JPH0417495B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a message waiting signal sending system in a storage program controlled private branch exchange.

First, the conventional system will be explained with reference to the circuit diagram of the main parts of an example of the conventional message waiting signal sending system shown in FIG.

The telephone TEL is accommodated in the communication network NW (not shown) through the extension circuit LC.
Under control from the exchange control device CONT (not shown), the ringing signal sending relay R is operated at a predetermined intermittent ratio, and its contacts r1 and r2 switch the call line to the ringing signal sending circuit RNG, and the ringing Other connection control operations necessary for a call, such as sending a calling signal from the signal word CR to the telephone TEL, are performed.

When a telephone TEL subscriber (for example, a guest in a hotel room) is absent, when displaying that there is a message for that person (hereinafter referred to as message waiting display),
Message keyboxes installed near in-flight switchboard relay stations and other locations where service personnel are stationed (e.g., hotel reception)
Keys compatible with each extension (telephone TEL) of KEYBOX
When you operate the relevant one (for example, K1) among K1 to Kn, the +90V power supply disconnected by its intermittent contact int is sent from the message waiting signal sending circuit MWS as a message waiting signal to the key K1 - Line relay Secondary winding of L - Calling signal sending relay contact t2 - Message waiting indicator MWL - Calling signal sending relay contact r1 -
Primary winding of line relay L - Exchange power supply -
48V is applied through the path, and the neon lamp NL of the message waiting display MWL corresponding to the extension in question flashes.

The subscriber who was absent came home and turned on the neon lamp.
When the NL blinks, I know that there is a message, so I dial the specified number from the phone's TEL, and
The content of the message can be learned by talking to the operator at the relay stand or front staff.

This conventional method provides a key for displaying message waiting for all extensions.
Also, since you have to operate the relevant key,
In particular, as the number of extensions in a private branch exchange increases, the size of the message key box (KEY BOX) becomes large, requiring a large installation area, and it becomes complicated and time-consuming to operate the desired key. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a message waiting signal sending system that is economical, requires a small installation area, and has good operability.

A feature of the present invention is that in a message waiting signal sending system for a storage program controlled private branch exchange that can send out a calling signal from an extension circuit, message waiting display request information is identified and called according to the program operation of the exchange control device. The message waiting signal sending relay of the message waiting signal sending control circuit provided between the signal sending circuit and the extension circuit is operated in a predetermined intermittent manner during a period in which signal sending is to be interrupted during normal calling signal sending. By intermittently switching the calling signal sending lead and synchronously operating the calling signal sending relay of the extension circuit within the operation period, a predetermined message is sent from the message waiting signal sending control circuit through the extension circuit. A message waiting signal transmission method is used to send a message waiting signal to the extension concerned.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a circuit diagram of the main part of an embodiment of the message waiting signal sending system according to the present invention, FIG. 3 is a time chart thereof, and FIG. 4 is a flowchart thereof.

Here, MWL is the message waiting indicator, NL is the neon lamp, TEL is the telephone related to the extension, LC is the extension circuit, L and l are the line relay and its contacts, R and r1, r2 is the same calling signal sending relay and its contacts, MWC is the message waiting signal sending control circuit, MW and mw are the message waiting signal sending relay and its contacts, +150V is the DC related to the message waiting signal. The power supply, RNG, is a calling signal sending circuit, and CR is its calling signal source.

First, normal calls related to the telephone TEL, calls through the communication path network NW (not shown), etc. are performed under the control of the exchange control device CONT (not shown) in the same manner as described for the conventional system in Fig. 1. .

Next, when it is desired to display a message weighting display on the message weighting display MWL attached to the telephone TEL, a message weighting display request is made from a relay stand or the like (block 1 in the flowchart of FIG. 4).

This request information can be obtained, for example, by operating a common message waiting display key and dialing the extension signal of the telephone TEL, or by adding a specific number for requesting the same display and dialing the extension number. It is then sent out.

This is done by the exchange control device using a known method.
CONT is received, and the extension number is identified by the program operation (block 2).
It is identified that the message is related to message waiting display (block 3).

As a result, the exchange control device CONT determines whether message waiting display should be performed or not (block 4), and issues an intermittent operation command to the message waiting signal sending relay MW of the message waiting signal sending control circuit MWC. (block 5 of the same example), and checks whether or not the interruption has started (block 6 of the same example).

When this is confirmed, the calling signal sending relay R of the extension circuit LC is made to perform an intermittent operation in synchronization with the intermittent operation of the relay MW (block 7).

These intermittent operations are performed as shown in FIG. That is, when the intermittent operation of the calling signal sending relay R during normal calling signal sending is as shown in Figure a (for example, connected for 1 second and disconnected for 3 seconds),
As shown in Figure b, the period (3
Intermittent operation so that the relay MW operates (connects) within 1 second (according to the above example, the connection is 1 second and the disconnection is 1 second).
(seconds), and the relay R is operated within the operation period for each operation, as shown in c of the same figure.

This prevents the relay MW from operating during the calling signal sending period and disconnecting the calling signal sending lead by its contact mw when normal calling signals are being sent in other extension circuits. This is also to prevent a calling signal from being sent out by mistake while a message waiting signal is being sent out.

When the relays MW and R perform intermittent operation as described above, these contacts mw and r1, r2
, a DC power supply of +150V is applied as a message weighting signal to the message weighting display MWL, and its neon lamp
NL flashes.

This allows the subscriber of the telephone TEL to know that there is a message when he returns home, dial the telephone TEL off-hook, and, for example, call a relay stand and listen to the contents of the message.

At this time, line relay L of the extension circuit LC concerned
is activated, the exchange control device CONT detects and identifies the message content interval by closing its contact 1 (block 8), immediately stops the intermittent operation of the relays MW and R, and switches the message way. The transmission of the switching signal is stopped (block 9 of the same example). Note that the message waiting display request information is also canceled and the process returns to normal.

As described above in detail, according to the present invention, there is no need to provide a key for each extension, so that significant effects can be achieved in making the private branch exchange more economical, reducing the installation area, and improving operability.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of the main parts in an example of a conventional message waiting signal transmission system,
The figure is a circuit diagram of the main parts in an embodiment of the message waiting signal sending system according to the present invention.
FIG. 3 is a time chart thereof, and FIG. 4 is a flow chart thereof. MWL...Message weighting display,
NL...Neon lamp, TEL...telephone, LC...
...Extension circuit, L and l...Line relay and its contacts, R and r1, r2...Call signal sending relay and its contacts, MWC...Message waiting signal sending control circuit, MW and mw
...Message waiting signal sending relay and its contacts, +150V ...DC power supply, RNG...
...Call signal sending circuit, CR...Call signal source.

Claims (1)

[Claims] 1. In a message waiting signal sending method for a storage program controlled private branch exchange that can send a paging signal from an extension circuit, the message waiting display request information is identified according to the program operation of the exchange control device, and the message waiting display request information is identified between the paging signal sending circuit and the extension. The message waiting signal sending relay of the message waiting signal sending control circuit provided between the circuit and the message waiting signal sending control circuit is caused to perform a predetermined intermittent operation during a period in which signal sending is to be cut off when sending a normal calling signal, thereby generating a calling signal. By intermittently switching the sending lead and synchronously operating the calling signal sending relay of the extension circuit within the operation period, a predetermined message waiting signal is sent from the message waiting signal sending control circuit through the extension circuit. A message waiting signal transmission method characterized in that a message is sent to the extension to ensure that it is received.