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
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