JP3895601B2 - IP telephone and telephone system provided with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an IP (Internet Protocol) telephone that makes a call over a network, a telephone system including the telephone, and a communication method for the IP telephone.
[0002]
[Prior art]
In a so-called private telephone system, a large number of IP telephones are connected to each other via a PBX (Private Branch Exchange) and a LAN. For example, when a call is made from one IP phone to another IP phone, the IP address corresponding to the caller telephone number from the caller IP phone is sent to the PBX, and a line between the caller IP phone and the PBX is secured. After that, the destination telephone number is sent to the PBX from the source IP telephone. The PBX refers to the table to check the destination IP address corresponding to the destination telephone number, and secures a line with the destination IP telephone based on the destination IP address.
[0003]
[Problems to be solved by the invention]
However, in the prior art, when a call is made from one IP phone to another IP phone, it is always necessary to go through the PBX. Therefore, the equipment cost increases, and even if an attempt is made to conduct a call test during the construction of a private telephone system. If the PBX connection and various settings are not completed, a call test cannot be performed.
[0004]
The present invention pays attention to such a conventional problem, and an object thereof is to provide an IP telephone that can suppress the equipment cost of a private telephone system and can perform a call test without using a PBX. .
[0005]
[Means for Solving the Problems]
An IP telephone for achieving the object is
A number-address storage area for storing a destination telephone number and an IP address corresponding to the telephone number;
A setting registration means for setting and registering a destination telephone number and an IP address corresponding to the telephone number in the number-address storage area;
A telephone number receiving means for receiving the telephone number of the destination;
Call control means for referring to the number-address storage area, grasping an IP address corresponding to a telephone number of a call destination accepted by the telephone number accepting means, and performing call control based on the IP address;
Ring back tone transmission means for transmitting a ring back tone to the destination when receiving a call acceptance signal for the call signal from the destination after transmitting a call signal to the destination When,
A loop forming means for receiving a call signal from a caller and setting a loop state in which a voice signal from the caller is sent back to the caller;
It is characterized by having.
[0007]
In addition, a communication method of an IP telephone for achieving the above object is as follows:
A setting registration process for setting and registering a destination telephone number and an IP address corresponding to the telephone number in the number-address storage area;
A phone number reception process for receiving a destination phone number;
A call control process for referring to the number-address storage area, grasping an IP address corresponding to a telephone number of a callee accepted by the telephone number accepting means, and performing call control based on the IP address;
A ring back tone transmission process for transmitting a ring back tone to the destination when a call acceptance signal for the call signal is received from the destination after transmitting a call signal to the destination When,
When receiving a call signal from a caller, a loop forming process for setting a loop state in which a voice signal from the caller is sent back to the caller;
Is executed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a private telephone system according to the present invention will be described with reference to the drawings.
[0009]
As shown in FIG. 1, the private telephone system in the present embodiment includes a plurality of IP telephones 10, 10,..., A LAN line 2 and a hub 1 for connecting them, and a plurality of ordinary telephones 4, 4,. ..., and a normal line 5 and a PBX 30 for connecting them to each other. The hub 1 and the PBX 30 are connected by a LAN line 3.
[0010]
As shown in FIG. 2, the IP telephone 10 includes a handset 11 provided with a speaker 11a and a microphone 11b, a hook switch 12 for detecting whether or not the handset 11 has been removed, a display panel 13, Push button group 14 such as dial buttons and other function buttons, drive circuit 15 such as hook switch 12, display panel 13 and push button group 14, call control circuit (call control means) 21 for performing call control, and handset 10 is a communication circuit (communication means) 22 for realizing a telephone call, a tone transmission circuit 23 for transmitting various tones such as a dial tone (DT) and a ringback tone (RBT), and an interface circuit for the LAN line 2 26, and the telephone numbers of the plurality of IP telephones 10, 10,. Recording is the number - address table - and (number address storage area) 27, and a main control circuit 20 for controlling the various circuits, a. The tone transmission circuit 23 includes a dial tone transmission circuit 24 that transmits a dial tone to the speaker 10 a of the handset 11, and a ring back tone transmission circuit that transmits a ringback tone to the destination telephone via the interface circuit 26. 25.
[0011]
In the present embodiment, the IP telephone setting registration means, telephone number reception means, mode reception means, and data request means all have a push button group 14, a drive circuit 15 thereof, and a main control circuit 20. Configured. The ring back tone transmission means and the dial tone transmission means include a tone transmission circuit 23 and a main control circuit 20. The mode setting unit and the data request receiving unit are configured to include a call control circuit 21 and a main control circuit 20.
[0012]
The PBX 30 includes a LAN side interface circuit 31 for the LAN 3, a normal line side interface circuit 32 for the normal line 5, a switch circuit 33 that connects the interface circuits 31 and 32, and a main control circuit 34 that controls these circuits. , A number-address table 35 in which telephone numbers of a plurality of IP telephones 10, 10,... And corresponding IP addresses are registered, and telephone numbers in which telephone numbers of a plurality of normal telephones 4, 4,. And a table 36.
[0013]
Next, a data registration operation in the number-address table 27 will be described with reference to the flowchart shown in FIG.
[0014]
The user or telephone installer has other IP telephones connected to the IP telephone in which telephone numbers and IP addresses for all IP telephones constituting the private telephone system have already been set and registered. (Step 1), and if there is one that is set and registered, an IP telephone in which a telephone number or the like is set and registered by operating a specific push button in the push button group 14 To request data such as a telephone number (step 2). At this time, the data request is made through the main control circuit 20, the call control circuit 21, and the interface circuit 26 in accordance with the operation of the push button group 14 by the user or the like. The line connection operation between IP telephones will be described later.
[0015]
When a registered telephone number or the like is transmitted from another IP telephone in response to this data request, the call control circuit 21 and the main control circuit 20 accept it (step 3), as shown in FIG. This is set and registered in the number-address table 27 (step 4). In this number-address table 27, as shown in the figure, a telephone number for a certain telephone and its IP address are registered as a pair.
[0016]
In step 1, when the user or the like determines that there is no other IP telephone connected to the IP telephone in which the telephone number or the like is already set and registered, the user or the like himself / herself sets the telephone number or the like. Proceed to step 5 to enter. In step 5, the user or the like himself / herself operates the push button group 14 to input a telephone number related to the IP telephone constituting the private telephone system (step 5). At this time, the main control circuit 20 determines whether or not the input telephone number has a significant number of digits (step 6). If the number is not significant, the display panel 13 indicates that the input telephone number is not the number of significant digits. To prompt the user to input again. If the number is significant, the main control circuit 20 determines whether or not the telephone number has already been input (step 7). If the telephone number has already been input, the main control circuit 20 displays that the telephone number is duplicated. The information is displayed on the panel 13, and the user is prompted to input another telephone number. If the telephone number has not been input, an instruction to input an IP address corresponding to the input telephone number is displayed on the display panel 13. The user or the like sees this display and operates the push button group 14 to input the IP address corresponding to the input telephone number (step 8). At this time, the main control circuit 20 determines whether or not the input IP address is a valid class or an input IP address (steps 9 and 10). If there is, the fact is displayed on the display panel 13. When the main control circuit 20 determines that the input IP address is a valid class and is not an input IP address, the telephone number input in step 5 and the IP address input in step 8 are number-address table. 27 is registered (step 11). Next, the main control circuit 20 displays on the display panel 13 whether or not the telephone numbers of all IP telephones have been input, and there is an input indicating that the telephone numbers of all IP telephones have been input from the user or the like. If there is no input from the user or the like, the user is prompted to enter another telephone number, and the process returns to step 5.
[0017]
Next, the setting of the direct mode and the canceling operation thereof will be described with reference to the flowchart shown in FIG.
[0018]
The IP telephone 10 of the present embodiment has two modes: a direct mode in which a telephone call can be made directly with another IP telephone without using the PBX 30, and a normal mode in which a telephone call can be made with another telephone through the PBX as in the prior art. Mode setting is possible. Therefore, the operation when switching to the normal mode by setting and releasing the direct mode will be described below.
[0019]
First, when a user or the like performs a mode setting operation with the push button group 14, the main control circuit 20 accepts this (step 21), activates an input time timer (step 22), and prompts the user to input a password. The contents are displayed on the display panel 13. This password is given to a specific administrator so that all users cannot freely switch modes. When a password is input by operating the push button group 14 (step 23), the main control circuit 20 waits until the input time timer times out (step 24), and the input password is set in advance. Whether the password is valid or not (step 25), if the password is not valid, the mode setting routine is terminated. If the password is valid, the display panel prompts the user to input the direct mode setting or direct mode release. 13 and waits for any input (step 26). When the direct mode release is input by operating the push button group 14, the main control circuit 20 sets the call control circuit 21 to the normal mode, in other words, turns off the direct mode (step 33). When the direct mode setting is input, the call control circuit 21 is set to the direct mode, in other words, the direct mode is turned on (step 27). When the main control circuit 20 sets the call control circuit 21 to the direct mode, the main control circuit 20 immediately starts the no-operation time timer (step 28), and then any of the push buttons or the handset 11 in the push button group 14 or the like It is determined whether or not an operation has been performed (step 29). If any push button or handset 11 or the like is operated, the no-operation time timer is stopped (step 30), and it is immediately determined again whether or not the push button or handset 11 is operated (step 31). ). If there is an operation such as a push button, the process returns to step 30; if there is no operation such as a push button, the process returns to step 28, and the no-operation time timer is started again. That is, in steps 28 to 31, the timer is stopped as long as the push button or the like is continuously operated, and the timer is started again when the operation is interrupted. When it is determined in step 29 that there is no operation of the push button or the like, the main control circuit 20 determines whether or not the non-operation time has timed out (step 32). If so, the process proceeds to step 33 to turn off the direct mode.
[0020]
Next, call control between IP telephones in the direct mode described above will be described with reference to FIG.
[0021]
When the destination telephone number is input to the source IP telephone, the call control circuit 20 refers to the number-address table 27 to check the IP address corresponding to the destination telephone number, and this IP address. A call signal is transmitted using (step 41). The destination IP telephone receives the call signal directly without going through the PBX 30, returns it, transmits the call acceptance signal to the destination (step 42), and triggers the transmission of the call acceptance signal. Then, a loop setting (step 43) is performed in which the voice signal from the transmission source is sent back to the transmission source.
[0022]
When receiving the call acceptance signal, the source IP telephone transmits a ring back tone to the destination (step 44). Since the destination IP telephone is set in a loop, the ring back tone transmitted by the caller returns to the caller, and the caller hears this ring back tone. When the destination goes off-hook (step 45), the destination IP telephone transmits a response signal to the source (step 46). When receiving the response signal from the call destination, the caller IP telephone stops transmitting the ring back tone and sets the communication state in which communication is possible (step 47), and transmits a response acceptance signal to the call destination. (Step 48). When receiving the response acceptance signal, the destination IP telephone cancels the loop setting and enters a connection state in which communication is possible (step 49). As a result, a call can be made between the caller and the callee (step 50). After the call is finished, if the source IP telephone is in an on-hook state (step 51), a disconnection signal is transmitted to the destination (step 52). Further, when the destination IP telephone is in an on-hook state after the call is finished, a disconnection signal is transmitted to the source (step 53).
[0023]
Next, according to the flowchart shown in FIG. 7, the detailed operation of the source IP telephone in the direct mode will be described.
[0024]
When the handset 11 is removed, the hook switch 12 detects this and notifies the main control circuit 20 of off-hook (step 61). When the main control circuit 20 recognizes the off-hook, it stops the no-operation time timer as described in Step 30 of FIG. 5 (Step 62), and causes the dial tone transmission circuit 24 to transmit a dial tone (Step 63). ). As a result, the caller who has removed the handset 11 will hear a dial tone from the handset 11. Next, when the caller operates the push button group 14 to input the telephone number of the callee, and the main control circuit 20 accepts this (step 64), the dial tone transmission circuit 24 receives the dial tone. Is stopped (step 65). In parallel with this, the call control circuit 21 refers to the number-address table 27 to obtain an IP address corresponding to the destination telephone number accepted by the main control circuit 20 (step 66), and obtains this IP address. The used call signal is transmitted via the LAN 2 without going through the PBX 30 (step 67), and the call reception signal is waited (step 68).
[0025]
Waiting for this call acceptance signal, when the handset 11 on the source side goes into an on-hook state and the hook switch 12 detects this, the call control circuit 21 transmits a disconnection signal to the destination (step 69), and the main control circuit. 20 starts a no-operation time timer (step 76).
[0026]
When the call control circuit 21 waits for a call acceptance signal in step 68 and receives a call acceptance signal from the call destination, the main control circuit 20 sends a ring back tone to the ring back tone transmission circuit 25. A call is made (step 70), and a response is waited (step 71). At this time, as described above with reference to FIG. 6, since the call circuit 20 is set in a loop when the call acceptance signal is transmitted to the call origin (step 42), the call destination is the ring from the call origin. The back tone loops through the call circuit 20 of the call destination, passes through the call circuit 20 of the call source, and reaches the handset 11 of the call source. The call source hears this ring back tone.
[0027]
When the sender handset 11 is in the on-hook state while waiting for a response in step 71, as described above, the process is terminated through steps 69 and 76. When the disconnection signal is received, the main control circuit 20 receives the signal from the hook switch 12. After waiting for the on-hook signal (step 75), the no-operation time timer is started (step 76).
[0028]
When a response signal is received from the call destination while waiting for a response in step 71, the main control circuit 20 causes the ring back tone transmission circuit 25 to stop transmitting the ring back tone, and the call control circuit 21 The call circuit 22 is brought into a connection state where communication is possible (step 72), and when a response acceptance signal is transmitted (step 73), an actual call can be made (step 74). When the caller handset 11 is in an on-hook state in this call-enabled state, as described above, the process is terminated through steps 69 and 76. Upon reception of the disconnection signal, the main control circuit 20 receives the signal from the hook switch 12. After waiting for the on-hook signal (step 75), the no-operation time timer is started (step 76).
[0029]
When the call control circuit 21 receives a response signal from the call destination while waiting for a call acceptance signal in step 68, the processing in step 73 described above is performed.
[0030]
In the normal mode, as described in the section of the prior art, when the destination telephone number is input, the IP address of the source is sent to the PBX 30, and between the IP telephone of the source and the PBX 30 After the line is established, call control with the call destination is performed via the PBX 30 using the call destination telephone number.
[0031]
Next, detailed operation of the destination IP telephone will be described with reference to the flowchart shown in FIG.
[0032]
When receiving a call signal from the caller (step 81), the main control circuit 20 analyzes the call control information included in the call signal, and the caller mode information in the call control information is set to the direct mode. Or the normal mode (step 82), the call control circuit 21 is set to a mode suitable for the transmission source, that is, if the transmission source is the normal mode, the normal mode is set (step 83), and the transmission source is the direct mode. If the mode is selected, the direct mode is set (step 85). In the normal mode, the call control with the caller is performed through the PBX 30 as in the prior art (step 84). In the normal mode, the source may be the IP telephone 10 or the normal telephone 4 in the present embodiment.
[0033]
When the call control circuit 21 is set to the direct mode (step 85), the call control circuit 21 transmits a call acceptance signal to the caller without passing through the PBX 30 (step 86). The main control circuit 20 sets the call circuit 22 in a loop state in which the voice signal of the caller is sent back to the caller with the transmission of the call acceptance signal. At this time, since the ring back tone is transmitted from the transmission source (step 70 in FIG. 7), the call circuit 22 sends this ring back tone back to the transmission source (step 87). The main control circuit 20 further generates a ringing tone from a microphone not shown (step 88).
[0034]
The main control circuit 20 waits for the hook switch 12 to detect off-hook (step 89), and when off-hook is detected, stops the ringing tone (step 90). When the off-hook is detected, the call control circuit 21 transmits a response signal to the caller (step 91) and waits for a response acceptance signal from the caller (step 92).
[0035]
If on-hook is detected while waiting for a response acceptance signal, the main control circuit 20 cancels the loop setting of the call circuit 22 (step 93), and then the call control circuit 21 transmits a disconnection signal to the caller. (Step 94). When a response reception signal is received from the caller while waiting for a response reception signal, the loop setting of the call circuit 22 is canceled, and the call control circuit 21 sets the call circuit 22 in a connection state where communication is possible. (Step 95). When on-hook is detected in this state where communication is possible (step 96), as described above, the call control circuit 21 transmits a disconnection signal to the caller (step 94). End with the disconnected state. If a disconnection signal is received while waiting for a response acceptance signal, the call control circuit 21 disconnects the call circuit 22 from the loop setting of the call circuit 22 and ends. If a disconnection signal is received while waiting for off-hook in step 89, the main control circuit 20 stops the ringing tone and then proceeds to step 98 described above.
[0036]
As described above, in the IP telephone according to the present embodiment, when the destination telephone number is input after the direct mode is set, the IP address corresponding to the registered destination telephone number is checked, and this IP address Based on the above, since direct call control is performed with the destination IP telephone, a private telephone system without PBX can be constructed. Note that when a private telephone system without PBX is constructed, it is preferable not to use the normal mode as a main body but to use the direct mode as a main body or only the direct mode as in the above embodiment.
[0037]
In the present embodiment, as described above, since a call can be made without PBX, a call test can be performed even if connection and various settings of PBX are not completed. Furthermore, in this embodiment, since the ring back tone is returned from the transmission source from the transmission source, even if there is no worker at the transmission destination in the call test, if the ring source listens to this ring back tone at the transmission source. Since it can be ascertained that the line connection with the destination is reliably established, the necessary personnel for the call test can be reduced.
[0038]
In this embodiment, since the direct mode and the normal mode can be switched, by providing the PBX, it is possible to make a call with not only the IP phone but also the normal phone.
[0039]
【The invention's effect】
According to the present invention, by registering the destination telephone number and the corresponding IP address in the number-address storage area, if the destination telephone number is entered, the corresponding destination telephone number can be entered. The IP address is checked, and direct call control is performed with the destination IP telephone based on the IP address. Therefore, it is possible to construct a private telephone system without PBX, to reduce the equipment cost, and to perform a call test even if the PBX connection and various settings are not completed.
[0040]
In addition, in the case where the ring back tone transmission means is provided, the ring back tone from the ring back tone transmission means returns from the transmission source. Even if it is not, if the ring back tone is heard at the source, it can be understood that the line connection with the destination is surely made, and the necessary personnel for the call test can be reduced.
[0041]
In addition, since the mode receiving means can be switched between the direct mode and the normal mode, by providing the PBX, it is possible to make a call with not only an IP phone but also a normal phone.
[Brief description of the drawings]
FIG. 1 is a system diagram of a private telephone system according to an embodiment of the present invention.
FIG. 2 is a circuit block diagram of an IP telephone according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a registration procedure of a telephone number and an IP address in an embodiment according to the present invention.
FIG. 4 is an explanatory diagram showing a configuration of a number-address table in an embodiment according to the present invention.
FIG. 5 is a flowchart showing direct mode setting and canceling operations according to an embodiment of the present invention.
FIG. 6 is a sequence diagram of call control between IP telephones according to an embodiment of the present invention.
FIG. 7 is a flowchart showing a call control operation of a caller IP telephone according to an embodiment of the present invention.
FIG. 8 is a flowchart showing a call control operation of a destination IP telephone according to an embodiment of the present invention.
[Explanation of symbols]
2, 3 ... LAN, 4 ... Normal telephone, 10 ... IP telephone, 11 ... Handset, 12 ... Hook switch, 13 ... Display panel, 14 ... Push button group, 20 ... Main control circuit, 21 ... Call control circuit, 22 ... Call circuit 23 ... tone transmission circuit 24 ... dial tone transmission circuit 25 ... ring back tone transmission circuit 26 ... interface circuit 30 ... PBX

Claims (4)

In an IP (Internet Protocol) telephone that communicates via a network,
A number-address storage area for storing a destination telephone number and an IP address corresponding to the telephone number;
A setting registration means for setting and registering a destination telephone number and an IP address corresponding to the telephone number in the number-address storage area;
A telephone number receiving means for receiving the telephone number of the destination;
Call control means for referring to the number-address storage area, grasping an IP address corresponding to a telephone number of a call destination accepted by the telephone number accepting means, and performing call control based on the IP address;
Ring back tone transmission means for transmitting a ring back tone to the destination when receiving a call acceptance signal for the call signal from the destination after transmitting a call signal to the destination When,
A loop forming means for receiving a call signal from a caller and setting a loop state in which a voice signal from the caller is sent back to the caller;
An IP telephone comprising: The IP phone according to claim 1 ,
Based on the IP address corresponding to the destination telephone number received by the telephone number receiving means, the direct mode in which call control is performed by the call control means, and the destination telephone number received by the telephone number receiving means Based on a mode receiving means for receiving a setting to either one of a normal mode in which call control is performed by the call control means,
The call control means includes
When the mode accepting unit accepts the setting of the direct mode, when the telephone number accepting unit accepts the destination telephone number, the call control is performed based on the IP address corresponding to the destination telephone number, In the call control, a call signal indicating the direct mode is output to the call destination,
When the mode accepting unit accepts the setting of the normal mode, when the telephone number accepting unit accepts the destination telephone number, the call control is performed based on the destination telephone number. In the call control, Outputting a call signal indicating the normal mode to the destination side;
An IP telephone characterized by the above. The IP phone according to claim 2 ,
When the call control means accepts the call signal from the caller, based on the call signal, determines whether the caller is the direct mode or the normal mode, and the caller is in the direct mode Comprises setting the call control means to the direct mode, and when the caller is in the normal mode, the call control means to set the call control means to the normal mode ,
When the mode setting means sets the call control means to the direct mode, when the loop forming means receives the call signal from the caller, it sends back a voice signal from the caller to the caller. Put it in a loop ,
An IP telephone characterized by the above. In a communication method of an IP (Internet Protocol) telephone that performs communication via a network,
A setting registration process for setting and registering a destination telephone number and an IP address corresponding to the telephone number in the number-address storage area;
A phone number reception process for receiving a destination phone number;
A call control process for referring to the number-address storage area, grasping an IP address corresponding to a telephone number of a callee accepted by the telephone number accepting means, and performing call control based on the IP address;
A ring back tone transmission process for transmitting a ring back tone to the destination when a call acceptance signal for the call signal is received from the destination after transmitting a call signal to the destination When,
When receiving a call signal from a caller, a loop forming process for setting a loop state in which a voice signal from the caller is sent back to the caller;
A communication method for an IP telephone, comprising:

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