The first floor tenant has a Partner ACS system with Partner VS voicemail module and some 308 adn 400 modules in a 5-module cabinet. The upstairs tenant has a similar Partner ACS system. The upstairs tenant is moving out and sold its phone system to the first floor tenant, who is expanding into the second floor. He wishes to have one phone system for both floors. How can I leave the two separate Partner cabinets and their modules in place and combine them into one system?

Vaya con Dios amigos!
Butch