[Users] redundancy

[Greg Fausak]

Ramin,

Search the archives for serialize_branches(), next_branch(), etc..

First, I think you want to do an enum lookup before the t_relay().
With any luck, the result can be serialized using serialize_branches(),
I haven't tried this, but it makes sense.  Then you set t_on_failure(1) to
catch the subsequent t_relay() failure.  Finally, you need to write
failure function to load the next branch (if any) with
next_branches(), set another
on failure, then t_relay().

I looked around in the archives, there are examples with serial/next
with redirect,
but I didn't see any with srv records...should work though.

-g


On 9/21/06, Ramin Dousti <dousti at gmail.com> wrote:
> 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
>
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-- 
Greg Fausak
greg at thursday.com