[OpenSIPS-Users] To tag in the CANCEL issue

[nz deals]

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 <abalashov at evaristesys.com>
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 <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
> > _______________________________________________
> > Users mailing list
> > Users at lists.opensips.org
> > 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
>
>
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> Users at lists.opensips.org
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>
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