JPS6315556A - Controlling system for sending dial tone - Google Patents

Abstract

PURPOSE:To easily identify the trunk line call allowable class of an extension telephone set while listening to a dial signal only by providing >=2 kinds of dial tone sources to extension subscribers and a means for applying transmission control of a dial tone from each dial tone source. CONSTITUTION:An extension subscriber hooks off an extension telephone set 1, it is detected by a controller 5. The controller 5 identifies the trunk line allowable class of the extension l, applis the connection of a connection path 7 of a switch 6 when the trunk line call is allowed to connect the extension 1 and, 1st dial tone source 3, and applies the connection of a connection path 8 of the switch 6 to connect the extension 1 and a 2nd dial tone source 4. The extension subscriber of the extension 1 listens to different kinds of dial tone to recognize the propriety of the trunk line call of the said extension 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tone transmission control output formula related to regulation of central line transmission of a private branch exchange.

[Conventional technology]

Conventionally, in a private branch exchange, the dial tone sent to an extension telephone when the handset of the extension telephone is taken off-hook is
Regardless of the extension phone's class of whether or not it can make calls to a central office line,
Only one type of dial tone was being sent out.

[Problem that the invention seeks to solve]

The conventional private branch exchange's dial tone transmission control system only automatically transmits one type of dial tone to an extension telephone. Therefore,
When the extension subscriber took the extension telephone off-hook and heard the dial tone, it was not possible to determine whether or not the call could be made to the central office line. In particular, when the extension subscriber attempts to make a call to the central office line from another extension telephone that is not normally used, it is not possible to immediately determine whether or not the telephone number M1 can be used to make a call to the central office line. Only when an attempt is made to make a call to the central office line can it be determined whether or not the extension telephone can make a call to the central office line.As a result, the subscriber has to perform an extra operation. There was a problem.

[Means for solving problems]

The tone transmission control system for a private branch exchange according to the present invention includes two or more types of tone sources for extension subscribers and means for controlling the transmission of tone from the tone sources.

〔Example〕

Next, one embodiment of the present invention will be described using the drawings.

FIG. 1 is a relay power equation diagram of one embodiment of the present invention, and is a diagram illustrating a state in which a first calling tone source 3 is connected to an extension telephone 1. In FIG. In Figure 1, inside! When the IR telephone 1 is taken off-hook by an extension subscriber, this is detected by the control unit 5. The control device 5 identifies the class of whether the extension telephone 1 can make a call to the central line, and if it is possible to make a call to the central line, connects the connection bus 7 of the switch 6 to connect the extension telephone 1 and the first calling sound source 3. If it is not possible to make a call to the central office line, the subsequent path 8 of the switch 6 is connected, and the extension telephone 1 and the second call sound source 4 are connected. By listening to different types of dial tones, the extension subscriber of the extension telephone 1 can know whether or not the extension telephone 1 can make calls to the central office line. Thereafter, the operation of the extension telephone 1 is no different from normal operation. In addition, in this embodiment, only the possibility of making a call to station +i is discussed; it goes without saying that it is also possible for the woman to control the sending of multiple types of dial tones by controlling the dial number sent to the office line trunk 2. Nor.

〔Effect of the invention〕

As explained above, by implementing the present invention, it is possible to easily identify the class of whether or not an extension telephone can make calls to a central office line by simply hearing the dial tone when the handset of the extension telephone goes off-hook. This has the effect that the extension subscriber can omit the extra operation of transmitting the access code or dial code to confirm whether or not the telephone call can be made.

Claims (1)

[Claims] In a dial tone transmission control method for a private branch exchange device having a central line dialing restriction control means, a plurality of types of dial tone sources each corresponding to the central line dialing restriction class of an extension telephone, and this 1. A dial tone transmission control system comprising: means for connecting a dial tone source corresponding to a local line dialing regulation class of an extension telephone to the extension telephone.