Manpreet Singh wrote:
> Wasn't denying the use of update on confirmed dialog, just saying the
> recommended use of UPDATE is for early dialog and not for confirmed
> based on the spec.
>
> ""Although UPDATE can be used on confirmed
> dialogs, it is RECOMMENDED that a re-INVITE be used instead. This is
> because an UPDATE needs to be answered immediately, ruling out the
> possibility of user approval. Such approval will frequently be
> needed, and is possible with a re-INVITE.""
IMO the "denial" is a bit overstated. It is only pointing out that its
inappropriate if the offer it carries will require an extended time for
approval before being answered. If that isn't to be the case then there
isn't any issue with using UPDATE.
Note that the issue with immediate response also applies to an UPDATE
used during an early dialog.
Paul
> Thnx
>
> -----Original Message-----
> From: Paul Kyzivat [mailto:[EMAIL PROTECTED]
> Sent: Saturday, April 12, 2008 11:49 PM
> To: Manpreet Singh
> Cc: kaiduan xie; Bob Penfield; [EMAIL PROTECTED];
> sip-implementors@lists.cs.columbia.edu
> Subject: Re: [Sip-implementors] Offer/Answer question
>
> It is permitted to use UPDATE after a dialog has been established. AFAIK
> the flow shown is legal. In any case from the POV of the UAS, it is no
> different than if the ACK had been sent first and then the UPDATE send,
> with the UPDATE arriving first, which can happen.
>
> Paul
>
> Manpreet Singh wrote:
>> I believe the recommended use of UPDATE for offer/answer is in early
>> dialog state but after 200OK, its in confirmed dialog state. But if
>> that limitation werent there, then it might just be valid to do it
>> too. May be other folks can confirm?
>>
>> M
>>
>> -----Original Message-----
>> From: kaiduan xie [mailto:[EMAIL PROTECTED]
>> Sent: Friday, April 11, 2008 10:32 PM
>> To: Bob Penfield; Manpreet Singh; [EMAIL PROTECTED];
>> sip-implementors@lists.cs.columbia.edu
>> Subject: Re: [Sip-implementors] Offer/Answer question
>>
>> Is the following case legal?
>>
>> UAC UAS
>> INVITE/SDP ------------------->
>> <-------------------------------- 200/SDP, UPDATE/SDP
>> ---------------->
>> <------------ 200 for UPDATE/SDP
>> ACK(no SDP) ------------------>
>>
>> There is no PRACK in the call flow.
>>
>> Thanks,
>>
>> kaiduan
>> ----- Original Message ----
>> From: Bob Penfield <[EMAIL PROTECTED]>
>> To: Manpreet Singh <[EMAIL PROTECTED]>; "[EMAIL PROTECTED]"
>> <[EMAIL PROTECTED]>; "sip-implementors@lists.cs.columbia.edu"
>> <sip-implementors@lists.cs.columbia.edu>
>> Sent: Friday, April 11, 2008 5:54:36 PM
>> Subject: Re: [Sip-implementors] Offer/Answer question
>>
>> Yes. The 200 OK (or the 180 if using 100rel) MUST have the answer.
>>
>> cheers,
>> (-:bob
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of
>> Manpreet Singh
>> Sent: Friday, April 11, 2008 1:47 PM
>> To: [EMAIL PROTECTED]; sip-implementors@lists.cs.columbia.edu
>> Subject: [Sip-implementors] Offer/Answer question
>>
>> For an INVITE carrying an offer, does the offer/answer has to complete
>
>> within the INVITE transaction? Can it complete outside the transaction
>
>> but within the same dialog? Call flow is:
>>
>> -------------->Invite ( offer )
>> <------------180 ( ringing )
>> <------------200OK ( empty..no offer )
>> ------------->ACK
>> <------------Re-Invite ( Answer to offer in first invite )
>> -------------->200OK
>> <--------------ACK
>>
>> M
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>>
>>
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