JP2016086361A - Telephone system and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a telephone system, already compatible with intra-network communication for an extension network, compatible with inter-network communication at low cost.SOLUTION: An ISDN-GW 11 in the telephone system receives a transmission signal from a telephone terminal 7-11 accommodated in a main unit 2-10 to a telephone terminal 7-21 accommodated in a main unit 2-20; and by referring to a GW table 11a, converts the external number of the telephone terminal 7-11, which is an originating number in a call originating signal to an extension number; and by referring to the GW table 11a, converts the extension number of the telephone terminal 7-21, which is an incoming number in the call originating signal to an external number; and transfers the call originating signal in which the originating number and the incoming number are converted respectively, to the main unit 2-20 in which the telephone terminal 7-21 is accommodated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a telephone system and a communication method.

  PBX (Private Branch eXchange), which accommodates existing telephone networks such as Public Switched Telephone Network (PSTN) and ISDN (Integrated Services Digital Network) network, is IP (Internet over IP) using VoIP (Voice Over Internet Protocol) technology. Attempts have been made to support Protocol.

In Patent Document 1, when a voice call is made by connecting an extension constructed in a predetermined area and an external communication network, an IP associated with a telephone number from a database based on a telephone number of a communication destination is disclosed. There is described a private branch exchange that acquires an address and transmits / receives packet data to / from a communication destination specified by the acquired IP address.
In Patent Document 2, when a terminal connected to a telephone network makes a call to an IP terminal, the exchange connects to the gateway from the IP telephone number, and the gateway makes the SIP (Session Initiation Protocol) server refer to the registered contents. A system for authentication is described.

Patent Document 3 uses an SIP technology for a dedicated line interconnection procedure between IP-PBXs of a plurality of local systems, and designs an extension number plan that takes into consideration that extension numbers accommodated in each IP-PBX do not overlap. The system to be described is described.
In Patent Document 4, a call control system provided in a second telephone network in a telephone network in which a first telephone network and a second telephone network are connected via a gateway device is connected to the first telephone network. It is described that the telephone number and extension number for the second telephone network are assigned to the telephone terminal.

JP 2003-143323 A JP 2004-336663 A JP 2008-236241 A JP 2010-183199 A

  There is a need to perform an inter-network communication by connecting an extension network operated under a certain management in a company or the like to a network under a different management. Usually, inter-network communication is performed using an external number that can be transmitted and received from the outside as a called number instead of a unique extension number in the network. However, as with intra-network communication, it is desirable to use an extension number as a called number in inter-network communication.

  Furthermore, since the technique of Patent Document 3 is a method of taking in the information of the telephone number of another company into the IP-PBX of a certain company, the PBX corresponding to intra-network communication is transferred to the IP-PBX for inter-network communication. It will be necessary to replace it, and the introduction cost will be increased.

  Therefore, an object of the present invention is to make a telephone system already compatible with in-network communication of an extension network compatible with inter-network communication at low cost.

In order to solve the above-described problems, the telephone system of the present invention is connected to a plurality of main apparatuses, and the correspondence information between the extension numbers and the external line numbers of the telephone terminals accommodated in each of the main apparatuses is managed in an extension table. Configured to include an extension gateway,
The extension gateway is
Receiving a first outgoing signal from a first telephone terminal accommodated in the first main apparatus to a second telephone terminal accommodated in the second main apparatus;
With reference to the extension table, the external number of the first telephone terminal, which is the calling number of the first outgoing signal, is converted into an extension number,
With reference to the extension table, the extension number of the second telephone terminal, which is the called number of the first outgoing signal, is converted to an outside line number,
The first outgoing signal, in which the calling number and called number are converted, is transferred to the second main device which is the accommodation destination of the second telephone terminal.
Other means will be described in the embodiment for carrying out the invention.

  According to the present invention, a telephone system that is already compatible with in-network communication of an extension network can be made compatible with inter-network communication at low cost.

It is a block diagram which shows the telephone system regarding one Embodiment of this invention. It is a block diagram which shows each table memorize | stored in the telephone system regarding one Embodiment of this invention. It is a sequence diagram which shows the transmission process between the telephone terminals of the extension regarding one Embodiment of this invention. It is a sequence diagram which shows the transmission process from the telephone terminal of the extension line to the IP terminal of LAN regarding one Embodiment of this invention. It is a sequence diagram which shows the transmission process from the IP terminal of LAN regarding the one Embodiment of this invention to the telephone terminal of an extension. It is a sequence diagram which shows the transmission process from the telephone terminal of the extension line to the telephone terminal of WAN regarding one Embodiment of this invention. It is a sequence diagram which shows the transmission process from the telephone terminal of WAN regarding the one Embodiment of this invention to the telephone terminal of an extension.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a telephone system. The code “2-10” of the main apparatus 2-10 is obtained by connecting “2” indicating the apparatus type and “10” indicating the telephone number of the apparatus with a hyphen (−). Hereinafter, similarly, a code in which a device type and a telephone number are connected with a hyphen is appropriately used.
For example, a transmission signal from the telephone terminal 7-11 to the telephone terminal 7-12 includes a calling number “11” and a called number “12”.

The telephone system is configured such that the IP-PBX 1 connects the following networks (network 1) to (network 3).
(Network 1: Extension network) is a network that connects the ISDN-GW (Gateway) 11 of the IP-PBX 1, the main device 2, the TA (Terminal Adapter) 3, and the telephone terminal 7. The main device 2 is a device connected to the ISDN network, and the device is connected to the IP-PBX 1 as it is.
(Network 2: LAN: Local Area Network) is a network that connects the PBX-SIPSV (Session Initiation Protocol Server) 12 of the IP-PBX 1 and the IP terminal 5.
(Network 3: outside line network) is a network that connects ITSP (Internet Telephony Service Provider) -GW 13 of IP-PBX 1, WAN (Wide Area Network) 8, and telephone 9.
Each device of the telephone system such as the IP-PBX 1 is configured as a computer having a CPU (Central Processing Unit), a memory, a hard disk (storage means), and a network interface, and this computer stores a program read into the memory by the CPU. By executing, each processing unit is operated.

For (network 1: extension network), the main device 2-10 accommodates a telephone terminal 7-11 and a telephone terminal 7-12. The main device 2-10 relays a transmission signal from the telephone terminal 7-11 to the telephone terminal 7-12 and a response signal (ACK) from the telephone terminal 7-12 to the telephone terminal 7-11 in the opposite direction. By doing so, the telephone call between the telephone terminal 7-11 and the telephone terminal 7-12 is made possible. Similarly, the main device 2-20 relays a transmission signal from the telephone terminal 7-21 to the telephone terminal 7-22 and a response signal thereof, so that the telephone terminal 7-21 and the telephone terminal 7-22 can communicate with each other. Allows calls between.
The details will be described later in the GW table 11a of FIG. 2, but a telephone number is assigned to each device in accordance with the following telephone number assignment plan.
Each main device 2 has an external line number used for connection with the IP-PBX 1 (“03110” for the main device 2-10) and an extension number used for communication within the extension network (“10” for the main device 2-10). And are assigned respectively.
Each telephone terminal 7 is assigned an extension number (“11” for the telephone terminal 7-11). When connecting to the IP-PBX 1 via TA3, an external line number (telephone terminal 7-31) is further added. "03331") is also assigned.

Therefore, for reasons such as in the same company (under the same management system), a call between the telephone terminals 7 accommodated in the same main device 2 is possible without going through the IP-PBX 1. On the other hand, a call between the telephone terminals 7 accommodated in different main apparatuses 2 such as a call between the telephone terminals 7-11 and 7-21 needs to be via the IP-PBX 1 (for details, see FIG. 3). .
The IP-PBX 1 aggregates a plurality of main devices 2 and enables an extension call between the telephone terminals 7 across the main device 2-10 managed by a certain company and the main device 2-20 managed by another company. To do.

Here, the main apparatus 2-30 and the main apparatus 2-40 are relaying TA3 in the middle of connection with ISDN-GW11. This TA3 plays the role of an adapter for connecting the main device 2-30 having an analog interface and the main device 2-40 to the ISDN-GW 11 having a digital interface. That is, the main apparatus 2-30 and TA3 are connected by an analog line, and TA3 and ISDN-GW11 are connected by an ISDN line. On the other hand, since the main device 2-10 and the main device 2-20 each have a digital interface, they are directly connected to the ISDN-GW 11 via the ISDN line without going through the TA3.
It should be noted that TA3 is not a separate device from IP-PBX1, but IP-PBX1 incorporates the function of TA3, and main device 2-30 and main device 2-40 having analog interfaces are connected to IP-PBX1. You may connect directly.

The analog interface is an interface for connecting each telephone terminal 7 to the public switched telephone network (PSTN).
The digital interface is an interface for connecting each telephone terminal 7 to the ISDN network.

  As for (network 2: LAN), as illustrated in FIG. 1, the IP terminal 5 is configured as a tablet terminal capable of VoIP. The communication between the IP terminals 5 and the communication between the IP-PBX 1 and the IP terminal 5 are respectively wireless communication such as Wi-Fi (Wireless Fidelity) (registered trademark) standard, Ethernet (registered trademark) standard, etc. Wired communication is possible. Although not shown, a relay device such as a wireless router may be provided between the IP-PBX 1 and the IP terminal 5.

In FIG. 1, the IP terminal 5 is exemplified by a terminal L5-50, a terminal L5-51, and a terminal L5-52. Among these, the terminal L5-50 is a reception terminal (hereinafter referred to as a reception terminal). The reception terminal L5-50 is installed at, for example, a company reception and is operated by a user such as a receptionist. The reception terminal L5-50 is used for a purpose such as calling the employee terminal L5-51 or the employee terminal L5-52 operated by an employee who has business with the customer when the receptionist receives the visitor. Note that names such as “reception” and “employee” are illustrated for easy understanding of the explanation, and the user of each terminal is not limited to these persons.
In the telephone system of FIG. 1, even when a plurality of (network 1: extension network) are accommodated, an integrated reception telephone can be installed by preparing one reception terminal L5-50. Therefore, the cost can be reduced by consolidating the reception work of a plurality of companies in one place.
Here, the reception terminal L5-50 may be implemented, for example, as an IP telephone for reception telephones, or as a reception tablet terminal similar to the terminal L5-51, and deployed in the tablet terminal. It may be implemented as an IP phone application.
Moreover, it is desirable that the reception terminal L5-50 is a terminal dedicated to transmission for the convenience of reception work.

As for (network 3: external network), WAN 8 is a telephone network connected to the Internet, for example, and telephone 9 is connected to WAN 8. The main difference between the telephone terminal 7 and the telephone 9 is that the assigned telephone number is an extension number of the telephone terminal 7 or an external line number of the telephone 9.
As will be described later in FIG. 2, the IP-PBX 1 manages the telephone numbers of the terminals (main device 2 and IP terminal 5) accommodated in the connected (network 1) and (network 2). The telephone number of the telephone set 9 accommodated in the connected (network 3) is not managed. Thereby, the load of IP-PBX1 can be reduced by reducing the range (number of terminals accommodated) which IP-PBX1 takes charge of.

Each processing unit of the IP-PBX 1 includes one or more ports that are communication interfaces with the outside.
The port L1 of the ISDN-GW 11 is used for intra-device communication of the IP-PBX 1 (communication with the PBX-SIPSV 12 and communication with the ITSP-GW 13).
The internal port L2 of the PBX-SIPSV 12 is used for in-device communication of the IP-PBX 1 (communication with ISDN-GW 11 and communication with ITSP-GW 13). Furthermore, the PBX-SIPSV 12 has an external port for communicating with each IP terminal 5 of (network 2: LAN).
The port W 1 of the ITSP-GW 13 is connected to the WAN 8 and is used for communication with the telephone set 9.
The port L3 of the ITSP-GW 13 is used for in-device communication of the IP-PBX 1 (communication with the ISDN-GW 11 and communication with the PBX-SIPSV 12).
In addition, in FIG. 1, the configuration in which three processing units (ISDN-GW11, PBX-SIPSV12, and ITSP-GW13) are provided inside a single IP-PBX1 device is illustrated, but the three processing units are different devices. (That is, three devices connected to each other play a role of IP-PBX1).

FIG. 2 is a configuration diagram showing each table stored in the telephone system.
The GW table 11a stored in the ISDN-GW 11 is a table for managing the telephone numbers of the respective telephone terminals 7 accommodated in the IP-PBX 1 (network 1: extension network). This GW table 11a is a correspondence table between the extension number assigned to each main apparatus 2 or each telephone terminal 7 and the external line number when the extension number is accessed from the ISDN-GW 11.
For example, the ISDN-GW 11 that has received the transmission signal having the calling number “03110 * 11” refers to the GW table 11 a and converts the calling number to the corresponding extension number “11”.
Further, the ISDN-GW 11 that has received the SIP INVITE with the called number “21” refers to the GW table 11 a and converts the called number into the corresponding “03220 * 21”.

A number whose first digit is “0”, such as an extension number “10”, is a number used for simultaneous calling to each telephone terminal 7 accommodated in the main device 2 of the extension number. For example, the main device 2-10 that has received the outgoing signal of the called number “10” makes a simultaneous call to the telephone terminals 7-11 and 7-12 accommodated therein. When the telephone terminal 7-11 receives an incoming call (off-hook), the main device 2-10 stops calling the remaining telephone terminals 7-12.
A number whose first digit is not “0”, such as the extension number “11”, is a number used for a single call to the telephone terminal 7 of the extension number.

The external line number “03110 * 11” is a combination of the main number “03110” of the main device 2 and the sub-number “11” of the telephone terminal 7 accommodated in the main device 2. Thus, the external line number including the sub-number is given to the telephone terminal 7 accommodated in the main apparatus 2 that can be directly connected to the IP-PBX 1 such as the main apparatus 2-10 and the main apparatus 2-20 via the ISDN line. Assigned.
On the other hand, the outside line number “03331” is a number (analog dial-in) that uniquely identifies the telephone terminal 7-31. As described above, the external line number not including the sub-number is assigned to the telephone terminal 7 accommodated in the main apparatus 2 that is connected to the IP-PBX 1 via the TA 3 such as the main apparatus 2-30 and the main apparatus 2-40. It has been.

The register table 12a stored in the PBX-SIPSV 12 is a table that associates the telephone number of each telephone terminal 7 accommodated in the IP-PBX 1 (network 1: extension network) with a port (LAN-IP) as a transfer destination. is there. The register table 12a is a table that associates the telephone number of each IP terminal 5 of (network 2: LAN) with the IP address of the port that the IP terminal 5 has.
The PBX-SIPSV 12 receives a registration request (SIP Register signal) for each entry in the GW table 11a from the ISDN-GW 11, and associates each requested extension number with the port L1 of the requesting ISDN-GW 11 to create a GW. Write to table 11a.

The PBX-SIPSV 12 receives a registration request for its own entry from each IP terminal 5 and receives the requested IP terminal 5 number and the IP address (L5-50, L5-51) of the port of the requesting IP terminal 5. , L5-52) are written in the register table 12a. Note that, as the LAN-IP to be written out, the IP address of the relay device directed to the IP terminal 5 may be used instead of the IP address of the requesting IP terminal 5.
Furthermore, if the register table 12a does not correspond to any entry in the registered register table 12a as an entry to be transferred to (network 3: external network) (phone number = others), the port L3 of the ITSP-GW 13 is set. Let it be LAN-IP.

The external line transmission table 13a stored in the PBX-SIPSV 12 is a telephone number (extension number) of each main device 2, each telephone terminal 7, and each IP terminal 5, and when accessing the extension number from the WAN 8 It is a correspondence table with the external line number allocated to the port W1.
For example, the ITSP-GW 13 that has received the transmission signal of the calling number “11” refers to the outside line transmission table 13a, rewrites the calling number to “03110”, and then transfers it to the WAN 8.

The external line incoming table 13b stored in the PBX-SIPSV 12 is obtained when the ITSP-GW 13 receives an external line number assigned to the port W1 when accessing the port W1 from the WAN 8 and a call signal having the external line number as a called number. FIG. 5 is a correspondence table with the extension number of the main apparatus 2 which is a transfer destination of the transmission signal.
For example, the ITSP-GW 13 that has received the outgoing signal of the called number “03220” refers to the outside line incoming call table 13b, rewrites the called number to “20”, and then transfers it to the main device 2-20.
In addition, the ITSP-GW 13 that has received the outgoing signal with the called number “03550” has received the first outgoing signal with the called number of the received outgoing signal rewritten to “51” with reference to the outside line incoming call table 13b. A second outgoing signal is generated by rewriting the incoming number of the outgoing signal to “52” and transferred to the corresponding IP terminal 5.
Note that the called number “50” is a reception terminal, and usually does not require incoming call processing. Therefore, even if the generation of the third outgoing signal by rewriting the called number of the received outgoing signal to “50” is omitted. It is also possible to create and transfer without omission.

The external line transmission table 13a and the external line reception table 13b each suppress one-line extension number (or group of extension numbers) by associating one external line number with each other, thereby suppressing the occurrence of crosstalk between different companies. Can do.
In other words, by assigning a plurality of (for each main device 2) external line numbers to one IP-PBX1 (one port W1), the IP-PBX1 is logically divided, as if there are a plurality (for each company). It can be accessed from the WAN 8 as if the IP-PBX 1 exists.

Hereinafter, the operation of the telephone system such as the IP-PBX 1 will be clarified with reference to each sequence diagram of FIG. 3 and subsequent figures.
FIG. 3 shows the transmission processing of the first transmission signal of (network 1: extension network) → (network 1: extension network).
FIG. 4 shows a transmission process of the second transmission signal of (network 1: extension network) → (network 2: LAN).
FIG. 5 shows a transmission process of the third transmission signal of (network 2: LAN) → (network 1: extension network).
FIG. 6 shows a transmission process of the fourth transmission signal of (network 1: internal network) → (network 3: external network).
FIG. 7 shows a transmission process of the fifth transmission signal of (network 3: external network) → (network 1: internal network).
In each sequence diagram, the following notation is used.
A solid line arrow is used for communication of a telephone call signal (analog signal or ISDN signal). A dashed arrow is used for SIP INVITE communication.
A combination of the calling number (From) and the called number (To) included in the outgoing signal is expressed in a “From → To” format. “Transmission signal (11 → 03220 * 21)” indicates a transmission signal of a telephone having a calling number (From) of “11” and a called number (To) of “03220 * 21”. Similarly, “SIP INVITE (11 → 21)” indicates a SIP INVITE in which the calling number (From) is “11” and the called number (To) is “21”.

FIG. 3 is a sequence diagram showing call processing between extension telephone terminals (telephone terminal 7-11 → phone terminal 7-21).
As S101, the telephone terminal 7-11 accepts the call request by the caller's operation such that the handset is off-hook and the called number is input. Here, the extension number “21” of the telephone terminal 7-21 is designated as the called number (To).
In S102, the telephone terminal 7-11 transmits a transmission signal (→ 21) with the called number (To) received in S101 to the main apparatus 2-10 that is the accommodation destination.
As S103, when the main apparatus 2-10 receives the outgoing signal of S102 from the port connected to the telephone terminal 7-11, the main apparatus 2-10 identifies the outgoing number (From) of the outgoing signal as the number of the telephone terminal 7-11. Then, “03110 * 11”, which is the external line number of the telephone terminal 7-11, is added as a calling signal calling number (From).

As S104, the main apparatus 2-10 does not accommodate the extension number “21” of the telephone terminal 7-21, and transmits the outgoing signal (03110 * 11 → 21) of S103 to the ISDN-GW11.
In S105, the ISDN-GW 11 refers to the GW table 11a and converts the outside line number “03110 * 11” of the calling number (From) attached to the outgoing signal in S104 into the corresponding extension number “11”.
As S106, ISDN-GW11 converts the transmission signal (11 → 21) of S105 into SIP INVITE (11 → 21), and transmits the SIP INVITE to PBX-SIPSV12.

In S107, the PBX-SIPSV 12 refers to the register table 12a and searches for the address of the port L1 of the ISDN-GW 11 as the transfer destination LAN-IP from (To: 21) of the SIP INVITE (11 → 21) in S106. To do.
As S108, the PBX-SIPSV 12 transmits the SIP INVITE (11 → 21) of S107 to the searched ISDN-GW 11.
As S109, the ISDN-GW 11 converts the called number (To) from “21” to “03220 * 21” with reference to the GW table 11a for the SIP INVITE (11 → 21) of S108.

In S111, the ISDN-GW 11 converts the SIP INVITE (11 → 03220 * 21) in S109 into a telephone call signal, and the converted telephone call signal is sent to the main device 2-20 (main device 2 corresponding to the number 03220). ).
In S112, the main apparatus 2-20 recognizes that the call is a single call to the telephone terminal 7-21 from the sub-number “21” of the called number (To) in S111, and is connected to the telephone terminal 7-21. Identify the ports that are present.
On the other hand, although different from the example of FIG. 3, the sub number is not attached to the outgoing signal to the telephone terminal 7-31 accommodated in the main device 2-30. In such a case, as described in the GW table 11a, the corresponding extension number (31) may be uniquely specified from the outside line number (03331) of the received transmission signal.

As S113, the main apparatus 2-20 transmits the transmission signal (11 → 21) of S112 to the telephone terminal 7-21 via the specified port.
As S114, when the telephone terminal 7-21 receives the outgoing signal of S113, the telephone terminal 7-21 sounds a ringtone. When the callee off-hooks the telephone terminal 7-21, a response signal to the outgoing signal is returned from the telephone terminal 7-12 to the telephone terminal 7-11, so that the telephone terminals 7 accommodated in different main devices 2 You can make an extension call. Here, the telephone terminal 7-21 gives the calling number “11” of the outgoing signal (11 → 21) in S113 (or the extension number “10” of the main device 2-10 that accommodates the calling number “11”), By displaying on a display unit such as a liquid crystal display (calling number display process), it is possible to inform the recipient of who the incoming call is.

FIG. 4 is a sequence diagram showing a calling process from the extension telephone terminal to the LAN IP terminal.
First, S201 to S206, which are the processes on the transmission side in the first half (telephone terminal 7-11 → main device 2-10 → ISDN-GW11 → PBX-SIPSV12), are the same processing contents as S101 to S106 in FIG. The called number (To) may be read from “21” in FIG. 3 to “51” in FIG.

As S207, the PBX-SIPSV 12 refers to the register table 12a, and goes from (To: 51) of the SIP INVITE (11 → 51) of S206 to the IP terminal that goes to (network 2: LAN) as the transfer destination LAN-IP The 5-51 address (L5-51) is searched.
As S211, the PBX-SIPSV 12 transmits the SIP INVITE (11 → 51) of S207 to the IP terminal 5-51 via the searched port L5-51.
As S212, upon receiving the SIP INVITE of S211, the IP terminal 5-51 rings a ringtone. Similarly to S114, an extension call can be made between the telephone terminal 7-11 and the IP terminal 5-51 by the off-hook of the callee and the reply of the response signal. Here, the IP terminal 5-51 may perform the display process of the calling party number “11” as in S114.

FIG. 5 is a sequence diagram showing a calling process from a LAN IP terminal to an extension telephone terminal.
As S231, the IP terminal 5-51 receives a call request by an operation of a caller such as an operation of starting a call application and an operation of selecting a callee from the address book. Here, the extension number “11” of the telephone terminal 7-11 is designated as the called number (To).
As S232, the IP terminal 5-51 stores the SIP INVITE (51 → 11) including the calling party number (From) indicating the IP terminal 5-51 in S231 and the called party number (To) specified in S231. Is transmitted to PBX-SIPSV12 of IP-PBX1.

As S233, as in S107, the PBX-SIPSV 12 refers to the register table 12a, and from the SIP INVITE (51 → 11) (To: 11) of S232, the port of the ISDN-GW 11 as the transfer destination LAN-IP The address of L1 is searched.
In S234, as in S108, the PBX-SIPSV 12 transmits the SIP INVITE (51 → 11) of S233 to the searched ISDN-GW 11.
As S235, as in S109, the ISDN-GW 11 converts the called number (To) from “11” to “03110 * 11” with reference to the GW table 11a for the SIP INVITE (51 → 11) of S108. .
S241 to S244, which are the processing of the latter half of the calling side (ISDN-GW11 → main device 2-10 → telephone terminal 7-11), are the same processing contents as S111 to S114 of FIG. 3, respectively (From → To) 4 (11 → 21) in FIG. 4 may be read as (51 → 11) in FIG.

In addition, the transmission process from the reception terminal L5-50 to the employee terminal L5-51 is performed as in the following (Procedure 1) to (Procedure 5).
(Procedure 1) The reception terminal L5-50 receives a transmission request in which the extension number “51” of the employee terminal L5-51 is designated as the called number (To), similarly to S231.
(Procedure 2) Similarly to S232, the reception terminal L5-50 includes a SIP INVITE (50) including the calling number (From) indicating the reception terminal L5-50 and the called number (To) specified in (Procedure 1). → 51) is transmitted to PBX-SIPSV12 of IP-PBX1 which is the accommodation destination.
(Procedure 3) Similarly to S233, the PBX-SIPSV 12 refers to the register table 12a, and from (To: 51) in (Procedure 2), the port L5- of the employee terminal L5-51 as the transfer destination LAN-IP. Search for 51 addresses.
(Procedure 4) The PBX-SIPSV 12 transfers the SIP INVITE (50 → 51) received in (Procedure 2) to the port L5-51 searched in (Procedure 3).
(Procedure 5) As with S244, the employee terminal L5-51 rings a ring tone based on the SIP INVITE (50 → 51) transferred in (Procedure 4).

  The transmission processing between the terminals (IP terminal 5 and telephone terminal 7) accommodated in IP-PBX 1 has been described above with reference to FIGS. Since the outside line sending means (ITSP-GW 13, outside line sending table 13a, outside line receiving table 13b) is not used for sending processing between these terminals accommodated, if outside line sending is not used, the outside line sending from IP-PBX1 Means may be omitted.

FIG. 6 is a sequence diagram showing a calling process from the extension telephone terminal to the WAN telephone terminal.
First, S301 to S306, which are processing on the first half (telephone terminal 7-11 → main device 2-10 → ISDN-GW11 → PBX-SIPSV12), are the same as S101 to S106 in FIG. The called number (To) may be read from “21” in FIG. 3 to “91” in FIG.

As S307, the PBX-SIPSV 12 refers to the register table 12a and searches for the telephone number of (To: 91) in the SIP INVITE (11 → 91) in S306. However, since it does not correspond to any of the telephone numbers (10, 11, 12,..., 51, 52) in the register table 12a (in other words, because it is a telephone number of a terminal not accommodated by the IP-PBX 1), “Other” The address of the port L3 of the ITSP-GW 13 is retrieved as the LAN-IP of the transfer destination.
As S308, the PBX-SIPSV 12 refers to the outside line transmission table 13a and converts the calling number (From) of the SIP INVITE in S306 from the extension number “11” to the outside line number “03110”.

As S311, the PBX-SIPSV 12 transmits the SIP INVITE (03110 → 91) of S308 to the ITSP-GW 13 searched in S307.
As S312, the ITSP-GW 13 corresponds to the format for each rule of the carrier (communication carrier) with which the telephone 9-91 having the called number (To) in S311 is contracted. Corresponding to the format means, for example, using a protocol or address system specified by the carrier.

As S313, the ITSP-GW 13 transmits the SIP INVITE (03110 → 91) of S312 to the telephone 9-91 via the WAN 8.
As S314, upon receiving the SIP INVITE of S313, the telephone set 9-91 sounds a ringtone. Similar to S114, a call can be made between the telephone terminal 7-11 and the telephone 9-91 by the off-hook of the callee and the reply of the response signal. Note that the telephone set 9-91 may perform display processing of the calling party number “03110” as in S114.
Here, when the telephone 9 handles only one carrier, or when a plurality of carriers use the same rule, the ITSP-GW 13 is omitted and the PBX-SIPSV 12 directly passes through the WAN 8 to the telephone 9-91 directly to S308. SIP INVITE (03110 → 91) may be transmitted (that is, S311 to S313 are replaced with one transmission).

FIG. 7 is a sequence diagram showing a calling process from a WAN telephone terminal to an extension telephone terminal.
As S331, the telephone set 9-91 accepts the call request by the caller's operation such that the handset is off-hook and the called number is input. Here, in order to make a simultaneous call to each telephone terminal 7 accommodated in the main device 2-10, the external line number “03110” assigned to the port W1 is designated as the called number (To).
As S332, the telephone 9-91 has a port W1 with a SIP INVITE (91 → 03110) including the calling number (From) indicating the telephone 9-91 of S331 and the called number (To) specified in S331. Transmit to ITSP-GW13.

As S333, the ITSP-GW 13 performs format correspondence for each carrier rule with respect to the SIP INVITE (91 → 03110) of S332, similarly to S312.
As S334, the ITSP-GW 13 transmits the SIP INVITE (91 → 03110) of S333 to the PBX-SIPSV 12.
In S335, the PBX-SIPSV 12 refers to the outside line incoming call table 13b and converts the SIP INVITE destination number (To) in S334 from the outside line number “03110” to the extension number “10”, thereby obtaining the SIP INVITE (91 → 10).

In the following, S336 to S344a and S344b, which are the processing of the latter half (PBX-SIPSV12 → ITSP-GW13 → main device 2-10 → phone terminal 7-11), are substantially the same as S107 to S114 in FIG. 4 (11 → 21) in FIG. 4 that is (From → To) may be read as (91 → 10) in FIG.
Here, in S112, it is a single call to the telephone terminal 7-21 (To: 21), whereas in S342 to S344a and S344b, the telephone terminal 7 via the main device 2-10 (To: 03110). -11 and the telephone terminal 7-12 are different in that they are simultaneous calls (ringing of ringtones). When the called number (To) is “03110” indicating itself, the main apparatus 2-10 calls all the telephone terminals 7 accommodated by itself.

In the present embodiment described above, the following effects can be obtained by the IP-PBX 1 relaying three types of networks: the extension network, the LAN, and the outside network.
In the transmission processing between the extension networks (FIG. 3), the existing main device 2 that accommodates each telephone terminal 7 does not have information managed by the other main device 2 (that is, the existing main device 2). ), The call processing between the different main devices 2 can be realized only by specifying the extension number (without dialing the outside line number).
Therefore, it is possible to easily realize extension calls between different companies (under different management systems) without incurring the cost of replacing the existing main device 2.

  In the transmission processing between the extension network and the LAN (FIGS. 4 and 5), the PBX-SIPSV 12 refers to the register table 12a to determine whether the SIP INVITE transfer destination is the extension network or the LAN. As a result, the SIP server standard implementation can be used as it is and outgoing processing across the extension network and LAN can be performed, so network communication can be achieved at a lower cost than when two different networks use different communication protocols. can do.

Furthermore, after registering both the entry of the telephone terminal 7 and the entry of the IP terminal 5 in the register table 12a of the PBX-SIPSV 12, the transmission between the extension network and the LAN is also performed in the transmission processing between the extension networks. The same PBX-SIPSV 12 is also used for processing. Thereby, when managing the entry of the terminal accommodated by the IP-PBX 1, the integrated register table 12a may be handled, so that the management cost can be reduced.
Therefore, the IP-PBX 1 relays the IP network (network 2: LAN) so that it can be connected to the IP network while utilizing the existing equipment that is not IP (network 1: extension network) as it is. Can be introduced in stages.

In the calling process between the extension network and the outside network (FIGS. 6 and 7), an ITSP-GW 13 is newly provided as a communication window with the telephone set 9 via the WAN 8. As shown in the outside line transmission table 13a and the outside line reception table 13b, an outside line number for each company is assigned to the port W1 of the ITSP-GW 13, so that access to one company is access to another company. Crossing can be prevented, and the number of installed IP-PBXs can be reduced.
Therefore, the IP-PBX 1 relays so that it can be connected to the IP-enabled WAN 8 while using the existing equipment that is not IP-enabled (network 1: extension network) as it is, thus reducing call costs between terminals. it can.

1 IP-PBX
11 ISDN-GW (gateway for extension)
11a GW table (extension table)
12 PBX-SIPSV (IP telephone exchange means)
12a register table 13 ITSP-GW (gateway for outside line)
13a External line outgoing table 13b External line incoming table 2 Main unit 3 TA
5 IP terminal 7 Telephone terminal 8 WAN
9 Telephone

Claims (13)

It is connected to a plurality of main units, and includes an extension gateway that manages correspondence information between extension numbers and external line numbers of telephone terminals accommodated in each main unit in an extension table,
The extension gateway is
Receiving a first outgoing signal from a first telephone terminal accommodated in the first main apparatus to a second telephone terminal accommodated in the second main apparatus;
With reference to the extension table, the external number of the first telephone terminal, which is the calling number of the first outgoing signal, is converted into an extension number,
With reference to the extension table, the extension number of the second telephone terminal, which is the called number of the first outgoing signal, is converted to an outside line number,
The telephone system, wherein the first outgoing signal in which the calling number and the called number are respectively converted is transferred to the second main apparatus which is the accommodation destination of the second telephone terminal. The telephone system further includes IP telephone exchange means for managing the extension number of the telephone terminal accommodated in each main apparatus and the telephone number of the IP terminal connected via the LAN in a register table as different transfer destinations. Have
The extension gateway is
Receiving a second outgoing signal from the telephone terminal accommodated in the main device to the IP terminal;
Referring to the extension table, the external number of the telephone terminal, which is the calling number of the second outgoing signal, is converted into an extension number, and the second outgoing signal with the calling number converted is transferred to the IP telephone exchange means. Forward,
The IP telephone exchange means
The destination number of the transferred second outgoing signal is searched from the register table, the transfer destination of the called number is specified as the port of the IP terminal, and the second outgoing signal is transmitted via the specified port. The telephone system according to claim 1, wherein the telephone system is transferred to the IP terminal. The telephone system further includes IP telephone exchange means for managing the extension number of the telephone terminal accommodated in each main apparatus and the telephone number of the IP terminal connected via the LAN in a register table as different transfer destinations. Have
The IP telephone exchange means
Receiving a third outgoing signal from the IP terminal to the telephone terminal accommodated in the main device;
The destination number of the transferred third outgoing signal is searched from the register table, the transfer destination of the called number is specified as the extension gateway, and the third outgoing signal is sent to the specified extension gateway. Forward,
The extension gateway is
With reference to the extension table, the extension number of the telephone terminal, which is the called party number of the transferred third outgoing signal, is converted from the extension number of the telephone terminal, and the third outgoing signal with the called party number converted is converted into the telephone number. The telephone system according to claim 1, wherein the telephone system is transferred to the main apparatus which is a terminal accommodation destination. The IP telephone exchange means further groups, for each main apparatus, the extension number of the main apparatus and the extension number of each telephone terminal accommodated in the main apparatus into one external line number. We have an outside line transmission table to associate,
The telephone system further includes an external line gateway having a connection port with an external network to which an external line number of the external line transmission table is assigned.
The extension gateway is
Receiving a fourth outgoing signal from the telephone terminal accommodated in the main device to a telephone in an external network;
With reference to the extension table, the external number of the telephone terminal, which is the calling number of the fourth outgoing signal, is converted into an extension number, and the converted fourth outgoing signal is transferred to the IP telephone exchange means,
The IP telephone exchange means
Since the called party number of the transferred fourth outgoing signal has not been searched from the register table, the destination of the called party number is identified as the gateway for the outside line,
Referring to the external line transmission table, the extension number of the telephone terminal, which is the calling number of the fourth transmission signal, is converted to the external line number assigned to the connection port with the external network, and the calling number is converted. 4. The telephone system according to claim 2, wherein the transmitted fourth outgoing signal is transferred to the telephone of the external network via the connection port of the external line gateway. 5. The IP telephone exchange means further includes an outside line incoming table that associates the extension number of the main unit with the outside line number,
The register table further manages the extension number of the main device,
The telephone system further includes an external line gateway having a connection port with an external network to which an external line number of the external line incoming table is assigned.
The IP telephone exchange means
Via the connection port of the external line gateway, receiving a fifth outgoing signal from a telephone on the external network to the main unit;
With reference to the external line incoming table, the external line number assigned to the connection port that is the destination number of the fifth transmission signal is converted into the extension number of the main unit,
The converted destination number of the transferred fifth outgoing signal is searched from the register table to identify the transfer destination of the called number as the extension gateway, and the fifth outgoing call is specified to the specified extension gateway. Transfer signal,
The extension gateway is
Referring to the extension table, the extension number of the main apparatus, which is the called party number of the transferred fifth transmission signal, is converted from the extension number to the outside line number. The telephone system according to claim 2, wherein the telephone system is transferred to a device. 6. The telephone system according to claim 4, wherein the extension gateway, the IP telephone exchange unit, and the outside line gateway are accommodated in separate cases. The telephone system further includes the main devices connected to the extension gateway.
Each of the main devices calls the telephone terminal to be called from the set of telephone terminals accommodated by itself based on the sub-number of the called party number of the first outgoing signal transferred from the extension gateway. The telephone system according to claim 1, wherein the telephone system is specified. The telephone system further includes each TA (Terminal Adapter) connected to the extension gateway, and the main device connected to each TA,
Each of the main devices specifies the telephone terminal to be called from the set of telephone terminals accommodated in itself based on the called party number of the first outgoing signal transferred from the extension gateway. The telephone system according to any one of claims 1 to 5. Communication by a telephone system including an extension gateway that is connected to a plurality of main apparatuses and manages correspondence information between extension numbers and external line numbers of telephone terminals accommodated in the main apparatuses in an extension table. A method,
The extension gateway is
Receiving a first outgoing signal from a first telephone terminal accommodated in the first main apparatus to a second telephone terminal accommodated in the second main apparatus;
With reference to the extension table, the external number of the first telephone terminal, which is the calling number of the first outgoing signal, is converted into an extension number,
With reference to the extension table, the extension number of the second telephone terminal, which is the called number of the first outgoing signal, is converted to an outside line number,
A communication method using a telephone system, wherein the first outgoing signal, in which the calling number and called number are respectively converted, is transferred to the second main device which is the accommodation destination of the second telephone terminal. The telephone system further includes IP telephone exchange means for managing the extension number of the telephone terminal accommodated in each main apparatus and the telephone number of the IP terminal connected via the LAN in a register table as different transfer destinations. Have
The extension gateway is
Receiving a second outgoing signal from the telephone terminal accommodated in the main device to the IP terminal;
Referring to the extension table, the external number of the telephone terminal, which is the calling number of the second outgoing signal, is converted into an extension number, and the second outgoing signal with the calling number converted is transferred to the IP telephone exchange means. Forward,
The IP telephone exchange means
The destination number of the transferred second outgoing signal is searched from the register table, the transfer destination of the called number is specified as the port of the IP terminal, and the second outgoing signal is transmitted via the specified port. 10. The communication method using the telephone system according to claim 9, wherein: is transferred to the IP terminal. The telephone system further includes IP telephone exchange means for managing the extension number of the telephone terminal accommodated in each main apparatus and the telephone number of the IP terminal connected via the LAN in a register table as different transfer destinations. Have
The IP telephone exchange means
Receiving a third outgoing signal from the IP terminal to the telephone terminal accommodated in the main device;
The destination number of the transferred third outgoing signal is searched from the register table, the transfer destination of the called number is specified as the extension gateway, and the third outgoing signal is sent to the specified extension gateway. Forward,
The extension gateway is
With reference to the extension table, the extension number of the telephone terminal, which is the called party number of the transferred third outgoing signal, is converted from the extension number of the telephone terminal, and the third outgoing signal with the called party number converted is converted into the telephone number. The communication method using the telephone system according to claim 9, wherein the transfer is performed to the main apparatus which is a terminal accommodation destination. The IP telephone exchange means further groups, for each main apparatus, the extension number of the main apparatus and the extension number of each telephone terminal accommodated in the main apparatus into one external line number. We have an outside line transmission table to associate,
The telephone system further includes an external line gateway having a connection port with an external network to which an external line number of the external line transmission table is assigned.
The extension gateway is
Receiving a fourth outgoing signal from the telephone terminal accommodated in the main device to a telephone in an external network;
With reference to the extension table, the external number of the telephone terminal, which is the calling number of the fourth outgoing signal, is converted into an extension number, and the converted fourth outgoing signal is transferred to the IP telephone exchange means,
The IP telephone exchange means
Since the called party number of the transferred fourth outgoing signal has not been searched from the register table, the destination of the called party number is identified as the gateway for the outside line,
Referring to the external line transmission table, the extension number of the telephone terminal, which is the calling number of the fourth transmission signal, is converted to the external line number assigned to the connection port with the external network, and the calling number is converted. The communication method using the telephone system according to claim 10 or 11, wherein the transmitted fourth transmission signal is transferred to the telephone of the external network via the connection port of the external line gateway. . The IP telephone exchange means further includes an outside line incoming table that associates the extension number of the main unit with the outside line number,
The register table further manages the extension number of the main device,
The telephone system further includes an external line gateway having a connection port with an external network to which an external line number of the external line incoming table is assigned.
The IP telephone exchange means
Via the connection port of the external line gateway, receiving a fifth outgoing signal from a telephone on the external network to the main unit;
With reference to the external line incoming table, the external line number assigned to the connection port that is the destination number of the fifth transmission signal is converted into the extension number of the main unit,
The converted destination number of the transferred fifth outgoing signal is searched from the register table to identify the transfer destination of the called number as the extension gateway, and the fifth outgoing call is specified to the specified extension gateway. Transfer signal,
The extension gateway is
Referring to the extension table, the extension number of the main apparatus, which is the called party number of the transferred fifth transmission signal, is converted from the extension number to the outside line number. The communication method using the telephone system according to claim 10 or 11, wherein the communication method is transferred to a device.

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