[Users] t_relay to multiple path

Bogdan-Andrei Iancu bogdan at voice-system.ro
Tue Nov 15 13:13:35 CET 2005

Hi Jayesh,

trusting the source ip may not be save due IP spoofing...you may try to 
increase the security by using TCP (instead of UDP) or the best, to use TLS.

regarding the gateway chaining, please refer to a similar example:
or cvs path

for setting the timeout, see


Jayesh Nambiar wrote:

> hi everyone,
> In my configuration, I trust some source ips and if call comes from 
> these src ips, without any authentication they are t_relayed to a 
> gateway ip address for pstn termination.
> Is there any potential problems by trusting some clients by src_ips, I 
> do so as I dont want them to login from anywhere else.
> I also wanted to know that if I do not get reply from a particular 
> gateway, can I forward them to another gateway. I dont want to use LCR 
> for this. I thought of using failure route, but the call does not fail 
> it keeps on sending invite.
> What I wanted to do is, if I dont get a reply within 5 seconds, it 
> will try the next t_relay_to_udp statement.
> the logic goes something like this:
> if(allow_trusted()) {
>         if(uri=="sip:011...") {
>               t_relay_to_udp("to a pstn gateway");
>                # if no reply for 5 seconds
>               t_relay_to_udp("to another gateway)
>               break;
>         };
> };    
> can somebody pls help on this. I am currently using 0.9.5 and will 
> soon be upgrading to 1.0.0.
> Thanks a lot in advance
> Jayesh
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