[Users] redundancy

[Ramin Dousti]

On 9/21/06, Steve Blair <blairs at isc.upenn.edu> wrote:
>

Hi Steve,

> In the proxy you can check the status of the t_relay and take corrective
> action based on the result. Something like "if (t_check_status("403"))
> ... do something... " should work. What action you take will depend upon
> the desired outcome. You could send the call to voicemail, a greeting
> server, a different gateway, etc.
>

Yes, that's exactly what I'm looking for. But there are some problems I'm
facing, which most probably is due to my own lack of understanding about
the available knobs:

1- When t-relay() return, the proxy already send the failure notice to
 the client. This is not what I want, the "corrective action" must be
transparant
to the user.

2-  I have two SRV's with the same weight, I do not see any kind of round-robin.
The request goes to only one of them.

Here is the (probably faulty) config:

route {
  ...
                rewriteport ("");
                #t_on_failure("1");
                xlog("L_INFO", "Got the call\n");
                if (! t_relay()) {
                       if (t_check_status("(403|487)|(408|477)")) {
                           xlog("L_ERR", "initial call failed\n");
                           if (t_newtran()) {
                             xlog("L_ERR", "Let's try again\n");
                             t_relay();
                           }
                       }
                }
 ...
}

Can you help?

Ramin

> In the phones you can use SRV records to present a weighted list of
> proxy servers. The phone would register to a domain name which is a SRV
> record. This record resolves into the A records for each viable proxy.
> You could weight and prioritize the A records thereby giving the phones
> an ordered list of servers to try.
>
> -Steve