Have System Option license 87, Record-A-Call.
Verify in Form 2 there is a access code for Send Message
In COS of the VM ports and extensions, enable Option 268
In Hunt Groups, go the VM HG, then Options, and set the maximum number of RAC ports
In Call Reroute Table enter the RAC VM Destination for the Tenant.
On the sets, program a Record-A-Call key
It is spelled out step by step in the system documentation under the Record-A-Call Feature section.