[OpenSIPS-Users] CANCEL in t_relay() not forwarding user defined Headers

[Bogdan-Andrei Iancu]

Hi Rahul,

As per RFC3261, the stateful CANCELs are hop-by-hop - which means each 
hop consumes the incoming CANCEL and generates a new one for the next hop.
This is why the headers do not propagate.

What kind of headers are looking to be passed further ?

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 06.05.2015 20:45, Gupta, Rahul wrote:
>
> I am using opensips as a proxy, when a CANCEL to an INVITE comes in, 
> its processed as follows
>
>         # CANCEL processing
>         if (is_method("CANCEL"))
>         {
>                 if (t_check_trans())
> t_relay();
>                 exit;
>         }
>
> in t_relay() seems like its creating new transaction for CANCEL and 
> forwarding to the destination. However its not copying user-defined 
> Headers which comes as a part of CANCEL. Is there a way to forward the 
> other Headers ?
>
> I also tried using forward(). In this case, all the headers are 
> getting forwarded, however, the branch in Via header is getting 
> duplicated from the incoming VIA header which is causing issues with 
> the endpoint.
>
> Question 1) If I use t_realy() for CANCEL, then how do I forward user 
> defined Headers ?
> Question 2) If I use forward() for CANCEL, then how do I get the Via 
> Header with proper branch as created in INVITE ?
>
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