JP6131678B2 - IP telephone switching system - Google Patents

Description

  The present invention relates to an IP telephone exchange system having an area simultaneous call function that allows a plurality of telephone terminals corresponding to a specified special number to be received simultaneously.

  An IP telephone exchange in an IP telephone exchange system manages an IP address assigned to an IP telephone terminal in association with a telephone number, thereby enabling a non-IP telephone through a telephone call between IP telephone terminals using a telephone number or via a gateway. Enables a call with the terminal.

  For example, when calling IP phone terminals on the same floor all at once, it is usually necessary to register the IP address of the IP phone terminal corresponding to the specified special number in advance in the IP phone exchange. When the IP telephone terminal on the calling side designates a special number, the IP telephone exchange can convert the IP address corresponding to the designated special number and call the IP telephone terminals corresponding to the designated special number all at once.

  For example, in Patent Literature 1, when a call area is formed by arranging a base station for each of a plurality of tenants and an incoming tenant number assigned to each of the plurality of tenants is received, the incoming tenant number is handled. A technique for receiving a call to a fixed terminal and a mobile terminal in a tenant is disclosed. Patent Document 2 discloses a technique for performing simultaneous notification processing to a plurality of terminals in the same group.

JP-A-11-98545 JP 2007-166393 A

  However, when using an IP telephone terminal while carrying the IP telephone terminal across different floors in the building, if it is desired to call someone on a specific floor, the telephone number of the IP telephone terminal corresponding to the floor Since the user does not know, there is a problem that IP telephone terminals corresponding to a specific floor cannot be specified and called simultaneously.

  The present invention has been made in view of the above problems, and even if a telephone terminal is carried around different floors in a building, an incoming call accompanied by a designated special number can be handled by the telephone terminal corresponding to the designated special number. An object is to provide an IP telephone exchange system that allows incoming calls all at once.

  The IP telephone exchange system according to the first aspect of the present invention is an IP telephone exchange system provided with an area simultaneous call reception function for receiving an incoming call with designation of a called area to a plurality of telephone terminals belonging to the designated called area. Holding means for holding a correspondence relationship between a predetermined called area and a network address, network address conversion means for converting the designated called area into a network address according to the correspondence relationship, and corresponding to the network address Terminal address extracting means for extracting each of the IP addresses of the telephone terminals belonging to the network as incoming numbers, and telephone terminal receiving means for receiving the incoming calls all at once to the telephone terminals corresponding to the incoming numbers. It is characterized by.

It is a block diagram which shows the structure of the IP telephone switching system which is an Example of this invention. It is a flowchart which shows the called area designation | designated call processing routine which is a function of the Example of FIG. It is a flowchart which shows the subroutine of the designated call area network address corresponding | compatible map change process function which is a function of the Example of FIG. It is a sequence diagram which shows the operation example when the IP telephone terminal in the Example of FIG. 1 moves to a different called area. FIG. 5 is an explanatory diagram showing an extension data map of the IP telephone exchange after the IP telephone terminal moves to a different called area as shown in FIG. 4. It is a sequence diagram which shows the operation example of the IP telephone switching system of FIG. It is explanatory drawing which illustrates the content of the outgoing message transmitted from the IP telephone terminal of FIG. It is a block diagram which shows the structure of the IP telephone switching system of Example 2. FIG. It is a sequence diagram which shows the operation example of the IP telephone switching system of FIG. It is explanatory drawing which illustrates the content of the outgoing message transmitted from the IP telephone terminal of FIG.

  An IP telephone switching system 10 that is Embodiment 1 of the present invention will be described with reference to FIGS.

  In FIG. 1, an IP telephone exchange system 10 includes an IP telephone exchange 100 connected to an IP network 200. The IP telephone exchange 100 is connected to wireless access points (hereinafter referred to as APs) 501 to 504 via an IP network 200. The IP network 200 is connected to a DHCP server 300 and IP telephone terminals 401 to 411 arranged in a plurality of called areas 1 to 4.

  The IP telephone exchange 100 manages the telephone numbers of a plurality of IP telephone terminals 401 to 411 and has functions such as call control of these terminals, an outside line incoming service, and an extension transfer service. The IP telephone exchange 100 has an area simultaneous reception function that allows an incoming call accompanied by a designation of a called area to be received by a plurality of IP telephone terminals 401 to 411 belonging to the designated called area. The IP telephone exchange 100 may also have a gateway function that enables calls with non-IP telephone terminals that do not have an IP address, such as analog telephone terminals and PHS. When there is a call from the IP telephone terminal, the IP telephone exchange 100 receives the telephone number, converts it into an IP address, and causes the IP telephone terminal having the converted IP address to receive the incoming call. IP telephone exchange 100 includes an area-specific network address correspondence map 110 and an extension data map 120.

  The area-designated network address correspondence map 110 includes an area-designated special number group composed of identification information different for each called area, and an IP address range group composed of a network address and a range of IP addresses belonging to the network corresponding to the network address. In addition, the area designation special number and the IP address range are associated one-to-one.

  The extension data map 120 associates each telephone number of each extension IP telephone terminal accommodated in the IP telephone exchange 100 with each IP address. The telephone number includes at least data that can uniquely identify the IP telephone terminal, and is, for example, the telephone number (extension number) of the IP telephone terminal. The IP address is an IP address assigned to the IP telephone terminal.

  The IP network 200 is, for example, a wired or wireless network that can communicate with an IP protocol such as LAN or WiFi (wireless LAN). Each of the plurality of IP telephone terminals 401 to 411 is accommodated in the IP telephone exchange 100 and can perform IP telephone communication via the IP network 200.

  The DHCP server 300 is a server that manages IP addresses for the IP telephone terminals 401 to 411, and has a function of automatically distributing IP addresses to the IP telephone terminals 401 to 411.

  The DHCP server 300 includes an IP address range table 310 having IP address ranges that can be assigned to the called areas 1 to 4. That is, the DHCP server 300 assigns IP addresses belonging to the IP address range corresponding to each called area in response to assignment requests from the IP telephone terminals 401 to 411 based on the DHCP protocol. For example, when there is an IP address acquisition request from an IP telephone terminal existing in the called area 1, an available IP address between 192.168.1.0 and 192.168.1.255 is set to IP Assign to phone terminals. In addition, when an IP telephone terminal to which an IP address is already assigned moves to a different called area, the DHCP server 300 requests an unused IP address corresponding to the moved called area from the IP telephone terminal. Depending on the new allocation. In the present embodiment, one DHCP server 300 is shown, but it is also possible to provide one DHCP server 300 for each called area.

  Called areas 1 to 4 correspond to floors 1F to 4F, respectively. One AP is arranged for each called area, and the radio area of each AP corresponds to each called area. The called areas 1 to 4 have different network addresses (IP address ranges) for each called area. In the present embodiment, description will be made on the assumption that the floors 1F to 4F correspond to the called areas, but a plurality of called areas may be formed in the same floor. Furthermore, the number of called areas is not limited to the number shown.

  IP telephone terminals 401 to 411 include a wired communication terminal (for example, IP telephone terminal 403) and a wireless communication terminal (IP telephone terminal 401) that realize IP telephone communication in IP network 200. The telephone numbers of the IP telephone terminals 401 to 411 are held in the extension data map 120 in the IP telephone exchange 100. Note that SIP (Session Initiation Protocol) is mainly used for call control between IP telephone terminals. Further, the number of IP telephone terminals arranged is not limited to the number shown. The IP telephone terminals 401 to 411 transmit an IP address assignment request to the DHCP server 300 via the IP network 200 when no IP address is assigned thereto. When the IP telephone terminals 401 to 411 are assigned IP addresses, the IP telephone terminals 401 to 411 notify the IP telephone exchange 100 of their own IP addresses.

  The APs 501 to 504 relay the connection between the IP telephone switch 100 and a wireless IP telephone terminal (for example, the IP telephone terminal 401) such as a WiFi terminal existing in its own wireless area via the IP network 200. Further, the APs 501 to 504 relay the connection with the DHCP server 300 via the IP network 200 when there is an IP address acquisition request from the wireless IP telephone terminal.

  With reference to FIG. 2, a called area designation call processing routine in the IP telephone exchange 100 will be described. The IP telephone exchange 100 determines whether or not an outgoing message transmitted from the calling terminal, that is, an incoming call has been received (step S101). When receiving the outgoing message, IP telephone exchange 100 determines whether the outgoing message includes designation of the called area (step S102).

  The IP telephone exchange 100 holds a correspondence relationship between a predetermined called area and a network address (step S103). If the call message includes designation of the called area, the IP telephone exchange 100 converts the designated called area into a network address according to the correspondence relationship held by itself (step S104). Here, it is preferable that the IP telephone exchange 100 obtains the network address by referring to the area designation network address correspondence map that associates each of the called areas with each of the network addresses. It is preferable if the correspondence between the predetermined called area and the network address can be changed according to an external command. The network address may be an IP address range corresponding to the network address.

  Next, the IP telephone exchange 100 extracts each IP address of the telephone terminal belonging to the network corresponding to the network address as an incoming call number (step S105). The incoming call is received simultaneously for each of the telephone terminals corresponding to the incoming call number (step S106). In other words, the IP telephone exchange 100 allows all the extensions existing in the called area designated by the called area designation to be received simultaneously.

  All telephone terminals existing in the called area are received and one of the telephone terminals responds (step S107). A call between the calling terminal and the telephone terminal that has responded is connected, and a call state is established (step S108).

  In FIG. 3, a subroutine for changing the correspondence between the called area and the network address in the IP telephone exchange 100 will be described.

  The IP telephone exchange 100 determines whether or not there is an external instruction to change the correspondence relationship between the called area and the network address (step S201). If there is an external instruction, IP telephone switch 100 takes in the designated called area and network address (step S202). The IP telephone exchange 100 changes the correspondence between the called area and network address held in the area-designated network address correspondence map according to the fetched designated called area and network address (step S203).

  In FIG. 4, an operation example when the IP telephone terminal 401 (extension 500) existing in the called area 1 moves to the called area 2 will be described.

  IP telephone terminal 401 moves from called area 1 to called area 2 (step S301). When the IP telephone terminal 401 leaves the called area 1, the IP telephone terminal 401 releases the IP address 192.168.1.1 assigned to the IP telephone terminal 401 and sends an IP address acquisition request to the called area 2 via the AP 502. To the DHCP server 300 (step S302).

  The DHCP server 300 recognizes that the IP address acquisition request is transmitted from the IP telephone terminal from the called area 2 by receiving the IP address acquisition request via the AP 502. The DHCP server 300 refers to the IP address range table 310 and assigns an unused IP address (for example, 192.168.2.10) from the range of IP addresses corresponding to the called area 2. It transmits to IP telephone terminal 401 (step S303).

  When the IP address is assigned from the DHCP server 300, the IP telephone terminal 401 transmits a registration message to the IP telephone exchange 100 (step S304). This registration message includes the IP address assigned to itself and its own telephone number (for example, extension number 500). When receiving the registration message from the IP telephone terminal 401, the IP telephone exchange 100 captures it and updates the extension data map 120 held by itself according to the registration message (step S305). FIG. 5 shows an example of the extension data map 120 after the IP telephone terminal 401 has moved to the called area 2.

  FIG. 6 shows an operation example of the IP telephone exchange 100 when the incoming call from the IP telephone terminal 403 includes designation of the called area 2 after the IP telephone terminal 401 moves to the called area 2. The IP telephone terminal 403 transmits an outgoing message including the area designation special number 2222 to the IP telephone exchange 100 (step S401).

  The IP telephone exchange 100 extracts the area designation special number 2222 that is the designation of the called area from the outgoing message (step S402 (1)). The IP telephone exchange 100 refers to the area designation network address correspondence map 110 and converts the extracted area designation special number into a network address corresponding to the area designation special number (step S402 (2)). The IP telephone exchange 100 searches whether all extensions registered in the extension data map 120 belong to the network corresponding to the converted network address (step S402 (3)). Since the IP address of the IP telephone terminal corresponding to the extension 500 and the extension 501 matches the network address and the upper 24 bits of the IP address, it belongs to the network corresponding to the converted network address. Therefore, the IP address 192.168.2.10 of the extension 500 (IP telephone terminal 401) and the IP address 192.168.2.11 of the extension 501 (IP telephone terminal 404) are extracted as incoming numbers (steps). S402 (4)). That is, it can be seen that the IP telephone terminal 401 and the IP telephone terminal 404 exist in the called area 2.

  The IP telephone exchange 100 causes the IP telephone terminals 401 and 404 corresponding to all the extensions (extension 500 and extension 501) existing in the called area 2 to receive all at once (step S403). The IP telephone terminal 401 responds to the incoming call, and a call with the IP telephone terminal 403, which is the calling terminal, is connected, and the incoming call to the IP telephone terminal 404 that has not responded to the incoming call is stopped (step S404).

  It should be noted that the network message corresponding to the called area may be included in the outgoing message in step S401. FIG. 7 shows an example of a SIP outgoing message including a network address corresponding to the designated called area. In the outgoing message, the extension header includes “X-TenantAddress: 192.168.2.0/24”, and the IP telephone exchange 100 that receives the outgoing message including this includes “X-TenantAddress: 192.168.2.0” in the extension header. / 24 "may determine the network address corresponding to the called area.

  An IP telephone switching system 10 that is Embodiment 2 of the present invention will be described with reference to FIGS.

  In FIG. 8, the IP telephone exchange system 10 of the second embodiment includes the same components as those of the IP telephone exchange system of the first embodiment, and the description of the same components is omitted.

  The called areas 1 to 4 include not only IP telephone terminals 401 to 411 but also non-IP telephone terminals 601 to 608 of wireless telephone terminals such as analog telephone terminals and PHS and non-IP wireless base stations (hereinafter referred to as CS) 701 to 701. 704. The IP telephone exchange 100 includes an area designation special number map 111 and an extension data existence area map 121. The area designation special number map 111 includes an area designation special number group consisting of identification information different for each called area, an IP address range group consisting of a network address and a range of IP addresses belonging to the network corresponding to the network address, and a non-IP Including the presence area group in which the telephone terminal exists, and the range of the IP address and the existence area are associated with the area designation special number. That is, the area designation special number map 111 is obtained by adding the correspondence with the existing area to the area designation network address correspondence map of the first embodiment. The extension data existence area map 121 includes not only telephone numbers and IP addresses of IP telephone terminals of all extensions accommodated in the IP telephone exchange 100 but also telephone numbers and existence areas of non-IP telephone terminals. That is, the extension data existence area map 121 is obtained by adding the extension number and existence area of the non-IP telephone terminal to the extension data map 120 of the first embodiment.

  IP telephone exchange 100 includes an extension trunk (not shown) that accommodates wired telephone terminals (such as analog telephone terminals) among non-IP telephone terminals. The telephone numbers and existence areas of these wired telephone terminals are set in advance and held in the extension data existence area map. Four CSs 701 to 704 respectively corresponding to the called areas 1 to 4 are connected to the IP telephone exchange 100, and a radio telephone terminal among non-IP telephone terminals is accommodated through the CS in one CS. When the wireless telephone terminal moves to a called area different from the called area, the CS in the different called area is connected to the wireless telephone terminal, and the presence of the wireless telephone terminal is present in the IP telephone exchange 100. Notify the area. As a result, the IP telephone exchange 100 updates the existence area of the extension data existence area map 121 held by itself.

  FIG. 9 shows an operation example of IP telephone exchange 100 when the incoming call from IP telephone terminal 403 includes designation of called area 2. The IP telephone terminal 403 transmits an outgoing message including the area designation special number 2222 to the IP telephone exchange 100 (step S501).

  IP telephone exchange 100 extracts area designation special number 2222 which is designation of called area 2 from the outgoing message (step S502 (1)). The IP telephone exchange 100 refers to the area designation special number map 111 and converts the extracted area designation special number into a network address corresponding to the area designation special number and also converts into an existing area corresponding to the area designation special number (step) S502 (2)). The IP telephone exchange 100 searches whether all the extensions registered in the extension data existence area map 121 belong to the network corresponding to the converted network address, and searches whether it belongs to the converted existence area. (Step S502 (3)). In the IP telephone terminal, the IP address 192.168.2.10 of the extension 500 (IP telephone terminal 401) and the IP address 192.168.2.11 of the extension 501 (IP telephone terminal 404) are extracted as incoming numbers. In addition, in the non-IP telephone terminal, the extension 510 (non-IP telephone terminal 602), the extension 511 (non-IP telephone terminal 603), and the extension 512 (non-IP telephone terminal 604) are extracted as incoming numbers (step S502). (Four)).

  The IP telephone exchange 100 is connected to all extensions existing in the called area 2, that is, not only to the IP telephone terminals 401 and 404 corresponding to the extension 500 and extension 501 but also to the extension 510, extension 511 and extension 512. The corresponding non-IP telephone terminals 602, 603, and 604 are simultaneously received (step S503). The IP telephone terminal 401 responds to the incoming call, and a call with the IP telephone terminal 403, which is the calling terminal, is connected, and the IP telephone terminal 404 and the non-IP telephone terminals 602, 603, and 604 that have not responded to the incoming call The incoming call is stopped (step S504).

  The outgoing message in step S501 may include designation of an incoming call only to the IP telephone terminal. FIG. 10 shows an example of a SIP outgoing message including designation of incoming calls only to IP telephone terminals. In the outgoing message, “X-CallTarget: IP” is included in the extension header, and the IP telephone exchange 100 that has received the outgoing message including this includes the called area by the “X-CallTarget: IP” in the extension header. The simultaneous incoming call may be made only to the IP telephone terminal corresponding to 2. In this case, the IP telephone exchange 100 allows only the IP telephone terminals 402 and 404 existing in the called area 2 to receive calls simultaneously. This is useful when calls between IP telephone terminals are desired in order to reduce voice encoding / decoding and prevent deterioration of voice data.

1-4 Called area 10 IP telephone exchange system 100 IP telephone exchange 110 Area designation special number table 120 Extension data table 200 IP network 300 DHCP servers 401-411 IP telephone terminals 501-504 Wireless access points 601-608 Non-IP telephone terminals 701 704 Non-IP wireless base station

Claims (4)

An IP telephone exchange system having an area simultaneous call function for receiving an incoming call with designation of a called area to a plurality of telephone terminals belonging to the designated called area,
Holding means for holding a correspondence relationship between a predetermined called area and a network address;
Network address conversion means for converting the designated called area into a network address according to the correspondence relationship;
Terminal address extracting means for extracting each of the IP addresses assigned to all telephone terminals belonging to the network corresponding to the network address as an incoming call number;
Telephone terminal receiving means for receiving the incoming call all at once to all of the telephone terminals corresponding to the called number;
An IP telephone exchange system comprising:   2. The network address conversion unit according to claim 1, wherein the network address conversion unit acquires the network address by referring to an area-specified network address correspondence map that associates each of the designated called areas with each of the network addresses. The described IP telephone switching system.   3. The IP telephone exchange system according to claim 1, wherein the holding unit includes a changing unit that changes a correspondence relationship between the designated called area and the network address in accordance with an external command.   When the telephone terminal moves to a called area different from the called area and has been assigned an IP address corresponding to the network address of the different called area, the registration message sent by the telephone terminal 4. The IP telephone exchange system according to claim 1, further comprising IP address fetching means for fetching an included IP address.

Images