For this you will need RDNIS (redirecting number) support on your PRI trunks at the main and remote location.
a. Set your gateways to send RDNIS info inbound at HQ and outbound at remote site. You can select this option for an MGCP gateway under callmanager or for a h323 gateway under the pri d-channel interface in the router.
b. At the main site set a 10 digit PSTN number to map to Unity pilot number say 972-111-6000.
c. On the remote site phones, set the call forward destination for busy and no answer to 9 + 1 (if its long distance) + 9721116000 or 9 + 9721116000. (if its local call)
d. When somebody calls a remote site phone, and rings no answer or busy to voicemail, it will place a long distance or local call (as required) to the HQ site. The call will hit unity. Now how does Unity know which mailbox to dump the call into ? Thats where RDNIS is required to be sent from the remote site to the HQ via the PSTN. Only certain telco switches support passing RDNIS information between switches, so you will have to work with your telco to get support for that. From my experience, it works great with primary-ni switches.
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Edit: I posted this based off thinking about Callmanager in my head, so in case of CCME, all you need to do is set the voicemail pilot to 9 + 10 digit number of voicemail pilot and have the ephones call forward to the same pilot as well. RDNIS should take care of the rest.
One thing i forgot to add is that the setup i explained above will not help with MWI.
To dial MWI for CME phones, you can add a second cluster under your existing Unity integration with Callmanager and specify the CCME router's ip address. In this integration, allocate 2 - 8 ports for dialing mwi only. This mwi traffic will run over vpn, which should be a low overhead traffic. I am not sure if this is a supported configuration by TAC though.
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