[OpenSIPS-Users] To tag in the CANCEL issue

[nz deals]

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:
>
>    1. My carrier sends the initial INVITE without a tag in the To header,
>    which I forward to a Cisco phone.
>    2. The Cisco phone responds with a 180 Ringing message, which includes
>    a tag in the To header.
>    3. 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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