[OpenSIPS-Users] Error on 487 Cancel - no 'to' tag

Yury Kirsanov y.kirsanov at gmail.com
Wed May 22 05:39:45 EDT 2019

Hi Bogdan,
Nice to hear from you again, you are always very helpful :)
Unfortunately, I doubt that Microsoft would listen to my request, they're
bending RFCs the way they like it, for example - using FQDN in 'Contact'
field and no 'to' tag in this 487 reply. I assume it's quite safe to ignore
this behaviour? Thanks!


ср, 22 мая 2019 г. в 18:37, Bogdan-Andrei Iancu <bogdan at opensips.org>:

> Hi Yury,
> No need to call any script function - all you need to do is to point your
> carrier to read the RFC3261 -> any final SIP reply MUST have a TO-tag.
> Regards,
> Bogdan-Andrei Iancu
> OpenSIPS Founder and Developer
>   https://www.opensips-solutions.com
> OpenSIPS Summit 2019
>   https://www.opensips.org/events/Summit-2019Amsterdam/
> On 05/22/2019 11:19 AM, Yury Kirsanov wrote:
> Hi,
> My upstream carrier is replying back to CANCEL request with a 487 Call
> Cancelled message that doesn't have a 'to' tag in its headers. So, I'm
> getting these errors in OpenSIPS logs:
> ERROR:dialog:push_reply_in_dialog: [487] reply in dlg state [2]: missing
> TAG param in TO hdr
> But dialogs are closing correctly on BYE and I don't see any dialogs
> hanging in any state when the call is finished. Is it something I should be
> worried about or can I just ignore this error? Is there any way to avoid it
> by OpenSIPS script processing logic? Maybe I need to call some function to
> fix this dialog? Thanks!
> Regards,
> Yury.
> _______________________________________________
> Users mailing listUsers at lists.opensips.orghttp://lists.opensips.org/cgi-bin/mailman/listinfo/users
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