答复: Re: [Sipping] "UPDATE during Re-INVITE" discussion

Precondition do modify session parameters. Precondition state is part of 
session parameters.

The point is that if SDP only refresh "precondtion state table", it has no 
impact on the commitment of session modification.




"Christer Holmberg" <[email protected]> 
发件人:  [email protected]
2009-03-10 23:15

收件人
"Brett Tate" <[email protected]>, "SIPPING" <[email protected]>, "SIP" 
<[email protected]>
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主题
Re: [Sipping] [Sip] "UPDATE during Re-INVITE" discussion







Hi, 

>>Regarding your second bullet, I don't even think that one should send 
>>"nested" UPDATEs, if they don't have anything to do with the 
>>re-INVITE. I think that is bad application design.
>>Non-related changes should be done outside the re-INVITE transaction.
>  
>Sending UPDATE per RFC 4028 to refresh or audit the dialog is 
>one of the times UPDATE may be tried while a re-INVITE is occurring.

True, but normally those UPDATEs are not going to modify session 
parameters.

So, yes, it may happen, but I think we should recommend against doing so.

Regards,

Christer

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