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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'>The phones don’t really know about the CallManager’s ICCS traffic being down unless they were registered across the WAN link and will re-register if the CallManager Group has the server in its list. Features that rely on the Publisher would be down but these are fewer and fewer. For example older versions of CallManager the CallFwdAll button required Publisher access.<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'>Dialing out from Branch would give fast busy, inbound would just go to voicemail if configured.<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'>I would do a lot of controlled testing so you know what works/doesn’t., expected results during failure.<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>Ovidiu Popa<br><b>Sent:</b> Wednesday, April 06, 2011 11:52 AM<br><b>To:</b> cisco-voip<br><b>Subject:</b> [cisco-voip] CUCM split brain question<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello everyone<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Here's an unusual scenario that kind of puzzles me.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Here are the details:<o:p></o:p></p></div><div><p class=MsoNormal>- 2 CUCM with Clustering over WAN (HQ and Branch)<o:p></o:p></p></div><div><p class=MsoNormal>- Centralized PSTN Access at HQ (DID numbers routed to HQ)<o:p></o:p></p></div><div><p class=MsoNormal>- 1 phone with the Branch CUCM as primary and the HW CUCM as secondary<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Disaster strikes, the WAN link goes down and we have a split brain condition.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>What is the state to the phone on HQ CUCM? Will the phone be Unregistered or state Unknown?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>And the most important question is will the HQ CUCM follow the CFUR if the state is Unknown?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks for your input.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Regards,<o:p></o:p></p></div><div><p class=MsoNormal>Ovidiu<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>
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