Apparatus for auto dialing telephone numbers and DTMF tones in a personal communication device

US5561705A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• David J. Allard · Boynton Beach, US
• Peter R. Eastwood · Jigalong, AU
• Julie Goodwin · Boca Raton, US
• James R. Lewis · Delray Beach, US
• David Rasmussen · Redmond, US

Key dates

• Filing date: Jul 25, 1994
• Grant date: Oct 1, 1996
• Expiry date: Jul 25, 2014

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W28/14
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A radio telephone which communicates via cellular telephone networks and by direct connection to a PSTN. The radio telephone includes a random access memory for storing a character string comprising dialing digits defining a calling number and DTMF digits representing signalling tones for accessing information to called equipment. The character string includes a delimiting character for separating dialed digits and DTMF digits. In a dialing sequence, the cellular radio will dial numbers defined by the dial digits and send the remaining characters as DTMF tones to connected telephone.