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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>No 8.5.1 love? </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><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'>Failover time for a phone can be very quick if you are you the geometric TCP failover:<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><a href="http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/firmware/8_4_2/english/release/notes/79x5x2_842.html#wp185934">http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/firmware/8_4_2/english/release/notes/79x5x2_842.html#wp185934</a><o:p></o:p></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'>How fast you ask? VERY fast! </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> No, seriously, could be less than a second or two given good network conditions. GWs are a slightly different story. An MGCP GW will act more like one of the phones in terms of its style of failover. An H323 or SIP GW however don’t keep active TCP connections up with UCM and UCM doesn’t keep active TCP connections with the GWs, so it’s a timeout to pass calls to an alternate.<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'>Actually, in CUCM 8.5 we add a SIP option called PING which allows CUCM to stop use of a SIP GW if it stops responding to the PING command. That way we don’t wait for the timeout before proceeding to the next GW. Either way, the timeout is something you can play with and tune to make sure you allow for your network’s latency and to make sure you aren’t waiting 30 seconds for a call to try the next GW or UCM. H323 vs SIP will yield different results and within SIP, you can choose TCP or UDP and that will also affect your failover results. But they are all customizable.<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'>+Chris<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hosted Collaboration Solution TME<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> Friday, December 17, 2010 10:46 AM<br><b>To:</b> cisco-voip@puck.nether.net<br><b>Subject:</b> [cisco-voip] CCM Cluster Failover TImes<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Upgrading to CM 8.0 in a week. We will install a Pub/Sub setup.<br><br>Wondering what the failover times are typically (assume an unexpected failure of Pub). <br>I have been told variously that it's instant, and that it's a minute or so.<br>Does failover time vary based on gateway type (H.323 versus MGCP)?<br><br>Thanks.<o:p></o:p></p></div></body></html>