Upgrading UCS hosts running Call Manager

Hi all,
I have a client who currently runs CUCM etc on a UCS host running ESXi 4.1.
The client has upgraded their entire vurtualisation platform to ESX 5.0 and want to connect the CUCM UCS hosts to vCentre.
We have explained the pro's and con's of managing the UCS hosts in vCentre, but they want to pursue it.
My question is, what do i have to do to upgrade the UCS hosts to ESXi 5.0 without causing any serious issues with CUCM and other apps?
do i need any specific licenses to include the ESXi hosts to vCenter once i upgrade.
I dont know where the ESXi lice4nses are coming from, whether through an existing VMware agreement or OEM through Cisco.
Cheers
Darren

Thanks Jonathan,
I'm still looking for a best practice process for upgrading the hosts to ESXi 5. usually we can just vmotion the VM's, put the host into maintanence mode and go on our merry way. As CUCM doesnt support vmotion, is there a way without impacting the CUCM (and other applications) VM's.
Im aware that I can shut down CUCM and the other application VM's and upgrade the hosts
I'll look into the license for the vCenter integration. Ive done this with BE6K so I'll assume its the same.
Cheers

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Upgrading UCS hosts running Call Manager

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