[SR-Users] Manually add Via Header

[Daniel-Constantin Mierla]

You better use t_reply("487", "Cancelled") in a failure_route.

Adding a proper Via header might be a tricky task.

Cheers,
Daniel

On 10/25/12 11:43 AM, Vassilis Radis wrote:
> I have a situation where a far end SIP provider doesn't behave 
> properly when sending 487 replies. The scenario is this:
>
> I have a registered user calling into my kamailio which ,using lcr 
> module, routes the call to a SIP provider. When the caller Cancels the 
> call, my kamailio forwards the cancel message to the provider (along 
> with a 200 Cancelling message to the caller). The problem is with the 
> 487 sent by the provider to my kamailio: It does not contain all the 
> two Via headers. It only contains the via header that names my 
> kamailio. So when kamailio gets the 487, it removes its Via header and 
> sends the 487 back to the caller, which now doesnt find any via header.
>
> Note that the far end provider, correctly sends all the Via Headers in 
> other replies (183 etc).
>
> So now I am trying to "intercept" the 487 from this specific provider 
> in the onreply route, and patch it with the header that the provider 
> should have included. How can I do it? The problem is twofold:
> 1.I need to detect which header I should manually add (maybe store the 
> Via Header set from the initial invites or the 183 replies, and get it 
> from there? .I dont know how to do that)
> 2.I need to add it. (How can I manually add a Via header? .This seems 
> easier
>
> Can anyone help me, maybe with another solution?
>
>
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, Berlin, Nov 5-8, 2012 - http://asipto.com/u/kat
Kamailio Advanced Training, Miami, USA, Nov 12-14, 2012 - http://asipto.com/u/katu

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