[OpenSIPS-Users] To tag in the CANCEL issue

[nz deals]

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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