[SR-Users] Timeout between 100 & 183

[Alex Balashov]

Hi,

On Fri, Apr 05, 2019 at 04:31:42PM +0000, Nicolas Breuer wrote:

> Any plans to add a timer for the timeout between 100  & 183 ??
> 
> https://lists.kamailio.org/pipermail/users/2007-December/014752.html
> 
> That can be useful in case we receive an auto_100 but nothing after that.
> Waiting the fr_inv_timer is not an option 😊

Despite appearances to the contrary, such a timer would be somewhat
redundant, though perhaps that's not accounting for ease of use. 

You can change `fr_timer` and `fr_inv_timer` dynamically:

   https://kamailio.org/docs/modules/5.2.x/modules/tm.html#tm.f.t_set_fr
   https://kamailio.org/docs/modules/5.2.x/modules/tm.html#tm.f.t_reset_fr
   https://kamailio.org/docs/modules/5.2.x/modules/tm.html#tm.p.fr_timer_avp
   https://kamailio.org/docs/modules/5.2.x/modules/tm.html#tm.p.fr_inv_timer_avp

This gives you the tools to accomplish what you want already. :-)

   modparam("tm", "fr_timer", 3000) # 3 seconds
   modparam("tm", "fr_inv_timer", 90000) # 90 seconds

   route {
      ...

      # Initial INVITE handling:

      if(is_method("INVITE")) {
         # Set fr_inv_timer initially to 5 seconds, so that
	 # if we do not receive an answer or at least one non-100 1xx
	 # response, trigger a failure_route and try the next gateway
	 # or whatever.

         t_set_fr(50000);

	 t_on_reply("REPLY_ROUTE");

	 if(!t_relay())
	    sl_reply_error();

	 exit;
      }
   }

   onreply_route[REPLY_ROUTE] {
      # 100 Trying responses are hop-by-hop and do not trigger an 
      # onreply_route.
      #
      # Reset fr_inv_timer back to default 90 sec now that we have
      # received a 180 or 183 to indicate progress/alerting.

      if(is_method("INVITE") && t_check_status("180|183"))
         t_reset_fr();
   }


Hope that helps!

-- Alex

-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
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