[OpenSIPS-Users] To tag in the CANCEL issue

[Alex Balashov]

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 <nzdealshelp at gmail.com> wrote:
> 
> Does anyone have any thoughts or input on this?
> 
> Thanks
> 
> Regards,
> Jason
> 
> On Mon, 18 Nov 2024 at 10:20, nz deals <nzdealshelp at gmail.com> 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
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-- 
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800