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METHOD TO DETERMINE TG AND ENCRYPTION KEY FOR USE IN A SUBSCRIBER TO LAND INTERCONNECT CALL

IP.com Disclosure Number: IPCOM000007667D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-12
Document File: 2 page(s) / 81K

Publishing Venue

Motorola

Related People

Authors:
Hans Christopher Sowa Alan L. Wilson

Abstract

The system is a Project 25 conventional land mobile radio system using conventional talk groups (TG). Subscriber to Land Interconnect calls are ini- tiated by the subscriber and are routed through a digital interface unit (DIU) and a mobile radio tele- phone interface (MRTI). Security is provided by the DIU. The interconnect call starts with the subscriber sending an interconnect access message. The DIU/MRTI will respond to this with a dial tone. Then the subscriber sends dialing digits and the DIU/MRTI responds with a ring tone and the phone call is connected with voice communications to follow.