JPS62160899A - Trunk selection system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a trunk selection method for an exchange, and more particularly to a trunk selection method suitable for increasing line usage efficiency in a communication network having a plurality of voice qualities.

[Background of the invention j The potty trunk selection method for conventional switchboards is described in 140 of ``Fundamentals of Electronic Switching Systems,'' published October 5, 1970, edited by Hide Shikiba, and published by the Sleepy Communication Association (published by Ohmsha Shoten). As described on pages 146 to 146, divide the trunks into groups for each partner station to be connected, and if all the trunk groups selected first according to the numbering plan are in use, press the button to select another trunk group, If there is an unused trunk among these, a detour route using that trunk is used to connect to the target partner station.

In recent years, various audio compression methods have been realized, and time division multiplexing devices have been developed that can select one of a plurality of audio qualities depending on the purpose in one-to-one conversion. If a conventional trunk selection method is applied to a communication network using such a time division multiplexing device and trunks are grouped according to voice quality, line usage efficiency will decrease. Therefore, it becomes necessary to develop a new trunk selection method.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a trunk selection method that reduces line usage efficiency in a communication network that uses various audio compression methods and has a plurality of audio qualities.

[Summary of the Invention J In order to achieve the above object, the present invention provides a communication network configured with a switching device and a time division multiplexing device in which audio compression methods having a plurality of audio qualities can be selected depending on the application. To select a trunk that achieves a higher call quality when a trunk that achieves a higher call quality is already in use.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram illustrating a trunk selection method according to an embodiment of the present invention. In the figure, telephones 1 and 7
An axis device 2 is housed in a private branch exchange 3. This private branch telephone exchange has 3 calculation processing bags ft4 and memory 5
and a trunk 6.

The time division multiplexing system FI18 in this embodiment has three types of trunks 7 with built-in voice compression functions, and each trunk 7 with built-in voice compression functions is connected to the trunk 6 of the private branch telephone exchange PR3. In the illustrated embodiment, audio compression 8! The bit rate of each audio compression method for the built-in trunk 7 is set to 64 kbps.
, 32 kbps, and 16 kbps, and the trunks 6 are grouped into three types corresponding to these three types of download rates. Here, it is assumed that the higher the bit rate, the better the call voice quality.

When there is a call from telephone 1, it is called 1 within the premises! Story 3i! Switching machine 3
refers to the root index in the memory 5 in the arithmetic processing unit 4 according to the call quality of the telephone 1),
One of the three groups of trunks 6 is selected, and an empty trunk 6 is captured. When the speech quality is a bit rate of 16 kbps, the trunk 6 connected to the trunk 7 with a built-in 16 kbps audio pressure ays function is captured.

If there is no free trunk, the route index is further referred to, and a free trunk 6 in the trunk group connected to the trunk 7 with built-in voice compression function of 32 kbps is selected by referring to the route index. Capture. If there is no vacant trunk at this time, the vacant trunk 6 in the trunk group connected to the 64 kbpg audio compression function trunk 7 I/c is similarly acquired. These series of processes are continued until the trunk of the trunk group that achieves the best call quality is accessed.

7 Axim + 7 devices 2 with call quality of 52 kbps
If a call is made from 52, as above,
When an empty trunk 6 in a trunk group connected to a trunk 7 with built-in kbps audio pressure capability is captured, and this empty trunk is selected, an audio pressure m of 64 kbps is detected.
A blocked trunk 6 in a trunk group connected to a trunk 7 with a built-in function is captured.

[Effects of the Invention j According to the present invention, idle lines can be used efficiently, and line usage efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram illustrating a trunk selection method according to an embodiment of the present invention. 1...Telephone, 2...Fax machine, 3...
private branch telephone exchange, 4... arithmetic processing unit, 5... memory, 6... trunk, 7 trunk with built-in voice pressure m function, 8... time division multiplexing device.

Claims (1)

[Claims] 1. In a communication network configured with a switching system and a time division multiplexing device that allows voice compression methods with multiple voice qualities to be selected depending on the application, when a trunk that achieves the selected call quality is already in use. A trunk selection method that uses trunks that achieve even higher call quality.