[OpenSIPS-Users] Call-id issue in Cancel message generated by tm / $T_fr_inv_timeout

[Julian Santer]

Hi guys,

we seem to got the same issue like John Nash on 2015/08/12.
We use OpenSips 2.1.2 with the latest revision from git repo.

Like John we are not sure if it is a bug or our mistake ;-)

We are using topology hiding and the Call ID in the CANCEL, generated by the TM module, is not the same, as the call ID in the initial INVITE.

The call flow looks like:
PSTN carrier -> gw-carrier (topo hiding) -> core (topo hiding) -> gw-consumer (topo-hiding) -> UAC consumer

The CANCEL generated by the TM module of the core, sended to the gw-consumer is rejected by the gw-consumer.

The CANCEL starts on the core. So let me show you
1) the initial INVITE, which the core receives from the gw-carrier (Call-ID: GW-CARRIER)
2) the initial INVITE, which the core and sends to the gw-consumer (Call-ID: Core)
3) the CANCEL generated by the core after $T_fr_inv_timeout (Call-ID: GW-CARRIER)

1)
INVITE sip:12345 at IP_CORE SIP/2.0
Via: SIP/2.0/UDP IP_GW-CARRIER:5060;branch=z9hG4bK6aa2.7710f555.0
From: <sip:+396789 at domain>;tag=E3AE5C5C-1A42
To: <sip:12345 at domain>
Call-ID: GW-CARRIER_EjJFKHdkNlktdGM2RV93ZV5MWHdlS0wvAn1HN14LYjFHLgRiXU1aHGdCWlcE
CSeq: 101 INVITE
Max-Forwards:  8
Remote-Party-ID: <sip:+396789 at IP_CARRIER>;party=calling;screen=yes;privacy=off
Contact: <sip:+396789 at IP_GW-CARRIER;rdlg=3db.94186637>
Expires: 180
Content-Type: application/sdp
Content-Length: 474
sdp ...

2)
INVITE sip:12345 at IP_UAC:PORT_UAC SIP/2.0
Via: SIP/2.0/UDP IP_CORE:5060;branch=z9hG4bK45da.82f6fd55.0
Route: <sip:IP_GW-CONSUMER;lr>
From: <sip:+396789 at domain>;tag=E3AE5C5C-1A42
To: <sip:12345 at domain>
Call-ID: Core_ExwGCwAcKhgvdAgnFg58LwQGAXUOXSAzC3A1JFB/FCcWCWFzGAQkXHInPFQGDzYYI3oPCCAMahZeEy11JywlCVEG
CSeq: 101 INVITE
Max-Forwards:  7
Remote-Party-ID: <sip:+396789 at IP_CARRIER>;party=calling;screen=yes;privacy=off
Contact: <sip:+396789 at IP_CORE;rdlg=28e.bad6c124>
Expires: 180
Content-Type: application/sdp
Content-Length: 426
sdp ...

3)
CANCEL sip:12345 at IP_UAC:PORT_UAC SIP/2.0
Via: SIP/2.0/UDP IP_CORE:5060;branch=z9hG4bK45da.82f6fd55.0
From: <sip:+396789 at domain>;tag=E3AE5C5C-1A42
Call-ID: GW-CARRIER_EjJFKHdkNlktdGM2RV93ZV5MWHdlS0wvAn1HN14LYjFHLgRiXU1aHGdCWlcE
To: <sip:12345 at domain>
CSeq: 101 CANCEL
Max-Forwards: 70
Route: <sip:IP_GW-CONSUMER;lr>
Reason: SIP;cause=480;text="NO_ANSWER"
User-Agent: OpenSIPS (2.1.2 (x86_64/linux))
Content-Length: 0

Kind regards,
Julian Santer
Raiffeisen OnLine