I am researching into upgrading my CUCM 7.1.3 evironment to 9.1.x. I understand Cisco recommends that all IOS gateways should be running IOS release 15.x. for CUCM 9.1.x. The scenario with me is that most of my routers/voice gateways are on 12.4 and some older ones are supported on IOS 15.x. Is this really a must have requirement for CUCM 9.1.x ? I have both H323 and MGCP gateways in my environment.
On some of my older routers I have NM-HD-2V with VIC2-4FXO. Does CUCM 9.1.x support these modules ? Any issue with first generation PVDM ?
Thanks all in advance !! I appreciate any inputs / suggestions !!
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