[SR-Users] Upstream ignores reply, because To-tag doesn't match?

[Sergiu Pojoga]

To simplify, the problem seems to come down to the following: how do you
cancel/end an early state dialog between the caller and callee after
`fr_inv_timeout` occurs? Kam self-generates a proper CANCEL towards the
callee, while the caller gets a `408 Request Timeout' with a different
To-tag.

I've tried:
dlg_bye("all") - throws an error, non-confirmed dialogs can't be terminated
with this function
t_cancel_callid("$dlg(callid)", "$dlg(from_cseq)", "22", "200") - doesn't
seem to produce any action

Suggestions?

On Sat, Apr 6, 2019 at 11:25 AM Sergiu Pojoga <pojogas at gmail.com> wrote:

> Hi ppl,
>
> Scenario: invite from upstream is t_relayed to a client gateway. After
> `fr_inv_timeout` occurs, in a failure route I simply t_reply with "503 -
> Service unavailable", then exit().
>
> However, the upstream provider simply ignores this reply, call doesn't
> hang up. This doesn't happen when the client's gateway generates identical
> 503 or other negative replies.
>
> I suspect this is happening because the To-tag in the Kam generated 503
> reply doesn't match with the To-tag that previously was forwarded from the
> client's gateway to the upstream provider in the `180 Ringing`.
>
> Any suggestions what can be done about it?
>
>
> 2019/04/06 10:42:46.127177 65.39.xxx.xxx:5060 -> 208.72.xxx.xxx:5060
>
>
> SIP/2.0 180 Ringing
>
>
>
> Via: SIP/2.0/UDP
> 208.72.xxx.xxx:5060;received=208.72.xxx.xxx;rport=5060;branch=z9hG4bK1982422573
>
>
> Record-Route: <sip:65.39.xxx.xxx;lr=on;did=915.8af1>
>
>
>
> From: "SERGIU" <sip:514XXXXXXX at 208.72.xxx.xxx>;isup-oli=00;tag=1975755942
>
>
> To: <sip:514XXXXXXX at 65.39.xxx.xxx>;tag=as2ab54180
>
>
>
> Call-ID: DID-28270826 at 208.72.xxx.xx
>
>
>
> CSeq: 477023 INVITE
>
>
>
> Supported: replaces, timer, path
>
>
>
> Contact: <sip:1514XXXXXXX at 65.39.xxx.xxx:5060>
>
>
>
> Content-Length: 0
>
>
>
>
>
>
>
>
>
>
>
> 2019/04/06 10:42:51.072516 65.39.xxx.xxx:5060 -> 208.72.xxx.xxx:5060
>
>
> SIP/2.0 503 Service Unavailable
>
>
>
> Call-ID: DID-28270826 at 208.72.xxx.xx
>
>
>
> Via: SIP/2.0/UDP
> 208.72.xxx.xxx:5060;rport=5060;branch=z9hG4bK1982422573;received=208.72.xxx.xxx
>
>
> From: "SERGIU" <sip:514XXXXXXX at 208.72.xxx.xxx>;isup-oli=00;tag=1975755942
>
>
> To: <sip:514XXXXXXX at 65.39.xxx.xxx>;tag=
> a6a1c5f60faecf035a1ae5b6e96e979a-8e82
>
>
> CSeq: 477023 INVITE
>
>
>
> Server: KAM
>
>
>
> Content-Length: 0
>
> Thanks,
> --Sergiu
>
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