E.f. Johnson Company

Transcrypt International/e. F. Johnson Company

Transcrypt Internationall E. F. Johnson Company

Transcrypt International/e.f. Johnson

Rory A Smith

Keith W Barnes

Mervin L Grindahl

Dana Lynn Simonson

John Livdahl

An Internet protocol (IP) packet switching communication system using real time transport protocol (RTP). Control packets map group identification codes to a multicast address on a network. Control packets are distributed on the network using simple object access protocol (SOAP) messages with extensible markup language (XML) payloads. Mapping may include dynamic or static functions. Multicast address data is distributed among routers. A message from a caller is multicast by the routers, based on the multicast address, to one or more destinations.

System and method for multicast communications using real time transport protocol (RTP)

A system for channel assignment in a trunked transmission communication system including a plurality of subscribers. A plurality of subscribers is provided home channel assignment to reduce collisions. A home channel alias is provided for home channel coverage where a designated home channel is unavailable. A system for call grouping is provided to avoid talk group splitting. A first check is used to determine if other channels are conducting communications with identical home and talk group information. A second check is available after a temporary channel assignment. In one system both the home channel aliasing and call grouping are performed.

Trunked radio repeater communication system including home channel aliasing and call grouping

A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interconnecting the trunked transmission communications systems into a wide area network that provides an expanded feature set of radio communications capabilities. The trunked radio repeater system including a protocol supporting communications for repeaters and/or subscribers conducting communications using existing protocols, such as the Logic Trunked Radio (LTR) protocol and supporting additional special functions.

Trunked radio repeater communication system

Method and apparatus for trunked radio repeater communications with backwards compatibility

Growing community of inventors

Waseca, MN, United States of America

Rory A Smith