JPS61236293A - Private branch exchange - Google Patents

Abstract

PURPOSE:To make a direct call to an extension telephone set even from a rotary dialing telephone set by converting dial pulses of an additional dialing signal transmitted by an included telephone set into a push-button dialing signal and transmitting it. CONSTITUTION:When a central office trunk is acquired by the trunk line origination of a rotary dialing telephone set DPSTA and dialing operation is performed by the DPSTA, it is counted by an originating register ORT and a CPU controls a dial pulse sender DPSD, so that a dial pulse signal is sent out of the COT to an office. When the CPU detects the number of digits of the called subscriber number and the completion of dialing of all digits is confirmed by the originating extension, the DPSD is released and a push-button signal sender PBSD is acquired and connected to the COT. When a called extension number is dialed, the CPU connects the PBSD connected to the COT to convert the dial pulse signal generated by the dialing operation of a calling subscriber into a push-button signal, which is sent out to an incoming-side private branch exchange.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to selection signal sending means for a private branch exchange.

〔overview〕

The present invention converts the dial pulse of the additional dialing signal sent from the housed telephone into a pushbutton dialing signal when the other party's device connected via a central office line uses an additional dialing reception method using pushbutton dialing signals. This facilitates the operation of the additional dial reception method.

[Conventional technology]

When sending an extension number selection signal to a private branch exchange that has an additional dial dial-in function, the central office exchange cannot relay this selection signal to the receiving private branch exchange.
A push-button dial signal generated by the calling push-button dial telephone was used.

[Problems to be solved by the invention] ``In such a conventional system, a widely used rotary dial extension telephone directly calls the extension of the called party's private branch exchange equipment that has an additional dial system dial-in function. Since the connection is made through the operator, there is a drawback that the additional dialing system dial-in function of the private branch exchange on the called side cannot be used effectively.

The present invention eliminates such drawbacks and provides a rotary dial extension telephone with a function to directly call an extension telephone housed in a private branch exchange having an additional dial dial-in function without going through an operator. The purpose is to provide an exchange.

[Means for solving problems]

The present invention is a private branch exchange that accommodates a rotary dial telephone and is connected via a central office line to a counterpart device that receives additional dials using push-button dialing signals. The present invention is characterized by comprising means for converting at least a portion of an additional dial signal out of the dial pulses transmitted by the rotary dial telephone into a push button dial signal and transmitting the signal to a central office line.

[Effect]

If the destination to be called via a central office line is a private branch exchange that has a dial-in function using the additional dial reception method,
Regardless of whether the calling extension telephone is a rotary dial type or a push button dial type, the called number sent to the public office exchange is a dial pulse signal, and the extension number sent to the other party's private branch exchange is a dial pulse signal. A button signal transmitter is used to convert the dial pulse signal into a button signal and send it out. As a result, it is possible to directly call an extension housed in an additional dial type dial-in private branch exchange apparatus from a rotary dial type extension telephone housed in a private branch exchange apparatus having a pushbutton signal sending sender.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1, 2, and 3 are explanatory diagrams showing the relay operation of the apparatus according to the embodiment of the present invention.

In Figure 1, when the rotary dial telephone STA makes a call to the central office line, the central office trunk COT is captured, and when a dial operation is performed on the rotary dial telephone DPSTA, this is counted by the outgoing register ORT, and the central control (not shown) Device CP
The dial pulse sending sender DPSD is controlled by u, and a dial pulse signal is sent to the office from the office line trunk COT. At this time, the number of digits of the dial pulse signal sent to the station differs depending on the local and out-of-town areas, so the central control unit CPU analyzes this number of digits based on the local and out-of-town identification numbers and The number of digits in the number is detected. Based on this detection result, when it is confirmed that all digits have been dialed on the calling extension, the dial pulse sending sender DPSD, which has been connected to the central office trunk COT, is activated as shown in Figure 2. The released and newly free button signal sending sender PBSD is captured and connected to the central office trunk COT. Continuing, in the central office trunk COT, the response of the incoming premises equipment is the A line and the B line.
A potential reversal on the line is detected, following which a second dial tone is sent to the calling extension. As a result, when the caller who has been prompted to dial the extension number dials the called extension number, the central controller cp
The pushbutton signal sending sender PBSD connected to the central office line trunk COT is controlled by u, and the dial pulse signal dialed by the caller is converted into a pushbutton signal and sent to the called party's private branch exchange. Ru. Thereby, a calling signal can be directly sent to the called extension telephone without going through the operator.

Since the number of digits of the extension number of the called extension telephone is generally different, about 10 seconds after the central control unit CPU sends the button signal, the button signal sender P
The BSD and the originating register ORT are released, and a transition is made to the three-way call state shown in FIG.

〔Effect of the invention〕

As explained above, the present invention enables a direct call to an extension telephone housed in a private branch exchange device having an additional dial-in function, which was previously possible only from a push-button dial telephone, to a rotary dial telephone. It also has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1, FIG. 2, and FIG. 3 are explanatory diagrams of the relay operation of the embodiment device. DPSTA...rotary dial telephone, COT...
Office line trunk, S-... call switch, ORT...
Transmission register, DPSD... dial pulse sender,
PBSD...button signal sender.

Claims (1)

[Claims] (1) In a private branch exchange that accommodates a rotary dial telephone and is connected via a central office line to a counterpart device that receives additional dials using push-button dial signals, at least additional dial pulses transmitted by the rotary dial telephone are provided. A private branch exchange characterized by comprising means for converting a dial signal part into a push button dial signal and transmitting the signal to a central office line.