[OpenSIPS-Users] dispatcher "fail-over" doesn't seem happy

[Bogdan-Andrei Iancu]

Hi Jock,

I guess the problem is detecting the failure . The failure route catches 
only SIP failures (like you sent the requests and you get nothing or 
negative reply); but failure route does not catch sending error (like in 
your case).

So, you should do something like:

route[try_next] {
    here put the next stuff
}


{
    ...
    t_on_failure("sip_failure");
    if (!t_relay()) {
        xlog("L_WARN", "[$Tf] t_relay fail\n");
        route(try_next);
    } 
    ...
}


failure_route[sip_failure]
{
    if (t_check_status("....") {
       # is a destination failure
       route(try_next);
    }
}


Regards,
bogdan


Jock McKechnie wrote:
>
>
> On Thu, Apr 1, 2010 at 10:26 AM, Brett Nemeroff <brett at nemeroff.com 
> <mailto:brett at nemeroff.com>> wrote:
>
>     Where is your failure route? :)
>     -Brett
>
>
> I intentionally chose to not include it, along with the other 200 
> lines of config, for simplicity, but you're right, given this is a 
> failure, I clearly should've, duh :)
>
> failure_route[2] {
>         if (t_was_cancelled()) {
>                 xlog( "L_NOTICE", "[$Tf] FR: transaction cancelled - 
> exiting\n" );
>                 exit;
>                 }
>
>         # If fr_timer expires t_check_status("408") is true, although 
> $rs is <null>
>          if( t_check_status("408") ){
>                 xlog( "L_NOTICE", "[$Tf] FR: $ci -- TIMEOUT for 
> Gateway $rd\n" );
>          } else {
>                 xlog( "L_NOTICE", "[$Tf] FR: $ci -- $rs reason $rr\n" );
>                 }
>
>         # 403 -- typically ISDN network says 'not a valid number' etc..
>         if( t_check_status("403") ){
>                 xlog("L_WARN", "[$Tf] FR: $ci -- SIP-$rs Forbidden -> 
> ISDN Cause Code 1\n" );
>                 return;
>                 }
>
>         if( ds_next_domain() ){
>                 xlog( "L_NOTICE", "[$Tf] FR: $ci Next gateway $fU -> 
> $tU via $rd \n" );
>
>                 t_on_failure("2");
>
>                 if( !t_relay() ){
>                         xlog( "L_WARN", "[$Tf] FR: $ci -- ERROR - 
> Cannot t_relay() -- $fU -> $tU via $rd\n" );
>                         return;
>                         }
>                 return;
>         } else {
>                 xlog( "L_WARN", "[$Tf] FR: $ci No more gateways -> 
> 503.\n" );
>                 t_reply("503", "Service unavailable -- no more 
> gateways" );
>                 return;
>                 }
>
>         }
>
>  - Jock
>
>
>  
>
>     On Thu, Apr 1, 2010 at 11:20 AM, Jock McKechnie
>     <jock.mckechnie at gmail.com <mailto:jock.mckechnie at gmail.com>> wrote:
>     > Greetings all;
>     >
>     > I'm attempting to set up a fail-over only scenario using
>     dispatcher and am
>     > encountering some problems. I'm using dispatcher since we're already
>     > utilising it for load balancing, so it makes sense to reuse the
>     tool, and
>     > according to the OpenSIPS 1.6 dispatcher module documentation it
>     supports
>     > fail-over.
>     >
>     > If the destination server is running, everything works as
>     expected - algo 8
>     > (which OpenSIPS logs as not found and defaulting to the first
>     entry) pushes
>     > the call to the first server at all times. However if I block
>     the route to
>     > the destination server like so:
>     > /sbin/route add -host 192.168.0.99 reject
>     > Then instead of failing over I get a SIP 477 (Send failed) error.
>     >
>     > The chunk of routing looks like so:
>     >
>     > xlog("L_WARN", "[$Tf] Found failover, working on set: 1101\n");
>     > if (!ds_select_domain("1101", "8")) {
>     >     t_reply("503", "Unable to locate failover set requested");
>     >     return;
>     >     };
>     >
>     > route(1);
>     > };
>     >
>     > route[1] {
>     > t_on_failure("2");
>     >
>     > xlog("L_WARN", "Attempting to relay call to $ru\n");
>     >
>     > if (!t_relay()) {
>     >     xlog("L_WARN", "[$Tf] t_relay fail\n");
>     >     return;
>     >     }
>     > return;
>     > }
>     >
>     >
>     >
>     > The log contains:
>     > [Thu Apr  1 11:14:35 2010] Found failover, working on set: 1101
>     > WARNING:dispatcher:ds_select_dst: algo 8 not implemented - using
>     first
>     > entry...
>     > Attempting to relay call to sip:+12125551212 at 192.168.0.99:5060
>     <http://sip:+12125551212@192.168.0.99:5060>
>     > ERROR:core:udp_send:
>     sendto(sock,0xb3b9bd28,1039,0,0xb3ba2cf4,16): Network
>     > is unreachable(101)
>     > ERROR:tm:msg_send: udp_send failed
>     > ERROR:tm:t_forward_nonack: sending request failed
>     > [Thu Apr  1 11:14:35 2010] Found failover, working on set: 1101
>     > WARNING:dispatcher:ds_select_dst: algo 8 not implemented - using
>     first
>     > entry...
>     > Attempting to relay call to sip:+12125551212 at 192.168.0.99:5060
>     <http://sip:+12125551212@192.168.0.99:5060>
>     >
>     > This suggests to me that instead of failing over it's simply
>     retrying the
>     > first entry, which it shouldn't be, and after finding it out for
>     a second
>     > time (and thus exhausting the two-entry set), gives up.
>     >
>     > Any thoughts?
>     >
>     >  - JP
>     >
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>     >
>     >
>
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-- 
Bogdan-Andrei Iancu
www.voice-system.ro