JP4292017B2 - IP phone terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an IP telephone terminal having a public switched telephone network (PSTN) connection function and an IP (Internet Protocol) telephone function, and more particularly to an IP telephone terminal and method for transferring a calling telephone number notification to a plurality of telephones.
[0002]
[Prior art]
In recent years, the use of the Internet via broadband lines has become widespread, and IP phones using the Internet protocol have been actively developed. In general, an IP telephone terminal that connects a telephone to an IP telephone network using CATV (CAble TeleVision), ADSL (Asymmetric Digital Subscriber Line), FTTH (Fiber To The Home), etc. has a PSTN connection function. There are many.
[0003]
Further, depending on the contract, the user can use the calling telephone number receiving function (number display function). This calling telephone number receiving function receives information such as the telephone number of the calling line before communication and presents it to the user when there is an incoming call to the user's telephone. As a technology related to this, there is an invention disclosed in Japanese Patent Laid-Open No. 2001-16359.
[0004]
In the data communication apparatus disclosed in Japanese Patent Laid-Open No. 2001-16359, an external telephone is added when an information receiving terminal activation (CAR) signal coming from the exchange side and number display information notified from the exchange side are detected. Disconnects from the subscriber line and DC is captured by the power supply means of the call signal generating means, and a reception completion signal is returned to the exchange. Therefore, a reception completion signal is generated inside the facsimile apparatus for the exchange, and a call that arrives from the exchange continues. After detecting the signal, the line is switched to an external telephone to make a call state. As a result, it is possible to preferably perform a telephone call or data communication regardless of the off-hook timing of the external telephone.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-16359
[Problems to be solved by the invention]
In an IP telephone terminal having a configuration in which a plurality of telephones are connected in a branch to one telephone line, when a PSTN call is received together with a calling telephone number notification, a CAR signal is first transmitted to the plurality of telephones.
[0007]
However, since the timing of the primary response (DC loop) with respect to the CAR signal differs for each telephone, a modem signal is transmitted from the exchange at the timing of the telephone that first responded first. On the other hand, a telephone with a slow primary response has a problem that it cannot receive a calling telephone number correctly because it is judged that the CAR signal has been interrupted by the telephone that has made the primary response first or the modem signal cannot be received from the exchange. .
[0008]
Further, in the data communication apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2001-16359, when the CAR signal and number display information are detected from the exchange side, it is preferable to call or data regardless of the off-hook timing of the external telephone. Although communication is possible, it is impossible to solve the problem when a plurality of telephones are notified of a calling telephone number.
[0009]
The present invention has been made to solve the above problems, its object is to provide an IP telephone terminal end capable correctly transferring the caller telephone number notification to multiple phones.
[0010]
[Means for Solving the Problems]
The IP telephone terminal according to claim 1 is an IP telephone terminal to which a plurality of telephones are connected, and the plurality of telephones are connected to an IP telephone network and a public switched telephone network. Receiving means for extracting the outgoing telephone number of the other party's telephone contained in the packet and sending an information communication terminal activation signal to a plurality of telephones, and making a call to the telephone that has received the primary response Control means for sending a telephone number as a modem signal and sending a call signal to a telephone that has sent a reception completion signal, and a plurality of telephones can be connected to the public telephone network without going through the receiving means and the control means. A plurality of switches that can be connected to the control circuit, and when there is an incoming call through the public switched telephone network, the control means switches the switches to switch the modem signal through the public switched telephone network. It received, extracts the calling telephone number of the other party phone included in the modem signal, the calling telephone number and sends the modem signals to the telephone there is a primary response.
[0011]
The control means sends an information communication terminal activation signal to a plurality of telephones, sends a calling telephone number as a modem signal to a telephone that has made a primary response, and a calling signal to the telephone that sent a reception completion signal. since delivering, it is possible to notify correctly calling telephone number to multiple phones.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a connection example of an IP telephone terminal according to an embodiment of the present invention. An IP telephone terminal 1 is connected to telephones 2 and 3 via TEL interfaces (hereinafter abbreviated as TEL IF) 11 and 12, and is connected via a 10BaseT interface (hereinafter also referred to as LAN (Local Area Network) IF) 13. Are connected to the LAN 4 and connected to the public switched network 8 via a PSTN interface (hereinafter abbreviated as PSTN IF) 14.
[0021]
The PC 5 can acquire log information and the like from the IP telephone terminal 1 via the LAN 4. The PC 5 can also acquire log information and the like from the IP telephone terminal 1 via the Internet 7 and the GW (gateway) 6.
[0022]
The telephones 2 and 3 have a number display function, and can receive caller information of a partner PSTN telephone or IP telephone and display the caller information. By viewing the caller information, the user can reject the incoming call or make a call after confirming the caller in advance. The number display function has two types: a function for notifying a number when an incoming call is received and a function for notifying the number of a caller who has received an incoming call during communication.
[0023]
FIG. 2 is a diagram showing another connection example of the IP telephone terminal in the embodiment of the present invention. The IP telephone terminal 1 is connected to the telephones 2 and 3 through the TEL IFs 11 and 12, is connected to the LAN 4 through the 10BaseT interface 13, is connected to the public switching network 8 through the PSTN IF 14, and is a DSL interface such as ADSL. 15 is connected to the Internet 7.
[0024]
The PC 5 can acquire log information and the like from the IP telephone terminal 1 via the LAN 4. The PC 5 can also obtain log information and the like from the IP telephone terminal 1 via the Internet 7 and the DSL interface 15.
[0025]
FIG. 3 is a block diagram showing a schematic configuration of the IP telephone terminal in the embodiment of the present invention. The IP telephone terminal 1 includes a TEL IF 11 and 12, a LAN IF 13, a PSTN IF 14, a DSL IF 15, a DSP (Digital Signal Processor) 16 that performs various signal processing, a CODEC 17 that compresses / decompresses an audio signal, A call detection / loop circuit 20 that detects a call from the public switched network 8 via the PSTN IF 14 and performs loop generation processing via SLIC (Subscriber Line Interface Circuit) 18 and 19 provided corresponding to the telephones 2 and 3. A hook detection circuit 21 for detecting off-hook / on-hook of the telephone 2 or 3, switches A22 and 23, switches B24 and 25, a storage unit 26 in which a control program, log information, and the like of the IP telephone terminal 1 are stored PHY unit 27 for controlling the physical layer of LAN and P for controlling the physical layer of DSL It includes a Y unit 28, and a control unit 29 for performing IP telephone terminal 1 overall control.
[0026]
The control unit 29 is realized by a CPU (Central Processing Unit) executing a control program stored in the storage unit 26. The control program may be downloaded via the DSL IF 15 and the Internet 7 and stored in the storage unit 26, or may be downloaded via the LAN IF 13 and the LAN 4 and stored in the storage unit 26.
[0027]
The PHY unit 27 is a part that controls the physical layer of the LAN, and performs data communication with devices such as the PC 5 connected to the LAN 4 under the control of the control unit 29. The PHY unit 28 controls the physical layer of the DSL, and performs data communication with devices such as an IP telephone exchange and a PC connected to the Internet 7 under the control of the control unit 29.
[0028]
SLICs 18 and 19 perform off-hook detection processing, ringer signal generation processing, and the like of telephones 2 and 3, respectively.
[0029]
FIG. 4 is a flowchart for explaining the processing procedure of IP telephone terminal 1 in the embodiment of the present invention when a PSTN call is received. First, in order to determine whether there is an incoming call from the PSTN via the PSTN IF 14, the call detection / loop circuit 20 detects the CAR signal (S11). When the call detection / loop circuit 20 detects the CAR signal (S11, Yes), it notifies the control unit 29 accordingly.
[0030]
Upon receiving the notification of CAR signal detection, the control unit 29 instructs the call detection / loop circuit 20 to generate a loop corresponding to the primary response (S12). In addition, the control unit 29 controls the switches A22 and A23 so that the CODEC 17 is connected to the PSTN side (lower side) (S13).
[0031]
Next, since a modem signal is sent from the public line network 8, the CODEC 17 and the DSP 16 receive the modem signal and notify the control unit 29 of the contents. The control unit 29 receives the contents and determines whether or not the calling telephone number has been correctly received (S14). If the calling telephone number cannot be correctly received (S14, No), the control unit 29 returns the switches A22 and 23 to the original state as shown in FIG. 3 (S15), and proceeds to Step 20.
[0032]
When the calling telephone number is correctly received (S14, Yes), in order to send a reception completion signal to the PSTN switch, the call detection / loop circuit 20 is instructed to open the loop (S16). The switches A22 and 23 are restored as shown in FIG. 3 (S17).
[0033]
Next, the control unit 29 controls the SLICs 18 and 19 and the DSP 16 to retransmit the telephone number to the telephones 2 and 3 via the TEL IFs 11 and 12 (S18). Details of this process will be described later.
[0034]
Next, the control unit 29 controls the switches B24 and B25 so that the TEL IFs 11 and 12 are connected to the PSTN side (lower side) (S19). As a result, a call signal from the PSTN switch is directly output to the telephones 2 and 3, and the telephones 2 and 3 are caused to ring.
[0035]
Next, the control unit 29 causes the hook detection circuit 21 to detect the off-hook of the telephone 2 or 3 (S20). When the hook detection circuit 21 detects off-hook (S20, Yes), the first off-hook telephone of the telephones 2 and 3 receives the incoming call, and a call is made with the caller. At this point, the ringing signal from the PSTN switch is also stopped and the ringing of other telephones is also stopped.
[0036]
Next, the control unit 29 restores the switch B corresponding to the telephone other than the telephone on which the off-hook has been performed as shown in FIG. 3 (S22). Thereafter, the control unit 29 waits for the hook detection circuit 21 to detect on-hook, and if the on-hook is detected (S23, Yes), returns the switch B corresponding to the telephone to the original state as shown in FIG. (S24), the process returns from the beginning.
[0037]
Further, when the stop of the calling signal from the PSTN switch is detected (S20, SPTN stop), the switches B24 and 25 are returned to the original state as shown in FIG. 3 (S21), and the process returns from the beginning.
[0038]
FIG. 5 is a flowchart for explaining details of the processing procedure of step S18 (telephone number re-transmission processing) in FIG. First, the control unit 29 controls the SLICs 18 and 19 to invert the polarity (S31), generates a CAR signal, and outputs it to the telephones 2 and 3 (S32).
[0039]
If there is a primary response from the telephone (S33, Yes), the control unit 29 controls the DSP 16 to send a modem signal to the telephone (S34). Then, the control unit 29 causes the hook detection circuit 21 to detect a reception completion signal (loop break) from the telephone. When the hook detection circuit 21 detects the reception completion signal, the process proceeds to step S19 in FIG. The process shown in FIG. 5 is performed for all telephones connected to IP telephone terminal 1.
[0040]
In the above explanation, the telephone numbers sent from the PSTN exchange are notified to the telephones 2 and 3. Next, a case where the telephone numbers sent from the IP telephone exchange are notified to the telephones 2 and 3 will be described.
[0041]
FIG. 6 is a diagram showing an example of a packet at the time of outgoing call from the IP telephone. This packet has a packet format defined in RFC (Request For Comments) 3261 of SIP (Session Initiation Protocol), but is not limited thereto.
[0042]
As shown in FIG. 6, in SIP, the control content is handled as text data, and “INVITE” is described in the first line of the encoded message. Subsequent lines are a list of header fields. In the first line “INVITE”, an operation that the caller wants the server to perform is specified.
[0043]
The Call-ID header field contains a unique identifier for grouping consecutive messages. The contact header field specifies a SIP Uniform Resource Identifier (SIP) or SIPS URI that can be used to contact a specific instance in subsequent requests.
[0044]
The Content-Length header field specifies the length of the message body. The Content-Type header field specifies the Internet media type of the message body.
[0045]
The CSeq header field includes information for identifying and ordering transactions, and includes a sequence number and a method. The From header field contains the caller's logical identifier. Here, it corresponds to the telephone number of the caller.
[0046]
The Max-Forwards header field contains information for limiting the number of hops that can be passed in the process of outgoing calls to the called party. The Record-Route header field contains information required for routing. The To header field specifies the logical identifier of the recipient. The Via header field indicates the transport used for the transaction. Note that parameters at the time of communication are designated in the lines after v = 0.
[0047]
FIG. 7 is a flowchart for explaining the processing procedure of IP telephone terminal 1 in the embodiment of the present invention when there is an incoming call from the IP telephone. First, the control unit 29 determines whether or not an outgoing packet (see FIG. 6) is received from the IP telephone via the LAN IF 13 or the DSL IF 15, and determines whether there is an incoming call from the IP telephone. (S41).
[0048]
If there is an incoming call from the IP telephone (S41, Yes), the originating telephone number (From header field) included in the received packet is extracted (S42). Then, the control unit 29 controls the SLICs 18 and 19 and the DSP 16 to retransmit the telephone number to the telephones 2 and 3 via the TELIFs 11 and 12 (S43). This processing is the same as the processing procedure described with reference to FIG. Therefore, detailed description will not be repeated.
[0049]
Next, the control unit 29 controls the SLICs 18 and 19 to send a calling signal to the telephones 2 and 3 (S44). Then, the control unit 29 causes the SLICs 18 and 19 to detect the off-hook of the telephone 2 or 3 (S45). When the SLIC 18 or 19 detects off-hook (S45, Yes), the incoming call is received by the first off-hook telephone of the telephones 2 and 3, and a call is made with the caller. At this point, the control unit 29 stops the ringing signal for the other SLIC and stops the ringing of other telephones.
[0050]
Thereafter, the control unit 29 waits for the on-hook to be detected by the SLIC corresponding to the telephone that has been off-hook, and if on-hook is detected (S46, Yes), returns to the process from the beginning.
[0051]
If the stop of the call from the IP telephone exchange is detected (S45, IP telephone stop), the process returns from the beginning.
[0052]
As described above, according to IP telephone terminal 1 in the present embodiment, when a PSTN call is received together with a calling telephone number notification, the outgoing telephone number is retransmitted to each telephone after receiving the calling telephone number. As a result, it has become possible to reliably notify the calling telephone number to a plurality of telephones.
[0053]
Also, when there is an incoming call from an IP telephone, the outgoing telephone number included in the packet at the time of outgoing call is extracted and the outgoing telephone number is sent to each telephone. The existing number display function can be used effectively.
[0054]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0055]
【The invention's effect】
According to the IP telephone terminal of the first aspect, the control means transmits an information communication terminal activation signal to a plurality of telephones, and transmits a calling telephone number as a modem signal to the telephone that has made a primary response. Since the calling signal is sent to the telephone that has sent the reception completion signal, it becomes possible to correctly notify the calling telephone number to a plurality of telephones.
[Brief description of the drawings]
FIG. 1 is a diagram showing a connection example of an IP telephone terminal in an embodiment of the present invention.
FIG. 2 is a diagram showing another connection example of the IP telephone terminal in the embodiment of the present invention.
FIG. 3 is a block diagram showing a schematic configuration of an IP telephone terminal in an embodiment of the present invention.
FIG. 4 is a flowchart for explaining a processing procedure of IP telephone terminal 1 in the embodiment of the present invention when a PSTN call is received.
FIG. 5 is a flowchart for explaining details of a processing procedure of step S18 (telephone number re-transmission processing) in FIG. 4;
FIG. 6 is a diagram showing an example of a packet at the time of outgoing call from an IP telephone.
FIG. 7 is a flowchart for explaining a processing procedure of IP telephone terminal 1 in the embodiment of the present invention when there is an incoming call from the IP telephone.
[Explanation of symbols]
1 IP telephone terminal, 2, 3 telephone, 4 LAN, 5 PC, 6 GW, 7 Internet, 8 public switched network, 11, 12 TEL IF, 13 LAN IF, 14 PSTN IF, 15 DSL IF, 16 DSP, 17 CODEC , 18, 19 SLIC, 20 call detection / loop circuit, 21 hook detection circuit, 22, 23 switch A, 24, 25 switch B, 26 storage unit, 27, 28 PHY unit, 29 control unit.

Claims (1)

An IP telephone terminal to which a plurality of telephones are connected and which connects the plurality of telephones to an IP telephone network and a public switched telephone network,
Receiving means for receiving a packet at the time of outgoing call via the IP telephone network and extracting the outgoing telephone number of the telephone of the other party included in the packet;
An information communication terminal activation signal is transmitted to the plurality of telephones, the calling telephone number is transmitted as a modem signal to a telephone that has received a primary response, and a calling signal is transmitted to a telephone that has transmitted a reception completion signal. Control means for
Said plurality of telephones, without going through the reception means and said control means further seen including a plurality of switches that can be connected to the public telephone network,
When there is an incoming call through the public switched telephone network, the control means switches the plurality of switches to receive a modem signal through the public switched telephone network, and receives the other party's telephone set included in the modem signal. An IP telephone terminal that extracts a calling telephone number and transmits the calling telephone number as a modem signal to the telephone that has made the primary response .

Images