[SR-Users] TM module timer question

[Corey Edwards]

On 06/26/2012 08:36 AM, Gertjan Wolzak wrote:
> Which timer do I need to use to get a failure route to reroute the call
> to a pstn gateway?
> 
>  
> 
> I have tried the fr_timer which works, I set it to 5000, downside is
> that when I am in wifi range, I only have 5 seconds to answer the call.
> 
>  
> 
> The fr_inv_timer is not the right one I think, as I will not get any
> message from the called number, as that device is not connected….

I'm not an expert on this, but I'll post my experience and I hope that
helps. I'm using Kamailio 1.5, so perhaps YMMV.

I have fr_timer set to 2 seconds and fr_inv_timer set to 60 seconds. The
latter can be overridden by fr_inv_timer_avp so users can alter their
own timers. I do not let users change fr_timer.

The behavior I see is the device has 2 seconds to give a provisional
response to an INVITE. If the device has powered off, changed IP, etc.
this timer will quickly return an error.

If the device is responsive and, for example, sends a 180 Ringing, the
fr_timer ceases to apply and the fr_inv_timer waits 60 seconds before
giving up and triggering a 408 Timeout.

Corey