US Patent 10560825 Digital intercom system having multiple master stations

A digital intercom system has first and second master stations. Each master station has hardware and software configured to allow duplex communication between a plurality of communication devices. The software is further configured to run a plurality of settings for directing communication between the communication devices of each master station. The master stations are configured to allow duplex communication between the devices of each master station. Inter-master channels define parameters for communication between the communication devices of each master station. The settings of the master stations can be modified based on input entered into a browser based program run on a first input/output device by a user.