hi Paul

from my understanding from the above post, it sounds u have dial-plan and numbering issue

and gatekeep is not required for two reasons

firs it will not be responsible of numbering translation

secondly gatekeeper reponsible for CAC mainly if u have bandwidth limitations or policies then Gatekeeper ur choice,BUT in ur case wont work as well !! because i can see u have one CUCM.. while u need at least two CUCMs or CUCM with CME to make the gatekeeper make CAC if u look for CAC with on CUCM cluster then go to regions and locations way!!

and from ur description it is not good idea to make both site overlap

but as long as there is site prefix like 554 then its ok works fine

and with unity u need to rigister the phones with the site extention

if u have problem sending the site extention to unity make translation pattren

i havnt done it this way but try

for example lets say ur voice mail number is

1234

make translation pattren match 1234

and prefix to the calling number 554 for site one and 555 for site two

and make sur eu creat two transaltion pattren one for site A with partion only site A have access to and prefix 554

and another one for B with partion only B have access to and prefix 555

and for both translation pattrens make sure they have CSS that access the voice mail port partion

in unity phone 1000 site A should be 5541000

so when phone 1000 press the VM butten this butten assiciated VM profile that dial the VM pilot number in our example we said 1234

then will match the created translation pattren that A have access to and the calling number will be translated to 5541000 so wil match the number i unity

the same idea for B

good luck

if helpful Rate