[Users] BYE before 200 OK?

[Iqbal]

no BYE should occur, after 200 OK, your UAC should send ACK to openser, 
and openser  ACK to gateway, it seems as if the pstn GW is not getting 
the ACK's

Iqbal

Michael Ulitskiy wrote:

>Hello,
>
>Can someone please enlighten me on if this is allowed to send BYE
>before 200 OK? I thought that BYE should be used only after dialog
>established, but now I have a SIP PSTN termination provider and they
>appear to be sending BYE with route headers right after 183 Session Progress
>in some cases.
>So the session looks like the following:
>UAC                                OpenSER PSTN                       Provider UAS
>INVITE to openser
>                                         180 Trying back to UAC
>                                         INVITE to UAS
>                                                                                                180 Trying back to openser
>                                                                                                183 Session progress back to openser
>                                       183 Session Progress back to UAC
>                                                                                                BYE to openser with Route headers
>                                       BYE to UAC (loose_routing)
>200 OK to openser
>                                       200 OK to UAS
>Is it ok?
>And there's even more to it. I don't know if above is OK or not, but I would thought 
>that now the session is ended. Nonetheless in exactly 50 seconds I'm getting
>                                                                                                  183 Session progress back to openser
>                                       183 Session progress back to UAC
>-- in another 60 seconds
>                                                                                                   183 Session progress back to openser
>                                       183 Session progress back to UAC
>-- this happens 6 times every 60 seconds and then
>                                                                                                   408 Request Timeout back to openser
>                                        ACK to UAS
>                                        408 Request Timeout to UAC
>ACK to openser
>
>Do you think it's a provider bug? 
>Another question is how openser is routing replies that cannot be matched to transaction
>as I think transaction has already been deleted after BYE and latest 183 replies were routed
>by some other principle. 
>Could please someone comment on this?
>Thanks,
>
>See you later,
>                    Michael
>
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