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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>“most of the reading I have done implies about 40 seconds is required to recognize failure of the primary, and initiate handoff to the subscriber.” – if I am reading correctly, you are talking about failover from the publisher callmanager to the subscriber callmanager. If this is the case typically it’s much faster than 40 seconds It’s a matter of a few seconds. It depends, however, on what all you have.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As a side note, Cisco recommends when you have more than one callmanager that you “home” your phones to the subscriber during normal operations and then allow the phones to failover to the publisher if the subscriber fails. Having the phones run off of the subscriber reduces the workload on publisher resources.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“should I keep SRST now that I will have redundant CMs?” – What is the likelihood that any building could lose connectivity to both CMs at the same time? If it is possible then your answer is yes. If you already have SRST it won’t hurt anything to leave it in place.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Go0se<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>My blog:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://atc.go0se.com">http://atc.go0se.com</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>--------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Help Hopegivers International<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Feed the orphans of Haiti and India<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.hopegivers.org">http://www.hopegivers.org</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>--------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On Behalf Of </b>David Zhars<br><b>Sent:</b> Sunday, December 12, 2010 9:28 AM<br><b>To:</b> cisco-voip@puck.nether.net<br><b>Subject:</b> [cisco-voip] Quick failover and SRST<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We have 7 buildings all connected via fiber. Each building has a 2801 for SRST and 911 handling.<br><br>As an upgrade, we are going to install a redundant CM (version 8.x). I have one site that needs quick failover, and most of the reading I have done implies about 40 seconds is required to recognize failure of the primary, and initiate handoff to the subscriber. I know there are some settings to speed this up as well.<br><br>My quesiton is, should I keep SRST now that I will have redundant CMs? Could they somehow assist in that 40 second timeframe, or are they sort of the subscriber when you don't have a redundant CM? What would I gain by keeping SRST with a redundant CM? <br><br>And I'm just curious, but how does Cisco license the redundant CM? Same prices and maintenance as a regular CM?<br><br>thank you!<o:p></o:p></p></div></body></html>