RE: [Users] Openser 1.1 and Dispatacher Failover - sr-users

6 Jun 2006

Thanks Carsten.

What does ds_next_domain() do? Is failure_route[1] supposed to be calling itself? Why
don't you call ds_next_dst() instead? 

Douglas.

...
  -----Original Message-----
 From: Carsten Bock [mailto:openser-list@qbiz.de]
 Sent: Tuesday, June 06, 2006 9:47 AM
 To: Douglas Garstang
 Cc: Users(a)openser.org
 Subject: Re: [Users] Openser 1.1 and Dispatacher Failover

 Hi Douglas,

 It's quite simple. Here an except from a possible Main-Route:

     [...]
     # Choose a Proxy (Round-Robin, PSTN-Gateways)
     ds_select_domain("2", "4");

     # On Failure: Choose next Proxy
     t_on_failure("1");

     # Relay to the Proxy
     if (!t_relay()) {
         sl_reply_error();
     }
     [...]

 And here the corresponding failure-route:
 failure_route[1] {
     # Choose another gateway
     if (t_check_status("408")) {
         if (ds_next_domain()) {
             # On Failure: Choose next Proxy
             t_on_failure("1");
             # Relay to Proxy
             t_relay();
         } else {
             t_reply("503", "Service not available");
             return;
         }
     }
 }

 And here the modparam for the dispatcher:
 # Dispatcher: Enable Failover-Support
 modparam("dispatcher", "flags", 2)
 That's it.

 Carsten

 Douglas Garstang schrieb:
  Carston.

 Thanks for the info. Unfortunately, none of this stuff is   documented. I really
don't have a clue how to implement any of this.

 Douglas.

  -----Original Message-----
 From: Carsten Bock [mailto:openser-list@qbiz.de]
 Sent: Tuesday, June 06, 2006 9:34 AM
 To: Douglas Garstang
 Cc: Users(a)openser.org
 Subject: Re: [Users] Openser 1.1 and Dispatacher Failover

 Hi Douglas,

 Yes you're right, it does. You just cannot do a simple (stateless) 
 forward for failover, you need to establish a transaction (e. g. 
 t_relay()) and you need a failure-route handling the error 
 (if there is 
 any error). And don't forget the flags of the dispatcher 
 (Flag 2 needs 
 to be enabled).

 Carsten

 Douglas Garstang schrieb:

  I was under the impression that the dispatcher
module in 
         Openser 1.1 did failover?

  I just tried it. I put an invalid IP in my
dispatcher.list 
         file. When the dispatcher selects that invalid IP, it looks 
 like it never times out and tries another. 

  # PSTN
 2 sip:216.187.140.217 # INVALID
 2 sip:216.187.141.246
 2 sip:216.187.140.216

 What special steps do I need to take to ensure the 
         dispatcher does failover?

  Here's a piece of my openser.cfg file...

         #
         # Outgoing PSTN Calls - Dispatch to Audiocodes
         #
         if (    src_ip == 216.187.142.203 || 
                 src_ip == 216.187.142.204 ||
                 src_ip == 216.187.142.232 ||
                 src_ip == 216.187.142.201 ||
                 src_ip == 216.187.142.231 ) {
             sl_send_reply("100","Trying");
             xlog ("L_INFO","Outbound PSTN call. Dispatching 
         to Audiocodes");

ds_select_dst("2","0");
             forward();
             return;
 	  }

 Doug.

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