Browse Prior Art Database

Data Exchange over Single Voice Channel for Enhanced Telephone Functions

IP.com Disclosure Number: IPCOM000116106D
Original Publication Date: 1995-Aug-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 223K

Publishing Venue

IBM

Related People

Mori, T: AUTHOR

Abstract

This article describes a set of intelligent telephones which can exchange digital information using audio signal such as Dual Tone Multi Frequence (DTMF) with a simple coding rule, so that messages may be displayed on the LCD panel of the telephone or a function may be selected by touching the LCD panel. The telephone has a button, called "Smart Button", to help the initial handshake with another telephones, which may or may not have implemented this invention. The handshake consists of the protocol to exchange digital information, emulating ring-back tone, and the use of the Smart Button.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 20% of the total text.

Data Exchange over Single Voice Channel for Enhanced Telephone Functions

      This article describes a set of intelligent telephones which
can exchange digital information using audio signal such as Dual Tone
Multi Frequence (DTMF) with a simple coding rule, so that messages
may be displayed on the LCD panel of the telephone or a function may
be selected by touching the LCD panel.  The telephone has a button,
called "Smart Button", to help the initial handshake with another
telephones, which may or may not have implemented this invention.
The handshake consists of the protocol to exchange digital
information,
emulating ring-back tone, and the use of the Smart Button.

      This invention enables enhanced functions to be provided by
telephones that are connected over a network where no data channel is
available separately from voice channel between the telephones.  By
implementing this invention, telephones can provide enhanced
functions without requiring a modem or any special hardware logic to
transmit data over the voice channel.

The characteristics of this invention are as follows:
  1.  A limited amount of data is exchanged between the telephones
       using audio signals, typically DTMF.  Even text of binary data
       may be sent using DTMF by defining a simple encoding rule.
  2.  The identification of calling telephone can be notified to the
       called telephone using the method defined by 1.
  3.  This invention defines a protocol for the data exchange and
       sequence of operations so that necessary data exchange, under
the
       method defined by 1., can be done quickly without surprising
the
       person using the telephone by the audio signals used for data
       exchange.  The protocol is described under "Description of
       Invention" below.
  4.  This invention defines a new button (called "Smart Button") on
       telephone.  The button is used as a part of the protocol
defined
       by 3.  The following figure shows a typical configuration of
       telephones of this invention (called "Smart Telephone").

A telephone, either calling or called, is in one of the following two
modes:
  1.  Manual
      A person is operating the telephone manually.
  2.  Auto
      The telephone is operating automatically under the control of a
       software program.  When a Smart Telephone is handling a call,
it
       knows which mode it is operating.  For example, when the Smart
       Telephone is calling another telephone, it is in Manual mode
if
       the handset is off-hooked physically and buttons are pressed
for
       dial.  When the Smart Telephone is answering a call, it is in
       Manual mode if the handset is off-hooked physically.  A Smart
       Telephone needs to know the following information or data at
the
       beginning of a call:
      o  Wheth...