Voice monitoring method for a telephone switching equipment

• US 5,757,889 A
• Filed: 01/03/1996
• Issued: 05/26/1998
• Est. Priority Date: 01/11/1995
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ohtake, Kiyomi
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TIEU, BINH KIEN
• Application Number:
  US08/582,582
• Time in Patent Office: 874 Days
• Field of Search: 379/1, 379/9, 379/10, 379/15, 379/16, 379/17, 379/20, 379/22, 379/27, 379/29, 379/34, 379/101, 379/156, 379/158, 379/166, 379/201, 379/215, 379/207, 379/212, 379/213, 379/214, 379/98 , 379/95, 379/93, 379/106, 379/107, 379/211, 379/265, 379/266, 379/309, 379/208, 379/218
• US Class Current: 379/32.02
• CPC Class Codes: H04M 3/18 with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
• CPC Class Codes: H04M 3/2272 Subscriber line supervision circuits, e.g. call detection circuits

Abstract

A voice monitoring method which is capable of preventing an occurrence of the interruption of a call and reducing the burden of switching software, and also capable of monitoring the contents of a call whose communication path is performed within the same line switch installed in a remote place is provided. A voice from a monitored subscriber telephone set 6-1 is distributed at a line switch 4-1 to a voice monitor path (unidirectional path) 8-1, and a voice from a subscriber telephone set 6-2 of the other party is distributed at the line switch 4-1 to a voice monitor path (unidirectional path) 8-2. The distributed voices are given through a time-division switch 3 to the first and second terminals of a three-way trunk 5, are mixed at the three-way trunk 5, and are sent through the third terminal to a monitor telephone set 7.

Claims

1. A voice monitoring method for a telephone switching equipment including a time-division switch for establishing communication paths, a plurality of line switches being connected to the time-division switch for connecting and concentrating a plurality of subscriber telephone sets, and at least one three-way trunk being connected to the time-division switch for providing three-way communication paths, said method comprising steps of:

distributing a voice from a monitored subscriber telephone set and a voice to said monitored subscriber telephone set at said line switch;

giving both the distributed voices through said time-division switch to first and second terminals of said three-way trunk for mixing said distributed voices; and

giving said mixed voices from a third terminal of said three-way trunk to a monitoring telephone set through said time-division switch.

2. A voice monitoring method for a telephone switching equipment including a time-division switch for establishing communication paths, a plurality of line switches being connected to the time-division switch for connecting and concentrating a plurality of subscriber telephone sets, and at least one three-way trunk being connected to the time-division switch for providing three-way communication paths, said method comprising steps of:

connecting a first monitoring path having one directional signal transmission characteristics to a signal receiving terminal from a monitored telephone set at a first line switch;

connecting another end of said first monitoring path to a first signal receiving terminal of said three-way trunk through said time-division switch;

connecting a second monitoring path having one directional signal transmission characteristics to a signal sending terminal to a monitoring telephone set at a second line switch; and

connecting another end of said second monitoring path to a third signal sending terminal of said three-way trunk through said time-division switch.

3. A voice monitoring method for a telephone switching equipment according to claim 2, further comprising steps of:

connecting a third monitoring path having one directional signal transmission characteristics to a signal receiving terminal from a telephone set connected with said monitored telephone set at a first line switch;

connecting another end of said first monitoring path to a second signal receiving terminal of said three-way trunk through said time-division switch.

4. A voice monitoring method for a telephone switching equipment according to claim 3, wherein,

said first line switch is remotely located and connected to said time-division switch through transmission equipment.