SRST backup time during failoure of call manager

Answered Question
May 6th, 2008

Unified SRST which is embedded

within Cisco IOS Software to help provide high-availability IP telephony. This feature is usefull to provide backup to IP Phone during faliour of call manager.

I would like to know how long SRST can provide backup to IP phone?

Here we have cisco 3845 router with SRST bundle.

Awaiting for your response

I have this problem too.
0 votes
Correct Answer by rob.huffman about 8 years 7 months ago

Hi Manoj,

There is no "maximum" time that SRST can remain in effect. You hope that it isn't too long to CCM fixed, but SRST could work indefinitly. Here is a little clip from an excellent SRST Overview;

"Cisco Unified SRST overcomes this problem and ensures that the Cisco IP phones offer continuous (although minimal) service by providing call-handling support for Cisco IP phones directly from the Cisco Unified SRST router."

Cisco Unified SRST Description

http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_configuration_guide_chapter09186a00806674d2.html#wp1328133

Hope this helps!

Rob

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manojdubey02 Sun, 05/11/2008 - 00:36

i haven't received any response of my query...please suggest me on above.

thanks and regards,

manoj

Correct Answer
rob.huffman Sun, 05/11/2008 - 06:38

Hi Manoj,

There is no "maximum" time that SRST can remain in effect. You hope that it isn't too long to CCM fixed, but SRST could work indefinitly. Here is a little clip from an excellent SRST Overview;

"Cisco Unified SRST overcomes this problem and ensures that the Cisco IP phones offer continuous (although minimal) service by providing call-handling support for Cisco IP phones directly from the Cisco Unified SRST router."

Cisco Unified SRST Description

http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_configuration_guide_chapter09186a00806674d2.html#wp1328133

Hope this helps!

Rob

manojdubey02 Wed, 05/14/2008 - 00:19

I asked you these details becouse someone told me that it will provide backup only 8 hrs..

Thanks for your help

rob.huffman Wed, 05/14/2008 - 04:49

Hi Manoj,

You are most welcome my friend :) Luckily there is no "8 hour" type restriction. Have a look at this recent thread that does show why this (SRST) must continue to operate.

I feel for Kenneth and the people involved.

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=IP%20Telephony&topicID=.ee6c829&fromOutline=&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cc08df7

Take care,

Rob

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