[cisco-voip] Upgrading CallManager 3.3(3)

[Wes Sisk]

it's a YMMV.  Cisco only tested and development only supports 3.3(5) to 
4.2(1) so TAC will provide only nominal support on attempts to do 
directly from 3.3(3) to 4.2(1).

/Wes

Adam wrote:
> I need to upgrade a CallManager cluster from 3.3(3) to 4.2(1). The
> documentation says that I can only upgrade to 4.2(1) from 3.3(5). Is
> this non negotiable, or is it possible from 3.3(3) as well. If so
> approximately how long does it take for an upgrade of cluster with a
> publisher and a single subscriber with less then 100 phones? I'm
> trying to work out how many/long maintenance windows need to be
> scheduled.
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