[SIPForum-discussion] 481 call leg/transaction does not exists

[Retesh]

ACK cannot have a response. In the scenario 200 ok will be
retransmitted by UAS until it receives ACK. If it doesnt receive ACK
till a time period, it will timeout and send BYE.

Regards
Retesh

On Tue, Jun 21, 2011 at 7:44 PM, Rohan Almeida <almeida.rohan at gmail.com> wrote:
> Hi Raghul,
>
> consider a scenario where
> 1> A sends Invite to B
> 2> B sends 200 OK to A. there is delay introduced by nw
> 3> A gets 200 OK just before its timeout
> 4> B has timedout for this transaction. and destroys this transaction
> 5> A sends ACK
>
> A  - INVITE - > B
> A <- 200 OK -   B
>   (delay)
>   (timeout)
> A  -  ACK    -> B
>
> now since B has destroyed the transaction it will send 481  call
> leg/transaction does not exists for the ACK message it sent in
> response to a 200 OK.
>
> regards,
> Rohan Almeida
>
> On 6/19/11, Raghul Prasanna <raghul82 at yahoo.co.uk> wrote:
>> Hello all,
>>
>> Can a sip device receive 481 call leg/transaction does not exists for the
>> ACK message it sent in response to a 200 OK? Please explain.
>>
>> Thanks,
>> Raghul
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