Hello,

On 6/27/12 6:08 PM, Corey Edwards wrote:

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.

it is the same in 3.x, these two parameters are the right to be used in this way.

Have in mind that in 3.x the accuracy is in milliseconds:

http://kamailio.org/docs/modules/stable/modules/tm.html#fr_timer

Another new features in 3.x is that apart of using avps to set it per transaction (still in seconds), there is a new function that can be used to set it in milliseconds per transaction:

http://kamailio.org/docs/modules/stable/modules/tm.html#t_set_fr

Cheers, Daniel