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

Bogdan-Andrei Iancu bogdan at opensips.org
Wed May 22 04:36:56 EDT 2019

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.


Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
OpenSIPS Summit 2019

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.
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> Users at lists.opensips.org
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