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

• US 5,561,705 A
• Filed: 07/25/1994
• Issued: 10/01/1996
• Est. Priority Date: 07/25/1994
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Allard, David J., Eastwood, Peter R., Lewis, James R., Rasmussen, David J., Goodwin, Julie F.
• Primary Examiner(s): Bost, Dwayne D.
• Application Number:
  US08/279,652
• Time in Patent Office: 799 Days
• Field of Search: 379/58, 379/59, 379/354-356
• US Class Current: 455/564
• CPC Class Codes: H04M 1/2748 by matching character strings
• CPC Class Codes: H04M 1/27485 Appending a prefix to or inserting a pause into a dialling sequence
• CPC Class Codes: H04M 1/72403 with means for local support of applications that increase the functionality
• CPC Class Codes: H04M 1/738 Interface circuits for coupling substations to external telephone lines H04M1/78 takes precedence
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 76/10 Connection setup

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.

Claims

1. In a radio telephone system, an apparatus for transmitting a data string representing DTMF tones which may include a preceding series of dialing digits followed by a predefined delimiter comprising:

a radio telephone having a computer interface connected to receive commands from a data bus;

a random access memory for storing a character string;

a data processor connected by said bus and to said random access memory and to said radio telephone, said data processor being programmed to create logic means comprising;

phone busy means for detecting whether said radio telephone is engaged in a telephone call;

means, responsive to said phone busy means indicating an active call, for reading said character string and for sending commands over said data bus to cause said radio telephone to send DTMF tones corresponding to the entire character except for the delimiter character which is interpreted as a pause;

means, responsive to said phone busy means indicating no active call, for reading each character of said stored character string and for identifying each delimiter character in said character string, the first of said characters delimiting the end of dialing digits and the beginning of DTMF digits;

means for sending a command over said bus to said radio telephone to place a call to a party identified by said dialing digits;

, if any, and,

means for sending a subsequent command to said radio telephone to transmit each character following the first said delimiter character as DTMF tones except delimiter characters.

2. The radio telephone apparatus of claim 1, wherein the delimiter character is a comma and each comma following said dialing digits represents a time delay interval between each command to transmit a character as a DTMF tone.

3. The radio telephone apparatus of claim 1, further comprising the programming step of:

prior to reading each character, determining if said radio telephone is engaged in a telephone call; and

,

if said radio telephone is determined to be in a telephone call, sending a series of commands to said radio telephone to transmit all of said characters as DTMF digits separated by a time interval represented by each comma which is found between characters.

4. The radio telephone of claim 2, wherein the identifying means inserts each a null character in the string of characters in place of said first character to delimit the dialing digits from DTMF digits, and replaces said null character with a comma when said call has been placed.

5. The radio telephone of claim 4, wherein each comma including said replaced comma represents a time delay between each DTMF tone transmitted by said radio telephone.

6. A method of controlling a radio telephone to place a telephone call and transmit a series of DTMF digits contained in the same character string as dial digits comprising:

storing in a register a series of digits including a sequence of DTMF digits, which include dial digits separated from said DTMF digits by at least one comma;

detecting if said radio telephone is busy with an existing call;

reading each character in said register and identifying the first comma in said register as a delimiter to separate dialing digits and DTMF digits if said radio telephone is not busy and as a pause in a series of DTMF digits if said radio telephone is busy;

forming a dial command from said dialing digits, if any, and forwarding said command to a radio telephone for placing a call to a receiving device identified by said dialing digits; and

,

forming a DTMF command for each of said digits following said comma, and forwarding said DTMF commands to said radio telephone along with each of said following digits, whereby said radio telephone places said call and subsequently transmits said DTMF digits to said called receiving device.

7. The method according to claim 6 further comprising during the reading of each character following said first comma, delaying the transmission of said DTMF digits a delay period which is proportional to the number of said commas.

8. The method according to claim 6, further comprising the steps of:

before reading each character in said string, determining whether said radio telephone is engaged in a call; and

,

transmitting all of said characters as DTMF digits if said radio telephone is engaged in a call, and introducing a delay between transmission of digits for each comma detected between digits.