JP2794582B2 - Subscriber telephone audit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a crossbar-type automatic telephone exchange which is connected to a subscriber line, and for an outgoing call generated on the line, a hook-up time, a dial number, a response The time and the end time are recorded, and for an incoming call, the incoming time, answer time,
In addition, the present invention relates to a subscriber telephone auditing apparatus that records a call termination time and thereby performs a call traffic audit.

[Prior Art] In a conventional subscriber telephone auditing apparatus, the following countermeasures have been taken when auditing a PB (push button) dial type subscriber telephone (PB subscriber telephone).

That is, if the telephone subscriber using the PB subscriber telephone has long pressed the dial button corresponding to the last dialed number, when the telephone line is switched from the calling register of the telephone exchange to the trunk, the telephone line is connected. A momentary interruption occurs, and the current supply to the subscriber telephone is temporarily cut off.

Accordingly, at this time, there is no power supply for driving the DTMF signal transmission circuit of the subscriber telephone, and the transmission of the DTMF signal transmission circuit is temporarily stopped, and after the instantaneous interruption of the communication line is restored, the transmission is started again.

Therefore, the dial number corresponding to the push button for the last dial is transmitted twice. For example, it may be detected that the telephone subscriber has pressed the dial "77" even though the telephone subscriber last pressed the dial "7".

In order to deal with this, the conventional subscriber telephone inspection device measures the interval between the detected DTMF signal (PB dial signal) and the next detected DTMF signal. Were determined to be the same DFMF signal.

[Problems to be solved by the invention]

In the above prior art, the interval of the DTMF signal is constantly measured to determine whether the signal is the same DTMF signal. Therefore, when the telephone subscriber quickly presses the dial button, the DTMF signal is transmitted at time t.
As shown below, there was a problem that dial reception was not possible. That is, there is a problem that the dial receiving limit is deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent malfunctions only when the crossbar type automatic telephone exchange normally changes the telephone line from the transmission register to the trunk without affecting the limit of the dial reception operation.

[Means for solving the problem]

The present invention monitors a communication line from an automatic telephone exchange and a control line corresponding to the communication line, and audits communication traffic of an outgoing / incoming call generated on the communication line between a subscriber telephone and the automatic telephone exchange. Detecting means for detecting an instantaneous interruption of the control line;
Receiving means for receiving a dial signal; and, when the detecting means detects an instantaneous interruption of the control line, the receiving means comprises a first PB for a predetermined time from when the instantaneous interruption of the control line is restored.
When a dial signal is received, the first PB dial signal and the second PB dial signal received immediately before the first PB dial signal, the second PB dial signal being received immediately before the instantaneous interruption of the control line Comparing means for comparing the signal with the first signal;
As a result of comparing the PB dial signal and the second PB dial signal, when they match, it is determined that the first PB dial signal is an invalid dial and the second PB dial signal is a valid dial, If they do not match, the first PB
Determining means for determining that both the dial signal and the second PB dial signal are valid dials.

[Action]

By adopting such a configuration, even if the telephone subscriber operates the dial button quickly, it does not affect the limit of the PB dial receiving operation, accurately receives the PB dial signal, and uses the crossbar method. The automatic telephone exchange performs an exchange operation of switching the communication line from the transmission register to the trunk, so that even when the current supply to the communication line is momentarily interrupted, erroneous operation of receiving the PB dial signal can be prevented.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and FIG.

FIG. 1 is a diagram showing the configuration of a subscriber telephone auditing apparatus connected to a crossbar type automatic telephone exchange according to an embodiment of the present invention.

In FIG. 1, 1 is a crossbar automatic telephone exchange, 2
Is a PB subscriber telephone, 3 is a communication line of the PB subscriber telephone 2, 4 is a control line corresponding to the communication line 3, 5 is a frequency meter, and 6 is a subscriber audit device.

Reference numerals 7 to 11 denote the internal structure of the subscriber telephone auditing device 6, 7 denotes a DTMF signal receiver, 8 denotes a control line monitoring unit, 9 denotes a control unit, 10 denotes a storage unit, and 11 denotes a printer. .

 Next, the operation of the subscriber telephone inspection device will be described.

When the PB subscriber telephone 2 raises the receiver, the control unit 9 of the subscriber telephone auditing device 6 detects that the call is an outgoing call by another means not shown in FIG. After confirming the earth condition of the communication line 3 through the DTMF signal receiver 7,
Monitor the DTMF signal.

When receiving the DTMF signal, the control unit 9 stores the DTMF signal in the storage unit 10 for each call.

If the operator wants to know the call traffic information,
The print output activation request is transmitted to the control unit 9 by another means not shown in the drawing, while the control unit 9
The data is read from 10 and printed out to the printer 11.

FIG. 2 shows the operation of the above-mentioned subscriber telephone audit device.
FIG. 6 is a diagram showing a signal time chart when receiving a PB dial.

In FIG. 2, (a) shows a DTMF signal generated on the communication line 3, (2) shows an output signal from the DTMF signal receiver 7, and (b) shows a ground signal on the control line 3.

FIG. 2 shows a state in which the dial button of the PB subscriber telephone set 2 is pressed as "177" and the last dial button "7" is pressed for a long time.

Thus, when the last dial button "7" is pressed for a long time, the transmission register of the automatic telephone exchange apparatus 1 activates the marker to connect the communication line 3 to the trunk corresponding to the dial "177".

At this time, the connection change causes an instantaneous interruption of the communication line 3 and also an instantaneous interruption of the control line 4. Then, due to the momentary interruption of the communication line 3, the last PB dial “7” is
It appears on the output of the DTMF signal receiver 7 as a dial “77”. That is, the PB dial “7” is output when the call line 3 is momentarily interrupted, and the PB dial “7” is output again after the momentary interruption of the call line 3 is recovered.

At this time, the control unit 9 detects an instantaneous interruption of the control line 4 via the control line monitoring unit 8, and receives the first PB dial signal received during a predetermined time (timer T) after the restoration of the instantaneous interruption. , The first
Is compared with the second PB dial signal received immediately before the instantaneous interruption of the control line 4.

If they match, the first PB dial signal is determined to be an invalid dial, and the second PB dial signal is determined to be a valid dial.
Both the PB dial signal and the second PB dial signal are determined to be valid dials.

〔The invention's effect〕

According to the present invention, except when the crossbar-type automatic telephone exchange switches the communication line from the transmission register to the trunk, it does not affect the characteristics of DTMF signal reception at all, and switches the communication line from the transmission register to the trunk. Only if
Malfunction of DTMF signal reception can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a subscriber telephone inspection apparatus according to the present invention, a subscriber telephone, and a crossbar automatic telephone exchange apparatus;
FIG. 2 is a diagram showing a time chart when the subscriber's telephone audit device receives a dial. DESCRIPTION OF SYMBOLS 1 ... Crossbar-type automatic telephone exchange device, 2 ... PB-type subscriber telephone, 3 ... Communication line, 4 ... Control line, 5 ... Frequency meter, 6 ... Subscriber telephone auditing device, 7 ... DTMF Signal receiver, 8: control line monitoring unit, 9: control unit, 10: storage unit, 11: printer.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Yamazaki 94, Kojiyama-shi, Fukushima Prefecture, in the area of Hitachi Telecom Technology Co., Ltd. (72) Inventor Tetsuo Sano 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone (72) Inventor Masato Inaba 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Hiroyuki Yamada 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Hideo Shimazaki 24-4 Sakuragaoka-cho, Shibuya-ku, Tokyo Inside Nakayo Communication Equipment Co., Ltd. (56) References JP-A-51-17610 (JP, A) JP-A-58-59693 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 3/08-3/14 H04M 3/22-3/36 H04Q 1/20-1/26 H04Q 1/30-1/50

Claims (1)

(57) [Claims] A call line from an automatic telephone exchange and a control line corresponding to the call line are monitored, and call traffic of an outgoing / incoming call generated on the telephone line between a subscriber telephone and the automatic telephone exchange is monitored. In the subscriber telephone audit device to be audited, detecting means for detecting an instantaneous interruption of the control line, receiving means for receiving a PB dial signal from the communication line, and when the detecting means detects an instantaneous interruption of the control line When the receiving means receives the first PB dial signal for a predetermined time from when the momentary interruption of the control line is restored,
Comparing means for comparing the PB dial signal with the second PB dial signal received immediately before the first PB dial signal and immediately before the instantaneous interruption of the control line; As a result of comparing the first PB dial signal with the second PB dial signal, when they match, the first PB dial signal is compared with the first PB dial signal.
Is determined as an invalid dial, the second PB dial signal is determined as a valid dial, and if they do not match, both the first PB dial signal and the second PB dial signal are determined as a valid dial. A subscriber telephone audit device, comprising: a determination unit;