[SR-Users] Dispatcher - failure_route to specific node

[Federico Cabiddu]

Hi,

I'm not sure that I fully understand your scenario, there are things not
clear to me, like: who is sending the 407? In your script snippets it seems
that upon receiving the 302, in the failure route you set the $du and then
you pass the message to a RELAY route, which I suppose sends the 407 reply.
If you don't need for special reasons that the user performs a proxy
authentication, in the failure route you could just relay the INVITE to the
target FreeSWITCH after setting $du to the value of your custom header.

Hope this helps.

Regards,

Federico
On 12 Sep 2014 09:05, "Nicholas Gill" <nick at etellicom.com> wrote:

> Hello sr-users,
>
> We're using Kamailio to proxy to a number of FreeSWITCH backend servers
> with the dispatcher module.
>
> In some specific scenarios it matters to which node the request is sent.
> In these cases we've configured FS to respond to the invite with 302 and
> provide a custom header which contains the uri of the needed backend server
> (Intending to emulate the behaviour of 305 Use Proxy).
>
> To attempt to handle this I've tried the following in kamailio:
>
> onreply_route[MANAGE_REPLY] {
> ...
>         if (t_check_status("302") and is_present_hf("X-imx-redirect"))
>         {
>                 $avp(imx-redirect) = $hdr(X-imx-redirect);
>                 xlog("SCRIPT: REDIRECT, Store avp for redirect:
> $avp(imx-redirect)\n");
>         }
> }
>
> Then in the dispatch failure route:
>
>         if ($avp(imx-redirect) != $null)
>         {
>                 $du = $avp(imx-redirect);
>                 xlog("SCRIPT: REDIRECT: going to <$ru> via <$du>\n");
>                 route(RELAY);
>                 exit;
>         }
>
> Which results in the following sip event sequence:
>
> // Normal invite sequence
> FS1 -> Kamailio SIP/2.0 302 Moved Temporarily (X-imx-redirect = sip:FS2...)
> Kamailio -> FS1 ACK
> Kamailio -> Caller SIP/2.0 407 Proxy Authentication Required
>
> Then the caller generates a new INVITE however I'm unsure how to route
> this INVITE to the specific node. The avp appears (intentionally) tied to
> the transaction so doesn't seem to be able to be used to correlate in this
> scenario.
>
> Advice on how to redirect from a backend server to another specific
> backend server behind Kamailio would be greatly appreciated.
>
> Cheers,
>
> -nick
>
>
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