John W. Maher

Method for establishing and maintaining communication processing information for a group call

Communication system network that includes full duplex conference calling

Methods for implementing a talkgroup call with competing sources in a multicast ip network

Method for pre-establishing communications in a wireless communication network

Distributed fault isolation and recovery system and method

Methods for reliably sending IP multicast packets to multiple endpoints of a local area network

Multicast IP zones for fast spanning tree convergence in wide-area packet network systems

Radio console with CRT display

Database management system having first and second databases for automatically modifying storage structure of second database when storage structure of first database is modified

Communication system network having communication system fallback operation