[SIPForum-discussion] need help from people who know all the rules by heart

[Tomasz Zieleniewski]

Hi,

If UAC receives a Re-INVITE request it should send any final response to UAS.
In case when it doesn't there is a timeout at UAS side for this
Re-INVITE transaction fired by B timer.
In such case UAS should terminate the dialog by sending BYE request to UAC.
Generally sending BYE request by UAC is allowed because UA may
initiate a regular transaction
while an INVITE transaction is in progress. But if in this case
sending BYE is any way related to
receiving of the Re-INVITE request then it is wrong.

Regards
- Tomasz Zieleniewski

2009/4/17 Michael Trank <mtrank at apexvoice.com>:
>
> I have a situation where some sessions between a UAC and a UAS look like
> this:
>
> It looks like this:
>
>       UAC                                    UAS
>
>      INVITE         ===>>
>      200 OK    <<===
>      ACK         ===>>
>
> some seconds pass by....
>
>      Re-INVITE   <<====  ( with "BlackHole" SDP )
>      100 Trying   ===>
>      BYE        ===>
>       100 Trying    <===  ( provisional for BYE  )
>        BYE      ===>
>       100 Trying    <===  ( provisional for BYE  )
>       BYE      ===>
>       100 Trying    <===  ( provisional for BYE )
>       BYE      ===>
>       100 Trying    <===  ( provisional for BYE  )
>       BYE      ===>
>       100 Trying    <=== ( provisional for BYE  )
>
>
> and thats it, things kind of get stuck like this. The BYE's stop, but
> the call finished somewhat un-gracefully.
>
> What is supposed to happen  when  a  re-INVITE gets sent in one
> direction and  a BYE gets sent in the other, ignoring the re-INVITE?
>
>
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