[SR-Users] How to Absorb First Leg Re-Invites when no Response from Second Leg Invites

[YASIN CANER]

Hi,

In addition , there is a function in tm that helps to understand  branch timeout reason

https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_branch_replied

Yasin Caner

Alex Balashov <abalashov at evaristesys.com<mailto:abalashov at evaristesys.com>> şunları yazdı (2 Mar 2019 02:23):

Hi,

Reinvites are in-dialog requests; they would only be sent within the
context of an established dialog (2xx response, end-to-end ACK, the
whole works).

Perhaps what you are referring to is not reinvites but retransmissions
of the initial INVITE?

If so, have a look at this option:

https://kamailio.org/docs/modules/5.2.x/modules/tm.html#tm.p.cancel_b_method

in concert with something like this:

  failure_route[...] {
      if(t_is_canceled())
          exit;

      # The scenario you're after.

      if(t_branch_timeout()) {
          t_reply("503", "Service Unavailable");
      exit;
      }
  }

-- Alex

On Fri, Mar 01, 2019 at 08:23:11AM -0600, JR Richardson wrote:

Hi All,

My mind is not right on this one, need a pointer. Here is the simple scenario:
Carrier><kamailio proxy><end device
The end device is a static IP, the proxy dips database and knows where
to send numbers destined for the end device, but if there is no
response from the end device (it's off-line), how do I time-out the
transaction and send a 503 'Service Unavailable' back to the first leg
for the carrier to stop re-invites?

I assume I need a new [FAIL_TWO] route that handles this event.

Thanks.

JR
--
JR Richardson
Engineering for the Masses
Chasing the Azeotrope

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--
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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