JP3141750B2 - Key telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone apparatus, and more particularly to a key telephone apparatus having a line transfer function.

[0002]

2. Description of the Related Art With the remarkable spread of portable telephones and car telephones in recent years, the use value of the transfer telephone function has been greatly improved. The operation of the conventional transfer telephone function will be described with reference to the sequence diagram of FIG. In the figure, when the calling party makes a call by inputting a telephone number into the telephone,
The calling terminal-side exchange (hereinafter, referred to as a first exchange) returns a ringing tone to the calling side and also receives a call at the key telephone apparatus, which is the call destination. When the key telephone device determines that the incoming telephone number is a line transfer number, the key telephone device automatically transmits a preset transfer number. This call arrives at the transfer destination terminal (telephone) via the automatic calling line exchange (hereinafter referred to as the second exchange). When a response is received from the transfer destination terminal, inversion information is transmitted from the second exchange to the key telephone apparatus. Upon receiving the reversal information, the key telephone apparatus connects the communication path between the calling telephone and the key telephone apparatus to the communication path between the key telephone apparatus and the transfer destination terminal. As a result, the caller can make a call (conference call) with the transfer destination telephone.

[0003] When the conference call ends and the calling side turns on the telephone, the loop between the calling terminal and the first exchange is released, and the first exchange sends a busy tone to the key telephone apparatus. . This busy tone is also received by the transfer destination terminal. Then, when the transfer destination terminal goes on-hook, the loop between the transfer destination terminal and the second exchange is released, and subsequently, the inversion information and the busy tone are transmitted from the second exchange to the key telephone apparatus. . This releases the loop between the key telephone unit and the second exchange, and then releases the loop between the key telephone unit and the first exchange.

In the key telephone apparatus which performs the above-mentioned line transfer function, the terminal at the transfer destination can talk with the extension terminal of the key telephone apparatus which is being passed during the telephone call between the office lines. May be needed. For example, when a telephone call between office lines is related to technology, something unclear appears in the call, and A who has detailed knowledge about this unclear place Is trying to listen to the extension terminal of the key telephone device that is passing through. In this case, conventionally, the transfer-destination terminal terminates the telephone line-to-line communication currently being acquired once, and newly transmits it to the extension terminal of the key telephone device that is being passed. It was made possible to talk with the extension terminal. Then, after confirming the contents, it was necessary to make a call again to the first party.

[0005] Further, when the transfer destination terminal attempts to talk with the extension terminal of the key telephone device that has passed through after the end of the telephone call between the office lines, the transfer destination terminal is now caught. It is necessary to end the current call and re-transmit the call to the extension terminal.

[0006]

In a conventional key telephone apparatus having a line transfer function, as described above, the transfer destination terminal performs a line transfer call or after the line transfer call is completed.
When it becomes necessary to make a call with the extension terminal of the key telephone device that is being passed, the call currently being captured is terminated once and the call is newly transmitted to the extension terminal. Therefore, there is a problem that the operation is troublesome and time-consuming, and the operability is poor. In addition, during the office line transfer call, temporarily talk to the extension terminal of the key telephone device that is
If the user wants to continue the conversation with the first call destination again after the talk with the extension terminal is over, end the office transfer call,
The telephone line is recaptured, the call is transmitted to the key telephone apparatus, a call is made with the extension terminal, and after this call is completed, the call must be made again from the transfer destination terminal to the first call destination. However, there is a problem that operability is poor.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems of the prior art, and to enable a transfer destination terminal to terminate a call transferred from an office line.
When it is necessary to make a call with an extension terminal of a key telephone device that is being routed, a key telephone that allows the user to talk with the extension terminal without terminating the currently acquired call once It is to provide a device.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method of terminating a call when the first party on the line receives an end call operation during a line transfer call. Means for detecting the state, means for detecting a control signal sent from the transfer destination terminal, and after detecting the control signal, send an incoming signal to the extension terminal, and by response operation of the extension terminal, Means for switching to a call with the extension terminal.

According to the present invention, after the central office transfer call, the transfer destination terminal can send a call to the extension terminal by transmitting the control signal. For this reason, one outgoing call can be effectively utilized, and convenience is great.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the transfer telephone apparatus of the present invention. The key telephone apparatus 1 having the transfer telephone function includes a plurality of local line IFs (interfaces) 2a, 2b, 2c,..., A changeover switch 3, and a plurality of extension line IFs (interfaces) 4a, 4b.
4c, 4d,..., A main CPU 5, a memory 6, a hold sound transmission circuit 7, a local line transfer circuit 8, and a message transmission circuit 9. Reference numeral 10 denotes an extension terminal (key telephone). In the memory 6, the telephone number of the transfer destination is registered in advance. The office line IF 2a is a transfer-designated line-side IF, and the office line IF 2b is a transfer-destination automatic transmission line-side office line IF for automatically capturing and transmitting an empty line.

The office line transfer circuit 8 is composed of data transmission / reception circuits 11 and 12, a DSP (digital signal processor) 13, a CPU 14, and a bus 15 for connecting these components, based on an instruction from the main CPU 5. The station lines connected to the data transmission / reception circuits 11 and 12 are connected to each other to provide communication between the station lines. The DSP 13 synthesizes voices of both office lines. The message sending circuit 9 includes a data transmitting / receiving circuit 21, a voice / data switching circuit 22, a CPU 23, and an ADPCM.
24 and a memory 25.
The ADPCM 24 converts a message or the like stored in advance into an analog signal, and transmits the analog signal through the voice / data switching circuit 22 to a designated line. In addition,
Since the configurations and operations of the station line transfer circuit 8 and the message sending circuit 9 are well known, detailed description will be omitted.

Next, the operation of the key telephone apparatus 1 according to the embodiment of the present invention will be described with reference to the flowchart of FIG. This operation is performed by the main CPU 5 according to a program stored in the memory 6. Since the operation up to the connection between the call destination terminal and the transfer destination terminal is the same as the conventional operation (see FIG. 6), the description of the operation up to the connection is omitted in FIG. Is shown.

When the office line transfer call, that is, the conference call is started by the connection, the process proceeds to step S1,
A determination is made whether a busy tone has been detected. The busy tone is detected by the key telephone apparatus 1 when the conference call ends and the calling terminal is hooked on. If this determination is negative, step S2
Then, it is determined whether or not a control signal, for example, a password and a service code of the extension terminal call have been sent from the transfer destination terminal. If this determination is negative, the process returns to step S1, and the detection of the busy tone is continued. Step S2
When the determination is affirmative, the process proceeds to step S3, where the key telephone apparatus 1 connects the hold tone transmission circuit 7 to the calling terminal station line and sends the hold tone to the calling terminal. Next, in step S4, incoming call control is performed on the extension terminal 10. In step S5, it is determined whether or not there is a response from the extension terminal 10. If the determination is affirmative, the extension terminal 10 is connected to the transfer destination terminal. Thereafter, the process proceeds to step S7, and it is determined whether or not an operation of terminating the call is performed from the extension terminal 10. If the determination is negative, the process returns to step S6, and the call between the extension terminal 10 and the transfer destination terminal is continuously performed. If the determination in step S7 is affirmative, the process proceeds to step S8, where the hold tone sent to the calling terminal is stopped, and subsequently, the conference call between the calling terminal and the transfer destination terminal is restored.

Next, when the conference call between the calling terminal and the transfer destination terminal is completed, that is, when the determination in step S1 is affirmative, the process proceeds to step S9 in FIG. Then, it is determined whether a service code has been detected. For this detection, the key telephone device 1 can wait, for example, for 30 seconds after detecting the busy tone. When the control signal, for example, the PIN code and the service code of the extension terminal call are detected during the 30 seconds, the process proceeds to step S10, for example, the guidance "Please wait for a while since the connection with the extension terminal will be established." Send to destination terminal. In step S11, the key telephone device 1 performs incoming call control on the extension terminal 10. In step S12, it is determined whether or not the extension terminal 10 has responded.
(0 second) If not, the process proceeds to step S15 to release the loop. If the determination in step S12 is affirmative,
Proceeding to step S13, connection between the extension terminal 10 and the transfer destination terminal is performed. In step S14, it is determined whether or not a busy tone has been detected. If the determination is affirmative, the process proceeds to step S15 to release the loop.

As described above, using the key telephone apparatus 1 of the present embodiment, during a conference call, the speaker of the transfer destination terminal interrupts the conference call and talks with the third party of the extension terminal 10. When a need arises, a call with the extension terminal 10 can be made in a state where the conference call is put on hold without disconnecting, so that there is an effect that operability is good. Further, even if the talker of the transfer destination terminal needs to talk to a third party of the extension terminal 10 after the conference call is terminated, the transfer destination terminal does not end the call, The extension terminal 10 can be called by inputting the service code and the service code.

Next, the operation of the network when calling an extension terminal using the key telephone apparatus 1 of this embodiment will be described with reference to FIG.
This will be described with reference to the sequence diagram of FIG. In addition,
FIG. 4 is a sequence diagram in a case where the speaker of the transfer destination terminal interrupts the conference call and talks with the extension terminal 10 during the conference call, and FIG. FIG. 3 shows a sequence diagram when a speaker talks with a third party at an extension terminal.

In FIG. 4, when a password and a service code for an extension terminal call are input from a transfer destination terminal during a conference call, the key telephone apparatus 1 sends a hold melody to the calling terminal. Subsequently, the key telephone device 1 performs incoming call control on the extension terminal 10 and, when a response is received from the extension terminal 10, connects the extension terminal 10 to the transfer destination terminal. As a result, a call can be made between the extension terminal 10 and the transfer destination terminal. When the extension terminal 10 performs the call termination operation after the call, the key telephone device 1 detects this, stops the melody on hold, and restores the first conference call. Thereafter, the same operation as in the related art is performed. Therefore, according to the present embodiment, during a conference call, a call can be made with a third party at the extension terminal without disconnecting the conference call.

In FIG. 5, after the call destination terminal is on-hook and the conference call is completed, when the password of the extension terminal call and the service code are inputted from the transfer destination terminal, the key telephone apparatus 1 transmits the call to the transfer destination terminal. For example, the guidance "Connecting to the extension terminal, so please wait for a while." Subsequently, the key telephone device 1 is the extension terminal 1
Incoming call control is performed on the extension terminal 10 and, when there is a response from the extension terminal 10, the extension terminal 10 is connected to the transfer destination terminal. As a result, a call can be made between the extension terminal 10 and the transfer destination terminal. When the call ends and the transfer destination terminal goes on-hook, the transfer between the transfer destination terminal and the second station and the key telephone apparatus 1 are performed.
A loop release operation is performed between the first station and the first station. According to this embodiment, the transfer destination terminal can talk with the third party of the extension terminal 10 after the conference call without disconnecting the conference call.

[0019]

According to the present invention, the transfer destination terminal can make a call by calling the extension terminal of the key telephone apparatus without re-calling after the transfer call is completed. For this reason,
One outgoing call can be effectively used, and the convenience is great and the economic effect can be expected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a key telephone device according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present embodiment.

FIG. 3 is a flowchart continued from FIG. 2;

FIG. 4 is a sequence diagram for explaining the operation of the network according to the embodiment.

FIG. 5 is a sequence diagram for explaining another operation of the network according to the embodiment.

FIG. 6 is a sequence diagram for explaining the operation of a conventional key telephone device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Button telephone apparatus, 2a, 2b, 2c ... Office line IF (interface), 3 ... Changeover switch 3, 4a, 4
b, 4c, 4d ... extension IF (interface), 5 ... main CPU 5, 6 ... memory, 7 ... hold sound transmission circuit, 8 ...
Office line transfer circuit, 9 ... message sending circuit, 10 ... extension terminal.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-145643 (JP, A) JP-A-61-171297 (JP, A) JP-A-1-272357 (JP, A) JP-A-3- 126352 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04M 3/58 H04M 3/54 H04Q 3/58 107

Claims (1)

(57) [Claims] 1. A telephone number of a transfer destination is registered in a memory in advance.
When there is an incoming call, the calling terminal and the telephone number
A key telephone device having a line transfer function for connecting to a transfer destination terminal , wherein the call destination terminal first performs a call termination operation after the connection between the call destination terminal and the transfer destination terminal. To detect the end state
End-of- call state detection means, means for detecting a control signal requesting an extension connection sent from the transfer destination terminal after the end- of-call state is detected by the end- of-call state detection means, and after detecting the control signal , Perform incoming call control to the extension terminal,
A key telephone device comprising: means for switching to a call between the transfer destination terminal and the extension terminal by a response operation of the extension terminal.