[reSIProcate] Call disconnect due to re-invite timeout

[Byron Campen]

	This is interesting... By the time (1) is sent, it is too late for  
DUM to redirect it. Sending a CANCEL and retrying the INVITE could  
work, but this would not help if we were using an UPDATE instead.  
Maybe we could treat 408 as a 503 with Retry-After==0 if our remote  
contact has changed since the request was sent?

	Do people think this is a corner-case that we want to solve for this  
release?

Best regards,
Byron Campen

> Hi,
>
>     I have a B2B based on resiprocate-1.1 sip stack. I am facing a  
> problem of call disconnect because of re-invite timeout. The call  
> flow is given below.
>
> DUM updates the remote party contact on getting a re-invite  
> (message 4). But DUM does not cancel/redirect any previous request  
> (message 1) sent by it. I believe DUM should atleast ignore any  
> response of re-INVITE in such case.
>
> Can someone provide inputs to how this can be resolved?
>
>
>
>         B2BUA           client-A
>
>           |                 |
>
>           |                 |
>
>           |                 |
>
>           |(1) re-INVITE    |
>
>           |---------------->|
>
>           |(2) REGISTER(new IP address)
>
>           |<----------------|
>
>           |(3) 200 OK       |
>
>           |---------------->|
>
>           |(4) re-INVITE (from new IP)
>
>           |<----------------|
>
>           |(5) 491 Request Pending
>
>           |---------------->|
>
>           |(6) ACK          |
>
>           |<----------------|
>
>           |(7) re-INVITE (retransmission to old IP of client-A)
>
>           |---------------->|
>
>           |Call disconnect due to timeout of
>
>           |                 |
>
>           |re-INVITE to client-A
>
>           |                 |
>
>
>
> Regards,
>
> Mayur Ninama,
>
> Sr Software Engg.
>
> Varaha Systems
>
>
>
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