Unity Connection Cluster - Delay answering after failover

Unanswered Question
Jun 18th, 2010

Unity Connection 7.1.5 servers in HA with SIP trunk integration to CUCM
6.1.3.  I am testing the failover and after unplugging the subscriber server
there is an initial delay before the publisher began accepting calls (which is
normal).

But once it is failed over it takes approximately 4 seconds after pressing
the messages key before the publisher server answers.  From speaking with
another engineer, I don't believe this is normal.

I have a TAC case open and they say it could be SIP timeouts.  Has anyone else
seen this?  Is it normal?  I may need to switch to SCCP if the customer finds
this unacceptable.

Thanks.

I have this problem too.
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dave.yeskey Fri, 06/18/2010 - 13:43

Thanks for the link.  And I don't think the support forums and TAC are mutually exclusive.

dave.yeskey Mon, 06/21/2010 - 10:28

On the SIP Profile for the Connections trunk lower Retry INVITE parameter.  The Integration Guide

says to enter a value of 5 or less but doesn't give an explanation why.  I set it at 2 and now there is

no delay.

rob.huffman Tue, 06/22/2010 - 05:43

Hi Dave,

Thanks for posting back with your results here (+5 points for this

great follow-up!)

Cheers!

Rob

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