zhengrong.Yao at ericsson.com_ <mailto:Zhengrong.Yao at ericsson.com>
>>
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> 
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