KR0152137B1 - Telephone terminal device having priority of response in branch access and control method of the device - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION The invention described in the claims relates to an apparatus and a control method for determining a priority order when a branch connection is made by at least two automatic answering telephone terminals on a single telephone line.

2. Technical problem to be solved by the present invention: Provides an apparatus and method for sequentially answering an incoming call with a priority order when at least two telephone terminals set in an auto answer mode are connected to one telephone line. .

3. Summary of Solution of the Invention: Ring detecting means for detecting ring signal from telephone line, line occupancy detecting means for detecting the level of line voltage of said telephone line and outputting line occupancy detection signal, and said ring detection. Responding to the output of the means, the control unit responds to an incoming signal when the line occupancy detection signal is not output until the preset priority check time is down and the count is completed. Otherwise, it will automatically answer after a preset time.

4. Important use of the invention: telephone terminal device, matching circuit of telephone terminal device.

Description

Telephone terminal device having priority response in branch connection and its control method

1 is an exemplary diagram in which at least one telephone terminal is connected to one telephone line.

2 is a timing diagram illustrating the principle of a priority response ranking method according to an embodiment of the present invention.

3 is a block diagram of a portion of a telephone terminal device having a priority response in branch connection according to an embodiment of the present invention, which is a circuit diagram of a telephone line matching unit for determining the priority response priority.

4 is a flowchart for determining priority response in a telephone terminal according to an embodiment of the present invention.

The present invention relates to a telephone terminal device and a control method for determining at least two automatic answering telephone terminals in a single telephone line to determine a priority response in a branch connection.

In general, a telephone terminal is widely used as a device for transmitting and receiving voice, image, or data to a remote counterpart using a telephone line. At present, in most offices or homes, it is common to use one or more telephone terminals connected to one telephone line for efficient use of the telephone line.

That is, as shown in FIG. 1, one or more telephone terminals 12, 14, and 16 are connected in parallel to one telephone line 18 and used in the form of a branch. Such terminals include various types of terminals, such as general voice telephones, answering machines, fax machines, and the like. As described above, the advantage of using various types of telephone terminals connected to one telephone line may be various advantages such as easy conversion so that image data can be exchanged during the voice call.

However, the disadvantage of using a plurality of telephone terminals connected to one telephone line as described above is a problem that a user does not receive an incoming call by responding to an incoming call at the same time when the telephone terminals are set in the auto answer mode.

For example, if the first telephone terminal 12 shown in FIG. 1 is a facsimile machine set to the auto answer mode and the second telephone terminal 14 is an answering machine set to the auto answer mode, each of the two telephone terminals is called. A problem arises in that a desired call cannot be made by automatically responding to each of the ring signals received on line 18) and automatically transmitting a predetermined message. Herein, the preset message may be a protocol message in the case of a facsimile, or an out-of-office guidance message in the case of an answering machine.

Accordingly, it is an object of the present invention to provide a telephone terminal device having a priority order of answering an incoming call sequentially and having a response priority when two or more telephone terminals are connected to a single telephone line, and a control method thereof. have.

Another object of the present invention is to provide a telephone terminal device and a method for receiving a call in response to an incoming call sequentially with a response priority when a telephone terminal having two or more auto answer modes is connected to a single telephone line. .

It is still another object of the present invention to provide a telephone terminal device and an incoming call response control method for detecting a line voltage of a telephone line and answering an incoming call when a plurality of telephone terminals are branched to a single telephone line.

The object of the present invention to achieve the above object is to count the input of the effective ring signal in response to the incoming of the ring signal to the telephone line, and the predetermined priority check time in response to the input of the predetermined ring signal (Priority check) time (hereinafter referred to as PCT) is automatically received after a delay. In this case, PCTs set in the plurality of telephone terminals connected to the telephone line are set differently from each other.

That is, the present invention for achieving the above object is a ring detecting means for detecting a ring signal from the telephone line, line occupancy detecting means for detecting the level of the line voltage of the telephone line and outputting a line occupancy detection signal; Achievement by providing an apparatus comprising control means for down counting a predetermined priority check time in response to an output of the ring detecting means and automatically responding to an incoming signal when the line occupancy detection signal is not output until the count is completed. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a timing diagram illustrating the principle of a priority response ranking method according to an embodiment of the present invention. In Fig. 2, reference numeral RS is a ring signal that is received on a telephone line, which has a period of 1 second continuous and 2 second interrupted, and the frequency of 1 second continuous is 20 Hz. VS is a valid signal of the ring detection signal. AA is for explaining the time point at which the valid signal automatically responds in response to reception for a preset number of times (here, assumed to be two ring incoming calls). In FIG. 2, the PCT in the auto answer signal AA is set to about 1 second from the falling edge of the valid signal when the incoming ring signal RS is detected twice.

3 is a block diagram of a portion of a telephone terminal according to the present invention, which is a circuit diagram of a telephone line matching section for determining priority order of response. This configuration includes a rectifier 20 connected to the telephone line 18 for polarity alignment of the trunk line voltage, a ring detector 21 for detecting a ring signal from the telephone line 18, and a line occupation detection signal for detecting the level of the line voltage of the telephone line. A line occupancy detector 22 that outputs an LSD, and is connected between the rectifier 20 and a network (not shown) and connects the rectifier 20 and the network to form a communication path in response to a communication path formation control signal; The control unit 24 and down count a preset priority check time PCT in response to the output of the ring detector 21 and the control signal in a call that automatically responds to an incoming call when the count is not exceeded and the line occupation detection signal LSD is not output. And a central processing unit 26 (hereinafter referred to as CPU) 26 which is supplied to the communication path control unit 24.

The matching circuit of the telephone terminal configured as shown in FIG. 3 is added inside the first, second and third telephone terminals 12, 14 and 16 shown in FIG. 1, respectively. The PCTs set in CPU 26 are set differently. For example, it should be noted that the PCT of telephone terminal 12 is 1 second, the PCT of telephone terminal 14 is 2 seconds, and the PCT of telephone terminal 16 is 3 seconds. At this time, the PCT set in each of the telephone terminals 12, 14 and 16 can be adjusted.

4 is a flowchart of priority response determination control in the telephone terminal according to the present invention.

Hereinafter, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

Now, when one or more telephone terminals 12, 14 and 16 are operated in a branch connection to one telephone line 18 as shown in FIG. 1, each of the CPUs 26 located in each of the telephone terminals 12, 14 and 16 is connected to FIG. In step 28, the output of the ring detector 21 is scanned to determine whether valid ring detection is performed. If it is determined that the search is not a valid ring detection, the CPU 26 repeats the process from step 28 of FIG.

When the ring signal RS as shown in FIG. 2 arrives on the telephone line 18 in the above operation state, the ring detector 21 of FIG. 3 detects the ring signal RS and supplies it to the CPU 26. At this time, the CPU 26 scans the output of the ring detector 21 at a predetermined period and counts it as a valid signal as VS of FIG. 2 when a ring detection signal is input. When the CPU 26 determines that the counting value of the valid signal VS of the ring detection signal is a preset value (for example, input of two ring signals), the CPU 26 determines that valid ring detection is performed in step 28 of FIG. 4.

In operation 30 of FIG. 4, the CPU 26 of FIG. 3, which determines that valid ring detection has been performed, reads the state of the line occupation detection signal LSD output from the line occupation detector 22 in step 30 to search for a current line occupation. In other words, it is to search whether another telephone terminal having a higher priority than its own answering priority has already answered. At this time, the line occupation state is detected by the operation of the line occupation detector 22.

The line occupation detector 22 detects the level of the trunk line voltage (usually -48 volt DC voltage) supplied from the trunk line switch to the telephone line 18 to determine the occupancy state. For example, if a plurality of telephone terminals 12, 14, and 16 connected in parallel to telephone line 18 are in an on-hook state as shown in FIG. Volts), and when the telephone terminals of the telephone terminals 12, 14 and 16 are off-hook for answering or calling operation, the trunk line voltage level is determined by the terminal impedance of the off-hook telephone terminal. Will fall by almost half.

That is, the voltage drops to a voltage level of 22 to 24 volts. The line occupancy detector 22 detects the voltage of the telephone line changed by the above cause and outputs a line occupation detection signal LSD indicating whether the telephone line has already been occupied by a third party as a logic level signal. If it is determined in step 30 of FIG. 4 that the state of the output signal of the line occupancy detector 22 is in the line occupancy state, the CPU 26 indicates that a third telephone terminal having an incoming priority higher than its own priority has already answered the incoming call. Judgment is terminated by the incoming call operation.

If it is determined in step 30 that the state of the output signal of the line occupancy detector 22 is not a line occupancy state, the CPU 26 counts a preset PCT as an internal counter in step 32 and searches whether the predetermined PCT has elapsed. . If the predetermined PCT has not elapsed as a result of the search, the CPU 26 repeats operation from the above-described process 30.

If the preset PCT has elapsed during the process of repeating steps 30 and 32 of FIG. 4, the CPU 26 determines that the CPUT responds to the call order and outputs a call control signal to the call controller 24 in step 34. At this time, the call path controller 24 automatically receives a connection between the rectifier 20 and a network (not shown) in response to the input of the call path control signal. That is, the telephone line 18 is off-hook to form a trunk line DC current loop.

At this time, when the automatic reception (forming of the current loop) is performed by the above operation, the trunk line voltage level on the telephone line 18 drops to a level of about ½, thereby lowering the priority of the telephone terminal having a lower priority than the telephone terminal which has been subjected to the automatic reception control. They terminate the incoming call control process. This is because the line occupation detector 22 in the low priority telephone terminal outputs the line occupation detection signal LSD as a valid signal.

In the branch connection configuration as shown in FIG. 1, priority 0 is automatically received as soon as a ring is detected, priority 1 has a PCT of about 1 second after detecting a valid ring detection, and priority 2 is about 2 after detecting a valid ring. If it has a second PCT, it can be seen that by the configuration and control procedures of the present invention can automatically answer in sequence.

As described above, according to the present invention, when at least one telephone terminal is branch-connected to a single telephone line, priority is set for an incoming response to each telephone terminal, and simultaneous operation of the terminal is made by automatically answering the incoming call according to the priority. By preventing the signal collision can be prevented in advance.

Claims (5)

A telephone terminal apparatus having a priority order of at least one telephone terminal connected to one telephone line during a branch connection, comprising: a ring detector for detecting a ring signal received on the telephone line, and a level of line voltage of the telephone line; A line occupancy detector that detects and outputs a line occupancy detection signal, and down counts a predetermined priority check time in response to detecting a ring signal from the ring detector, and outputs the line occupancy detection signal until the count is completed. And a controller for automatically answering incoming ring signals when not in use. The telephone terminal apparatus according to claim 1, wherein the line occupation detector detects a change in the level of the trunk line voltage of the telephone line and outputs a line occupation detection signal. A rectifier connected to a telephone line to align polarity of the trunk line voltage, a ring detector for detecting a ring signal from the telephone line, and a connection between the rectifier and the network, the rectifier and the network being connected in response to a call path forming control signal. A telephone terminal device having a priority order in a branch connection having a call path control unit for connecting and forming a call path, comprising: a line occupation detector for detecting a line voltage level of the phone line and outputting a line occupation detection signal; A priority check time searcher for down counting a predetermined priority check time in response to ring signal detection by the ring detector, and an automatic response to an incoming signal when the count of the priority check time search device is not over and the line occupancy detection signal is not output. Consists of a controller for supplying a control signal to the call path control unit Branch telephone terminal apparatus having the first priority in response time of connection, characterized by. The telephone terminal apparatus according to claim 3, wherein the line occupation detector detects a change in the trunk line voltage level of the telephone line and outputs a line occupation detection signal. A method of determining a priority response level when a plurality of telephone terminal devices having different priority check times are branched to one telephone line, the method comprising: occupying the telephone line in response to the detection of a ring signal received on the telephone line. The line state search process for searching for a state and the line state search process are repeated until a predetermined priority check time elapses when the telephone line is determined to be idle in the line state search process. And a response process of automatically receiving in response to a ring incoming of the telephone line when the elapsed time elapses.