Device and method for cleaning telephone number list

• US 5,796,816 A
• Filed: 02/21/1997
• Issued: 08/18/1998
• Est. Priority Date: 06/26/1995
• Status: Expired due to Term

• Current Assignee: Jintec Corp.
• Original Assignee: Jintec Corp.
• Inventors: Utsumi, Katsunori
• Primary Examiner(s): Hunter, Daniel S.
• Application Number:
  US08/793,248
• Time in Patent Office: 543 Days
• Field of Search: 370/264, 370/904, 379/355, 379/381, 379/382
• US Class Current: 379/381
• CPC Class Codes: H04M 1/27457 Management thereof, e.g. manual editing of data
• CPC Class Codes: H04M 3/42323 PBX's with CTI arrangements
• CPC Class Codes: H04M 3/5158 in combination with automated outdialling systems devices for signalling identity of wanted subscriber H04M1/26
• CPC Class Codes: H04Q 11/0457 Connection protocols
• CPC Class Codes: H04Q 2213/1307 Call setup
• CPC Class Codes: H04Q 2213/13092 Scanning of subscriber lines, monitoring
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/13166 Fault prevention
• CPC Class Codes: H04Q 2213/13173 Busy signals
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13206 User-to-user signaling, UUS
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13213 Counting, timing circuits
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 2213/13274 Call rejection, call barring
• CPC Class Codes: H04Q 2213/13288 Closed user groups, CUG
• CPC Class Codes: Y10S 370/904 Integrated Services Digital Network, ISDN

Abstract

A cleaning system retrieves a telephone number from a telephone number list to regard as a called party number and sends a SETUP message to the network, in which an unrestricted digital information is designated as a bearer capability. In case that an ALERTING or CONNECT message is sent back from the network, the system sends a DISCONNECT message to the network immediately to perform a clear sequence and determines the telephone number effective. In case that a DISCONNECT message is sent back from the network as a result that a call has not been accepted, the system also performs a clear sequence immediately and determines if the telephone number should be treated as an effective number or a null number according to the cause content sent from the network.

Claims

1. A cleaning system for a telephone number list including a computer such as a personal computer, comprising the following elements of:

being connected with an ISDN to process circuit-switched call control procedures defined in the ITU-T recommendation Q.931 as a calling terminal;

retrieving a telephone number sequentially from a telephone number list to be cleaned as a called party number to send a SETUP message including an unrestricted or a restricted digital information in a bearer capability information element to the network;

sending a DISCONNECT message to the network immediately to perform a clear sequence and determining the called party number in the SETUP message effective when the network receives the SETUP message sent and transfers an ALERTING or CONNECT message;

performing a clear sequence immediately and obtaining a cause in an information element of the DISCONNECT message from the network to determine the called party number in the SETUP message either effective or null according to the cause when the network does not receive the SETUP message sent and transfers a DISCONNECT message; and

generating a new telephone number list, which includes the telephone numbers determined effective and the telephone numbers determined null, separately.

2. A cleaning system of a telephone number list as set forth in claim 1, said system retrieving a new telephone number contained in a diagnosis information field attached to the cause, and generating a new telephone number list in which the telephone numbers in the SETUP message has been replaced with the retrieved number in case that the network sends back the cause containing "Number changed".

3. A cleaning system of a telephone number list as set forth in claim 1, said system deferring to determine if the telephone number is effective or null and including the telephone number in a deferred number list.

4. A cleaning system of a telephone number list as set forth in claim 1, said system designating said restricted digital information as a bearer capability in said SETUP message.

5. A method for cleaning a telephone number list wherein said telephone number is cleaned and updated according to the cleaning system as set forth in claim 1.