Hi,

I discovered recently that, on Kamailio 5.5.4 at least, the dialog ’timeout_avp’ no longer appears to have effect.

Here are my (seemingly relevant) dialog parameters:

modparam("dialog", "enable_stats", 0)
modparam("dialog", "hash_size", 4096)
modparam("dialog", "rr_param", "dlgcor")        # DLG "correlator"
modparam("dialog", "dlg_flag", 2)
modparam("dialog", "default_timeout", 28800)    # 8 hours
modparam("dialog", "dlg_match_mode", 1)
modparam("dialog", "table_name", "dialog")
modparam("dialog", "send_bye", 1)
modparam("dialog", "wait_ack", 0)
modparam(“dialog”, “timeout_avp”, “$avp(dlg_timeout)”)

The flow is roughly like this:

request_route {
   ...

   t_check_trans();

   if(is_method(“INVITE”)) {
      ...

      dlg_manage();
      $avp(dlg_timeout) = 10;

      ...

      if(!t_relay())
         sl_reply_error();

      return;
   }

I was able to resolve the problem by switching to dlg_set_timeout() instead, but I wonder if there has been a regression. Last version I have on which this positively works is 4.4.7, though, so not sure when it might have broken.

One nuance: $avp(dlg_timeout) is not initialised prior to calling dlg_manage(), and the value is only set if certain conditions are true. Not sure if some stricter check appeared in later releases which could cause this to be a problem.

Thank you!

— Alex

--
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/


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