×

Direct inward dial telephone number recognition in a land mobile radio system

  • US 5,678,176 A
  • Filed: 06/10/1994
  • Issued: 10/14/1997
  • Est. Priority Date: 06/10/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for establishing a duplex voice communication channel between first and second users in a trunked land mobile radio communication system which has a cell site that includes a plurality of repeaters and each user has a radio with an identification code and certain users have a DID telephone number, the method comprising the steps of:

  • receiving at said cell site through a first of said repeaters a telephone number which has been transmitted by said first user'"'"'s radio wherein said telephone number is the telephone number for said second user,determining that said telephone number is a DID telephone number,selecting one of said identification codes by use of said received DID telephone number,selecting a second of said repeaters,transmitting said one unique identification code through said second of said repeaters,receiving at said cell site through said second repeater from the second user'"'"'s radio a response to said transmission of said one unique identification code, andestablishing a two-way communication channel, within the trunked land mobile radio communication system, between said first and said second repeaters to thereby establish duplex voice communication between the radios for said first and second users.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×