SIP Dial-peer fail over timer command to secondary sip dial-peer

[Dominic Ellis]

Hi,

I was carrying out some testing yesterday with our provider.

We have 2 routes out to their 2 sip data centres.

They took the primary route down  so we could test that the backup route

to the secondary data centre worked ok in case of DR.

It worked - the call went through ok - but only after about 30 seconds of

trying the primary route.

Apparently there is a command to reduce the timer so that after only X seconds

the call will re-route to the backup route.

Does anyone know what that command is?

Regards

Dominic

[Terry Cheema]

You can tweak the number of retry and trying timer. Off the top of my head I think its 6 retries by default and timer doubling with each try.

Sip-ua
Retry invite 2
Timers trying x

Tweak above settings to get desired time.

Terry

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[Dominic Ellis]

Thanks Terry - I'll have a dig around.

Regards

Dominic

[Terry Cheema]

Not a problem mate. Please rate the useful posts and if you have no other queries please mark the thread as answered.

Terry

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[Jonathan Schulenberg]

You may also want to consider SIP OPTIONS PING as a keepalive mechanism to busy-out the dial-peer when the connection is lost. Without this, the timer must expire for each call.

dial-peer voice tag voip

  voice-class sip options-keepalive

Please remember to rate helpful responses and identify helpful or correct answers.

[Ayodeji Okanlawon]

+5 to Terry..Always good to see on the forum...guess you have been busy

+5 to Jonathan..Love your posts

Dominic,

Default SIP settings won't allow dial-peer failover to take place. The default number of SIP INVITE retries is 6 while the initial TRYING timer is 500 msec. In you case when the call arrive:

Initial SIP invite request

1st invite retry (delay to retry: ~500ms) 150ms

2nd invite retry (delay to retry: ~1sec)  300ms

3rd invite retry (delay to retry: ~2sec) 

4th invite retry (delay to retry: ~4sec)

5th invite retry (delay to retry: ~8sec)

6th invite retry (delay to retry: ~16sec)

Failover time to second UAS      (delay to failover: ~32)

Note: Time delay increases using the formula (2xOld Time)

The total time to failover is 63.5 seconds

If you change your config to something like this

sip-ua

retry invite 2

timers trying 150

Failover will happen after 2 retries with a retry time of 150ms instead of the default 500ms

For more information please refer to this doc

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a008082d76a.shtml

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

[Terry Cheema · Accepted solution]

good stuff guys. +5 each

Deji my friend I hope you are doing well.

Terry

[Dominic Ellis]

Terry - thanks that has been a great help.

Regards

Dominic

[Terry Cheema]

Dominic not a problem, glad that helped.

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