The Merge/Isolate Cabinet is designed to operate in a multi-zone Page/Party® communication system. The cabinet selectively merges and isolates up to five zones that normally operate independently. Each zone's Page/Party® communication cable, which contains five party lines and one page line, is connected to the merge/isolate cabinet.

When merged, the zones share the page line and one party line. For example, two zones can be merged while the remaining zones are isolated and continue to operate independently. Voice pages generated from handset stations within one zone will be heard in both zones when the two zones are merged. A master desktop station that works in conjunction with the cabinet controls the actual merging and isolating of the zones. The cabinet supports a maximum of 16 master stations.