with unity the vocemail box will based on exchnage in ur case so better to have then coresedant in the same LAN
if u can u need callmanager to be in the same LAN as well
u can have it in a remote site but ur dial-paln will be harder in case of the WAN connection gose down
u need to consider that with voicemail u gonna use g711 codec then each call will take 64k but if u configuring ur CAC through CUCM then each call need 80k with IOS GK CAC needs 128k this is with g711 codec
calles between sites over wan u can use g729 with IOS GK CAC 16k with CUCM 24K
if u use g729 between site and users wanna go to unity that use g711 codec u need hardware transcoding then u need to consider DSP resources for this reason
loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
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