Browse Prior Art Database

HANDSET TO HANDSET CALL WITHOUT GOING THROUGH PUBLIC SWITCHED TELEPHONE NETWORK

IP.com Disclosure Number: IPCOM000007566D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-05
Document File: 2 page(s) / 96K

Publishing Venue

Motorola

Related People

Ng See Woon: AUTHOR [+2]

Abstract

This invention is built on the Patent Disclosure, "Two-Way Calling in Public CT2 System Using Call Forwarding" by Ronald E. Sharp and Prash Gowda dated 4 April 1994.

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MOTOROLA Technical Developments

HANDSET TO HANDSET CALL WITHOUT GOING TVROUGH PUBLIC SWITCHED TELEPHONE NElWORK

by Ng See Woon and Prash Gowda

BACKGROUND AND STATEMENT OF PROBLEM

  This invention is built on the Patent Disclosure, "Two-Way Calling in Public CT2 System Using Call Forwarding" by Ronald E. Sharp and Prash Gowda dated 4 April 1994.

  The system which they proposed eliminates the need for a Mobility Management Unit. When a hand- set moves into the coverage area of a new Base Station, the registration ofthe handset with the Base results in the invoking of a call forwarding facility offered by the PSTN. This causes all calls destined to the handset (handset unique directory number) to be transferred to the Base Station's hunt group number.

  The PID associated with the handset can be obtained in two ways which they also proposed. The first method requires that the forwarded call include an ISDN Called-subaddress IE which carries the PID of the called handset so that the Base Station can poll the handset. If the PSTN does not support the Called-subaddress IE in a forwarded call, their sec- ond method calls for a PID and handset directory number entry to be maintained in the Base Station's PID-DN list during the registration process. When the forwarded call arrives at the Base Station, the Original Dialed Number (actually the handset direc- tory number) is used to look up the PID-DN list to obtain the associated PID for polling.

  This invention addresses an inconvenience tied to the second method 'described above. In their scheme, when the handset calls another CT2 hand- set registered and located within the same Base Sta- tion's cove...