Thanks Alex. I raised this issue with Vendor support, and their suggestion was to include the To-tag in the CANCEL request, given that the 180 Ringing and 183 Session Progress responses from the Cisco phone include To-tags. Based on their feedback, they believe the absence of the To-tag in the CANCEL might be contributing to the rejection with a 481 Call/Transaction Does Not Exist error.
>From my observations, my SBC adheres to SIP standards, but since this behavior aligns with Vendor's recommendation and might help address the issue, I wanted to explore this approach as a potential workaround. Regards, Jason On Mon, 25 Nov 2024 at 17:46, Alex Balashov <[email protected]> wrote: > Hi, > > Initial INVITEs do not ever have a To-tag. So, the initial INVITE didn't > have a To-tag, not because of any quirk or eccentricity, but because > initial INVITEs aren't supposed to have To-tags. If the initial INVITE > being CANCEL'd doesn't have a To-tag, the CANCEL shouldn't have a To-tag. > The CANCEL should not have a To-tag. > > I suspect your theory of why the CANCEL is being rejected by the Cisco > phone is not correct. > > -- Alex > > > On Nov 24, 2024, at 10:42 pm, nz deals <[email protected]> wrote: > > > > Does anyone have any thoughts or input on this? > > > > Thanks > > > > Regards, > > Jason > > > > On Mon, 18 Nov 2024 at 10:20, nz deals <[email protected]> wrote: > > Hi Community > > I’m encountering a strange issue with CANCEL requests in my opensips > 3.4.2 setup. Here’s the scenario: > > • My carrier sends the initial INVITE without a tag in the To > header, which I forward to a Cisco phone. > > • The Cisco phone responds with a 180 Ringing message, which > includes a tag in the To header. > > • When I send a CANCEL request, my carrier does not include the tag > in the To header, and as a result, OpenSIPS also forwards the CANCEL to the > Cisco phone without the tag. > > Because of this, the Cisco phone responds with a 481 Call/Transaction > Does Not Exist error, and the call remains active on the phone without > being canceled. > > I’ve tried modifying the CANCEL request to include the tag in the To > header, but I wasn’t able to modify because the initial INVITE doesn’t have > a tag in the To header. > > Has anyone experienced a similar issue or found a way to fix this? Any > guidance would be greatly appreciated. > > > > Thanks > > > > Regards, > > Jason > > _______________________________________________ > > Users mailing list > > [email protected] > > http://lists.opensips.org/cgi-bin/mailman/listinfo/users > > -- > Alex Balashov > Principal Consultant > Evariste Systems LLC > Web: https://evaristesys.com > Tel: +1-706-510-6800 > > > _______________________________________________ > Users mailing list > [email protected] > http://lists.opensips.org/cgi-bin/mailman/listinfo/users >
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