JPH11113046A - Private exchange network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to more inexpensively execute a roaming transfer between businessmen by obtaining a routing number of a terminal from a mobile telephone number of the terminal when a cordless terminal for a business office has an incoming call and executing the roaming transfer to a private exchange of a visitor station concerned. SOLUTION: When a PS 43 has an incoming call, roaming transfer parts 52A and 52B refers to position registration data 54A and 54B from a PSN of the PS 43 and finds a routing number. Then, from the routing number is obtained a line concerned (for example, a specific signal trunk 60) and a roaming transfer is performed. The position registration data 54A and 54B are data for executing the roaming transfer to the PS 43 at the visitor station (in the case of a home station) or for receiving at the PS 43 from the routing number that is roaming-transferred (in the case of the visitor station) and consist of the PSN of the PS 43 and the routing number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange network system and, more particularly, to transmission and roaming of location registration information to a home station when a visitor station of a business cordless terminal (hereinafter referred to as PS) is changed. It is about transfer.

[0002]

2. Description of the Related Art In recent years, with the spread of mobile phones, mobile communication between offices has been performed even in private branch exchanges. In the PS, a private branch exchange normally located is used as a home station, and when a private exchange that directly communicates with the home station is changed due to movement of a carrier, the private branch exchange to which the PS is moved is called a visitor station.

The incoming call to the PS first arrives at the private branch exchange of the home station. At this time, if the PS is not at the home station, it is necessary to perform inter-enterprise roaming transfer for transfer to the visitor station. However, in order to perform inter-enterprise roaming transfer, information communication for transmitting the fact that the PS has moved to the visitor station from the visitor station to the home station is required.

[0004] This information communication cannot be performed by the conventional trunk line of the individual line system, and roaming between carriers cannot be performed only by the trunk line of the individual line system. Therefore, it is necessary to construct a communication interface of a common channel signaling system in a private branch exchange between offices. At present, an ISDN trunk line is used as the communication interface, and each office is connected by an ISDN trunk network. Building.

FIG. 6 is a configuration diagram of a conventional private branch exchange network system. In this figure, the private branch exchange 2A of the home station is the home station of PS12, and the private branch exchange 2B of the visitor station is the visitor station of PS12. BS6A, 6
B is a base station that communicates with PS12.

[0006] The private branch exchange 2A and the private branch exchange 2B are IS
Connected by a DN trunk 14 and an individual signal trunk 16,
An ISDN trunk trunk (I-PVT) 8A, 8B and a trunk (PVT) 10A, 10B are provided, respectively. The private branch exchange 2A and the private branch exchange 2B store the home station location registration data 4A and the visitor station location registration data 4A.
B.

[0007] When the PS 12 moves from the home station 2A to the visitor station 2B, location registration of the PS 12 is started in the private branch exchange 2B, and the mobile phone number of the PS 12 (hereinafter referred to as PS).
N) is stored in the position registration data 4B.

Further, the location registration information is transmitted to the private branch exchange 2A.
It is transmitted through a common channel (Dch) of the SDN trunk line 14. The private branch exchange 2A stores the transmitted location registration information in the location registration data 4A.

After the location registration is performed as described above, if there is an incoming call to the corresponding PSN, the private branch exchange 2A refers to the location registration data 4A and transfers the incoming call to the private branch exchange 2B based on the routing number. Therefore, either the ISDN trunk line 14 or the individual signal trunk line 16 is captured as a trunk line to the private branch exchange 2B, and the call is connected to perform roaming transfer.

[0010]

As described above, in the conventional private branch exchange network system, a roaming transfer call can be made using either the ISDN trunk line 14 or the individual signal line trunk line 16. Is transmitted between the visitor station 2B and the home station 2A, the ISDN trunk line 14 having a common channel signal (Dch) is essential.

[0011] Therefore, a user who has a private branch exchange between offices that has constructed only an individual signal trunk line is newly required for ISD.
It is essential to construct a communication network for the N trunk line 14, which is economically expensive.

[0012] Further, even for a user having a large number of business offices and business offices, it is practically difficult to extend the ISDN relay network to a small business office depending on the line size of the business office and the demand for services. Very difficult conditions are possible.

[0013] For this reason, there arises a problem of service imbalance that a roaming service between offices provided by a large-scale / medium-scale exchange cannot be implemented by a small-scale exchange.

The present invention has been made in view of the above points, and has as its object to provide a private branch exchange network system that can perform inter-enterprise roaming at a lower cost.

[0015]

FIG. 1 is a diagram illustrating the principle of the present invention. As shown in this figure, the present invention has BSs 22A and 22B that communicate with the PS 24, and a plurality of private branch exchanges 20A and 20B that control incoming calls to the PS 24 are IS
In the private branch exchange network system connected by the DN public lines 38A and 38B, the private branch exchange 20B when the PS 24 moves to its own station and becomes a visitor station of the PS 24 is provided to the PS 24 by the extension number for specifying the PS 24 in its own station. Visitor station position registration means 2 for registering the correspondence between the PS 24 and the extension number in the first storage means 26B.
8B and the PS24 home station 20 from the PSN PSN
Obtain the ISDN public number of A, and enter the ISDN public number into I
The location registration information including the PSN of the PS 24 and the routing number including the extension number and the information specifying the visitor station 20B is set in the called number information when the SDN public line is originated.
ISDN public line transmission time information editing means 30B to be set in the information at the time of connection of the DN public line, connection number information and I
An ISDN public line transmission connection control means 32B for making a call connection to the ISDN public line 38B using the information at the time of the SDN public line transmission connection is provided.

Private branch exchange 20A of the home station of PS24
Is a home station location for registering the correspondence between the routing number and the PSN in the second storage unit 34A when the incoming connection is made from the visitor station 20B through the ISDN public line 38A and the received information includes location registration information. Registration means 35
A, when there is an incoming call to the PS 24, the routing number of the PS 24 is obtained by referring to the second storage means 34A from the PSN of the PS 24 and the private branch exchange 20B of the corresponding visitor station.
Transfer means 36A for performing roaming transfer to
It is characterized by having.

According to the above configuration, when the PS 24 moves and the visitor station becomes the private branch exchange 20B, the PS 24
24 issues a location registration request to the BS 22B.
The visitor station position registering means 28B sends the PS24
An extension number is given, and the PSN and the extension number are registered in the first storage means 26B.

The ISDN public line transmission means 30B includes a PS
24 PSN to PS24 home station 20A ISDN
A public number is obtained, the ISDN public number is set as called number information at the time of ISDN public line transmission, and a routing number and P including an extension number and information for specifying the visitor station 20B are set.
The location registration information including the PSN in S24 is set in the information at the time of ISDN public line calling connection.

ISDN public line transmission connection control means 32B
Performs outgoing connection to the ISDN public line 38B using the called number information and information at the time of ISDN public line outgoing connection.
Thereby, the location registration information is transmitted to the private branch exchange 20A of the home station using the ISDN public line 38B.

The home station location registering means 35A is provided with an ISDN
When an incoming connection is made from the visitor station 20B through the public line 38A and there is location registration information in the received information, the correspondence between the routing number and the PSN is stored in the second storage means 3.
Register for 4A. As a result, the location registration information is transmitted to the home station 20A via the ISDN public line 3 instead of the ISDN trunk line.
8A and 38B, the location can be registered.

Then, the roaming transfer means 36A
When an incoming call is received in S24, the routing number of PS24 is obtained by referring to the second storage means 34A from the PSN of PS24, and roaming transfer is performed to the private branch exchange 20B of the corresponding visitor station.

According to the alternative, the private branch exchange 20B of the visitor station gives the PS24 an ISDN public line dial-in number for specifying the PS24 in the local station and an extension number corresponding to the dial-in number, and The correspondence between the extension number and the extension number is stored in the first storage means 26B, and the correspondence between the ISDN public line dial-in number and the extension number is stored in the second storage means 26B.
Visitor station position registration means 28B for registering in the storage means;
From PSN of PS to ISDN of home station 20A of PS24
A public number is obtained, the ISDN public number is set as called number information at the time of ISDN public line transmission, and location registration information including the ISDN public line dial-in number and the PSN of PS24 is set in the information at the time of ISDN public line transmission connection. IS
Using the DN public line transmission time information editing means 30B, the called number information and the information at the time of ISDN public line transmission connection, the IS
An ISDN public line transmission connection control means 32B for making an outgoing connection to the DN public line 38B, and a dial-in call from the home station 20A using the ISDN public line dial-in number through the ISDN public line 38B, and referring to the second storage means. , An extension number is obtained from the ISDN public line dial-in number, a PSN is obtained from the extension number, and the corresponding PS
24, and includes an ISDN public line incoming connection control means for making an incoming connection.

Private branch exchange 20A of home station of PS24
When the incoming connection is made from the visitor station 20B through the ISDN public line 38A and the received information includes location registration information, the ISDN public line dial-in number and the PS
N and a home station position registration unit 35A for registering the correspondence with N in the third storage unit.
The location registration information is obtained by referring to the third storage means from the PSN of No. 4 and if the location registration information is an ISDN public number,
Using the ISDN public number, the ISDN public line 38A
And roaming transfer means 36A for performing roaming transfer to the data.

Thus, the ISDN public line 38A, 3
Using 8B, registration of location registration information and roaming transfer can be performed. Also, the private branch exchange 2 of the home station
0A is connected from another private branch exchange 20B via the ISDN public line 38A, and when the received information includes location registration information, the old location registration information already exists in the second storage means 34A. If the old location registration information is
Home station location information release means to be released from the storage means 34A, and the ISDN public number of the old visitor station is obtained from the old location registration information, and the ISDN public number is set as the called number information when the ISDN public line is transmitted. PS indicated by registration information
N second ISDN public line transmission time information editing means for setting, in the information at the time of outgoing connection, position registration release information for instructing release of registration of the relationship between PS and extension number stored in the first storage means 26B including N It is preferable to include second ISDN public line transmission connection control means for making a call connection to the ISDN public line 38A using the called number information and the information at the time of ISDN public line transmission connection.

The private branch exchange of the old visitor station is IS
When an incoming connection is made from the home station through the DN public line and the location registration release information is included in the received information, the registration of the relationship between the corresponding mobile phone number and extension number is released from the first storage unit 26B. And a visitor station position registration canceling means.

As a result, when the visitor station is changed, the location registration release information relating to the old visitor station is also transmitted to the I / O station.
It can be transmitted on the SDN public line 38A. Desirably, the ISDN public line originating information editing means 30B or the second ISDN public line originating information editing means includes location registration information or position information in the user individual information element defined by the ISDN public line 38B, 38A originating procedure. Configure to set registration cancellation information.

Since the ISDN public network does not need to be aware of the location registration information or the location registration release information, the private branch exchanges 24A and 24B make arrangements regarding the location registration, thereby facilitating the location registration. it can.

Preferably, the private branch exchange 20B of the visitor station has an ISD between the PS 24 and the home station 20A.
If the ISDN trunk line is connected to the N trunk line and the ISDN trunk line is in an unusable state, the ISDN public line 38
A first detour means for controlling the ISDN public line transmission time information editing means 30B so as to transmit the location registration information to the home station 20A through B.

As a result, even if the ISDN trunk line cannot be used, the ISDN public lines 36A, 36B
Can be used to convey location registration information,
The location registration can be performed reliably.

Preferably, when the private branch exchange 20B of the home station of the PS 24 is connected to the ISDN trunk line, the private branch exchange 20B of the visitor station transmits the location registration information to either the ISDN trunk line or the ISDN public line. The apparatus further comprises a line selecting means for selecting whether to use and transmit.

This makes it possible to select which of the ISDN trunk lines or the ISDN public lines 36A and 36B is used for location registration in accordance with the configuration of the network system of the private branch exchange, traffic, and the like. Can be performed efficiently.

More preferably, the private branch exchange 20B of the visitor station has the private branch exchange 20A of the home station of the PS 24 connected to an ISDN trunk via a signal relay station, and performs location registration using the ISDN trunk. When information is transmitted, when the ISDN relay line becomes unusable at the signal relay station and a response information reception timing out occurs, the signal relay station transmits the information through the ISDN public line 38B.
In order to transmit the location registration information to the home station 20A, the IS
Second controlling the DN public line transmission time information editing means 30B
It further comprises a bypass means.

Thus, during transmission of the location registration information,
Even when the signal relay station becomes unusable,
The location registration of the location registration information can be performed using the ISDN public lines 36A and 36B.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 2 is a block diagram of a private branch exchange network system according to the first embodiment of the present invention.

As shown in this figure, in the private branch exchange network system, a plurality of private branch exchanges 40A and 40B
It is connected to a public network via SDN public lines 58A and 58B.

The private branch exchanges 40A and 40B perform outgoing connection control and incoming connection control for terminals such as telephones and PS24 (not shown), and when their own stations become PS24 visitor stations due to the movement of PS24. The PS24 is used as a visitor station to register the location of the PS24, and the location registration information of the PS24 is transmitted to the home station via the ISDN public lines 58A and 58B. When the station becomes the home station, the routing number of the PS24 visitor station is transmitted. When the location is registered and there is an incoming call as the home station of PS24,
Roaming transfer is performed from the home station to the visitor station.

The private branch exchanges 40A and 40B are provided with trunks for the ISDN public lines 58A and 58B (not shown) and the BS4.
Terminals such as 1A, 41B, PS24 and a telephone (not shown) are accommodated.

The private branch exchanges 40A and 40B perform visitor station position registration units 42A and 42B for roaming transfer.
B, visitor station location registration open sections 44A, 44B, ISD
N public line transmission time information editing units 46A and 46B, home station position registration / cancellation units 47A and 47B, ISDN public line transmission connection control units 48A and 48B, ISDN public line reception connection control units 50A and 50B, roaming transfer unit 52A, 5
2B, location registration data 54A, 54B and ISDN public number registration tables 56A, 56B.

The BSs 41A and 41B communicate with the PS 24, receive a location registration request from the PS 43, perform an authentication check, etc., and then activate the visitor station location registration units 42A and 42B. .

The PS 43 performs communication for communication with the BSs 41A and 41B, and when the area of the private branch exchanges 40A and 40B is changed due to movement, the BS 43 transmits the communication.
A position registration request is made to 1A and 41B.

The visitor station position registration units 42A and 42B
In response to the location registration request from the PS 43, the PS 43 is provided with an extension number and a routing number including a line number for roaming transfer from the home station (for example, extension number + line number for roaming transfer from the home station).
The PSN of No. 3 and the routing number are registered in the location registration data 54.
A, 54B.

In this example, for example, the private branch exchange 40B
When the visitor station and the private branch exchange 40A in S43 are the home stations of the PS43, the roaming transfer is performed using the individual signal trunk 60, so the routing number is (extension number + line number of the individual signal trunk 60). .

Visitor station position registration canceling units 44A, 44B
Means that the visitor station of the PS 43 has changed and the private branch exchange 40
When the location registration release information is received from the home station when A and 40B are the old visitor stations of the PS 43, the PSN and the routing number of the PS 43 are released from the location registration data 54A and 54B.

ISDN public line originating information editing unit 46
A and 46B are for editing and setting transmission information when transmitting to the ISDN public lines 58A and 58B. Here, the outgoing information is called number information at the time of ISDN public line transmission, PSN of PS43 and location registration information, or P43 of PS43.
SN and location registration release information.

In the ISDN signal message, the area for setting the PSN and the location registration information or the PSN and the location registration release information is not particularly limited, but in this example, it is set in the user individual information element. This is because the user-specific information element is information that the user can freely use, and the user-specific information element is the user's ISD in the ISDN signal message.
An area in which information can be freely set in the private branch exchange without being conscious of the N switching network.

As described above, the location registration information is set in the user individual information element in the ISDN signal message because the location registration information is transmitted only between the visitor station and the home station. This is to make a call connection without considering the user individual information element.

Home station location registration / cancellation units 47A, 47B
The old visitor station is already registered in the home station location registration data 54A and 54B, and when the visitor station changes, the location registration data 47 of the old visitor station in the home station is changed.
A, 47B are released.

The ISDN public line transmission connection control unit 48A,
48B is an ISDN public line 58
A, 58B initiates outgoing connection and transmits location registration information or location registration release information to the ISDN public lines 58A, 58B in accordance with a later-described sequence.

The ISDN public line incoming connection control unit 50A,
50B is activated when there is an incoming call from the ISDN public lines 58A and 58B, and when the incoming call information includes location registration information or location registration release information, the home station location registration / release sections 47A and 47B or It activates the visitor station position registration canceling units 44A and 44B.

The roaming transfer units 52A and 52B are connected to the PS
When an incoming call is received at 43, a routing number is obtained by referring to the location registration data 54A and 54B from the PSN of the PS 43, and a corresponding line (for example, the individual signal relay line 60) is captured from the routing number and roaming transfer is performed. Is what you do.

The location registration data 54A and 54B are used to perform roaming transfer to the PS 43 at the visitor station (in the case of the home station) or to receive a call from the roaming-transferred routing number to the PS 43 (in the case of the visitor station). This is data for storing location registration information, and includes the PSN of the PS 43 and a routing number. The location registration data is composed of, for example, an index file using the PSN and the routing number as keys.

ISDN public number registration table 56A, 56B
From the PSN of PS43 to the ISD of the home station of PS43
This is for acquiring the N public number. For example, PS
Private branch exchanges 40A, 40B extracted from N or PSN
It consists of an index file that uses the telephone number of the user as a key.

The operation of the private branch exchange network system according to the first embodiment of FIG. 2 will be described below. The operation of the private branch exchanges 40A and 40B is exactly the same regardless of which is the home station and the visitor station of the PS 43. In this example, the home station of the PS 43 is the private branch exchange 40A and P
Description will be made assuming that S43 has moved and the private branch exchange 40B has become a visitor station.

(A) Registration of location registration information The PS 43 monitors the power of the received electric field, and when the power becomes weak, switches the channel and sends a location registration request signal to the BS 41B. Upon receiving the location registration request signal, the BS 41B requests the PS 43 for the PSN. BS41B receives PSN from PS43,
Activate the visitor station location registration unit 44B.

The visitor station position registering section 44B transmits the PS 43
, And a routing number including the extension number and a line number for roaming transfer from the home station 40A to the visitor station 40B (for example, the line number of the individual signal relay line 60) and the PS 43 are stored in the position registration data 54B. And activates the ISDN public line transmission time information editing unit 46B.

(B) Setting of outgoing call information The ISDN public line outgoing call information editing unit 46B transmits the PS43
From home PSN to home station ISDN public number registration table 56B
To determine the ISDN public number.

ISDN public line originating information editing unit 46B
Sets the ISDN public number of the home station 40A in the called number information of the ISDN message at the time of ISDN public line transmission, and information for instructing location registration in the user individual information element;
The location registration information including the location-registered PSN and the routing number is set, and the ISDN public line transmission connection control unit 4 is set.
Start 8B.

(C) Transmission of location registration information FIG. 3 is a sequence diagram of location registration / cancellation. ISD
The N public line transmission connection control unit 48B uses the transmission information
Start an outgoing connection to the ISDN public line 58B, and
An outgoing connection to the public line 58B is started, and as shown in FIG. 3, a call setup (SETUP) message is transmitted to the ISDN public line 58B, and measurement of the timer T1 for response message reception waiting timing is started.

Upon receiving the SETUP message, home station 40A transmits a call setup acceptance (CALL PROC) message. ISDN public line outgoing connection control unit 5
0B is set to S by receiving the CALL PROC message.
The transmission of the ETUP message is completed.

The private branch exchange 40A of the home station transmits the SETUP from the visitor station 40B through the ISDN public line 58A.
When the message is received, the ISDN public line incoming connection control unit 50A is activated.

ISDN public line incoming connection control unit 50A
Checks whether the location registration information exists in the user individual information element in the incoming information of the SETUP message, and activates the home station location registration / cancellation unit 47A if the location registration information exists.

The home station location registration / cancellation unit 47A stores the PSN and the routing number of the visitor station from the received location registration information in the location registration data 52A. And P
With reference to authentication key data (not shown) from the SN, an authentication key corresponding to the registered PSN is obtained, and the ISDN public line transmission time editing unit 46A is activated.

The ISDN public line originating editing unit 46A
The PSN and the authentication key are set in the user individual information element of the response (CONN) message, and the process returns to the ISDN public line incoming connection unit 50A. ISDN public line terminating connection unit 50A returns a CONN message to visitor station 40B.

Upon receiving the CONN message from the home station 40A within the timer T1 of the response message reception wait timing, the ISDN public line transmission connection unit 48B of the visitor station 40B sends an authentication request to the PS43 of the location registration request to the PS43 via the BS41B via the BS41B. Do it for

The ISDN public line transmission connection unit 48B
When the authentication key for the authentication request is received from the PS 43 through S41B, the authentication key in the CONN response message and the authentication result from the PS 43 are checked, and the normality of the PS 43 is confirmed. ,
Normal disconnection is set in the reason display, and a disconnection (REL) message is transmitted.

The home station determines whether or not the home station has the R
Upon receiving the EL message, the location registration is completed. (D) Transmission of location registration cancellation information When the location registration is completed, the home station location registration / cancellation unit 47A transmits the ISDN public line when the old location registration data already exists in the location registration data 54A. Activate the information editing unit 46A.

ISDN public line originating information editing unit 46A
Index the ISDN public line number table 56A from the routing number of the location registration data 54A of the old visitor station,
Determine the old visitor station's ISDN public number.

Then, the ISDN public number of the old visitor station is set as the called number information at the time of calling the ISDN public line, and the location registration release information including the location registered PSN and the information indicating the release of the registration is set in the user individual information element. And ISDN
The process returns to the public line transmission connection control unit 48A.

ISDN public line transmission connection control unit 48A
Starts an outgoing connection to the ISDN public line 58A according to the outgoing information, and transmits a SETUP message to the ISDN public line 58A.

The old visitor station receives the IS from the home station 40A.
Receives the SETUP message through the DN public line,
The SDN public line incoming connection control unit is activated, and when the location registration release information is present in the user individual information element in the incoming information, the visitor station location registration release unit is activated.

The visitor station position registration canceling unit receives the P
The location registration data is released from the SN, and the process returns to the ISDN public line incoming call connection control unit. The ISDN public line incoming connection control unit sends the CONN message to the home station 40A.
By returning the information, the old location registration of the corresponding PS 43 is released. As a result, the old location registration release information is
The home station 40A can transmit the information to the old visitor station through the N public line, and the home station and the visitor station can maintain the consistency of the location registration.

In the case where a timing out of response message reception wait occurs at the visitor station or the PS 43
If the authentication result becomes abnormal, the location registration information is released, and a disconnection (REL) message is displayed to the home station 40A by displaying the reason that the service cannot be used.

When the home station 40A also receives the REL message indicating the reason of the service being unavailable, the home station location registration is canceled. (E) Roaming transfer When there is an incoming call to the PS 43, the roaming transfer unit 52A is activated. The roaming transfer unit 52A uses the PS of the PS 43
From N, the routing number is obtained by indexing the position registration data 54A. The line indicated by the routing number is captured (in this case, the individual signal trunk line 60), and roaming transfer is performed to the visitor station 40B.

The visitor station 40B is connected to the individual signal trunk 60
The routing number is received by the trunk circuit via
The extension number is extracted from the routing number, the location registration data 54B is searched from the extension number, the PSN of PS43 is obtained, and the corresponding PS4 is transmitted from PSN through BS41.
3. Make an incoming connection to 3.

According to the first embodiment described above, IS
Connect the DN public lines 58A and 58B to the private branch exchanges 40A and 40A.
By connecting to B, it becomes possible to introduce a roaming transfer service between offices, and it can be expected that PS will be further spread in private branch exchanges.

Second Embodiment FIG. 4 is a configuration diagram of a private branch exchange network system according to a second embodiment of the present invention. Components having the same functions as the components in FIG. 2 are denoted by the same reference numerals. It is.

As shown in this figure, the private branch exchange network system comprises a plurality of private branch exchanges 70A, 70B, 7
A network is constituted by 0C and 70D. The private branch exchange 70B is connected to the private branch exchange 70A by the ISDN public lines 58B and 58A and the individual signal trunk 60, and the ISDN trunk is not constructed.

The private branch exchange 70B is connected to the private branch exchange 7
0C and ISDN public lines 58B, 58C and IS
They are connected by a DN relay line 74C. Further, the private branch exchange 70B is connected to the private branch exchange 70D via the ISDN public lines 58B and 58E and the relay station 78 via the trunk line 7.
4D and 74E.

In such a configuration, the private branch exchange 70
When the home station of PS 43 is the private branch exchange 70C at the time of becoming the visitor station of PS 43, the location registration information is transmitted using either the ISDN trunk line 74C or the ISDN public line 58B, 58C. Is also possible.

When the private branch exchange 70B becomes the visitor station of the PS 43 and the home station of the PS 43 is the private branch exchange 70D, the ISDN trunk line 76D → the relay station 78 → the ISDN trunk line 74E or the ISDN public line. 5
It is possible to transmit the location registration information using any of the lines 8B and 58D.

As described above, the transmission of the location registration information is based on the ISD
When it is possible to use either the N trunk line or the ISDN public line, the selection of which line is to be used first to perform location registration is registered in the signal line selection table 74B of the home station for each home station. doing.

Furthermore, even when an ISDN trunk line is established between the home station and the home station, the ISDN trunk line becomes unusable due to a failure or the like, or a relay station that relays the ISDN trunk line (for example, a relay station). Even when (78) becomes unusable, the detour route for transmitting the position registration information is registered in the signal line selection table 78B of the home station.

The signal line selection table 78B of the home station has a number specifying the home station, for example, a telephone number as a key.
It consists of an index file in which the type of line to be transmitted and the type of bypass line are registered.

The visitor station location registering section 74 B
Moves to the private branch exchange 70B, which is a visitor station, after performing position registration in the position registration data 58B,
The home station is specified from the PSN in S43, the line for transmitting the location registration information is selected from the signal line selection table 78B of the home station, and the ISDN public line transmission time information editing unit 46B or the ISDN trunk line transmission corresponding to the line is selected. Time information editing unit 90
B is started.

[0085] ISDN public line transmission connection control unit 86B
Means that, in addition to the function of the ISDN public line transmission connection control unit 48B in FIG. 2, when the ISDN public line 58B becomes unusable, a bypass ISDN trunk line is designated in the signal line selection table 76B of the home station. If it has been done, it activates the ISDN trunk transmission time information editing unit 88B.

The ISDN trunk line transmission connection control unit 88B
The private branch exchange 7 is passed through the ISDN trunk lines 74C and 74D.
In addition to the conventional function of transmitting the location registration information to the home station signal line selection table 76B when the ISDN trunk lines 74C and 74D become unavailable or the relay station 78 becomes unavailable, in addition to the conventional function of transmitting the location registration information to the home station 0C and 70D. ISDN Public Line 58B
Is activated, the ISDN public line transmission time information editing unit 44B is activated.

ISDN trunk transmission time information editing unit 90B
Is for setting outgoing call information to the ISDN trunk lines 74C and 74D. The other components have the same functions as the components in FIG.

The operation of the private branch exchange network system when the PS 43 moves to the private branch exchange 70B as a visitor station will be described below. (A) When the home station of the PS 43 is the private branch exchange 70A When the home station of the PS 43 is the private branch exchange 70A, the first
The description is omitted because it is the same as the embodiment.

(B) In the case where the home station of the PS 43 is the private branch exchange 70C The visitor station location registering section 82B assigns a routing number to the location registration data 58 as in the first embodiment.
B performs location registration. The visitor station location registration unit 82B
From the telephone number of the home station 70C of the PS 43 or the like, the signal line selection table 84B is indexed to select the line for transmitting the location registration information, and it is determined whether the selected line is in the usable state or the unusable state through the trunk. To check.

If the selected line (ISDN trunk line 74C or ISDN public line 58B) is in a usable state, this line is used in the same manner as in the first embodiment or the conventional method.
Transmits location registration information.

The selected line (ISDN trunk line 74)
C or the ISDN public line 58B) is in an unusable state, it is checked whether a detour route is designated by referring to the signal line selection table 84B of the home station. Via the route, the location registration information is transmitted in the same manner as in the first embodiment or the related art.

(C) When the home station of the PS 43 is the private branch exchange 70D The visitor station location registering section 82B assigns a routing number and assigns the location registration data 54 in the same manner as in the first embodiment.
B performs location registration.

The visitor station location registering section 82 obtains the signal line selection table 8 from the telephone number of the home station 70C of the PS 43 or the like.
By indexing 4B, a line for transmitting location registration information is selected, and it is checked through the trunk whether the selected line is in an available state or an unavailable state.

If the selected line (ISDN trunk line 74D or ISDN public line 58B) is in a usable state, this line is used in the same manner as in the first embodiment or the conventional method.
Transmits location registration information.

Here, it is assumed that the ISDN trunk 74D is in a usable state, and the location registration is performed using the ISDN trunk 74D. The visitor station location registration unit 82B
Activate the ISDN trunk transmission time information editing unit 90B. I
The SDN trunk transmission time information editing unit 90B sets the location registration information as the transmission information and activates the ISDN trunk transmission connection control unit 88B.

The ISDN trunk line connection control unit 88B
The location registration signal is transmitted on the common channel (Dch) of the ISDN trunk line 74D, and a response signal waiting timing (timer T1) is set when transmitting the location registration signal.

IS between relay station 78 and home station 70D
If the DN trunk line 76E becomes unusable due to a failure and a signal failure occurs, and the private branch exchange 70B, which is a visitor, times out for a response signal, the IS
The DN trunk transmission connection control unit 88B searches the signal line selection table 84B of the home station to check whether the detour route of the ISDN public line 58B is registered, and if the detour route is registered, the ISDN public The information editing unit 46B at the time of transmission of a line is activated, and I
The location registration information is transmitted using the SDN public line 58B.

[0098] The ISDN trunk line connection controller 88B
If the detour route has not been registered, the visitor station position registration canceling unit 44B is activated to cancel the position registration information. According to the second embodiment described above, the same effects as those of the first embodiment can be obtained. In addition, when both the ISDN trunk line and the ISDN public line are constructed between the visitor station and the home station, In addition to transmitting the location registration information by selecting one of the lines according to the convenience of the system, and transmitting the location registration information along a detour route when the selected line becomes unavailable. Thus, location registration can be performed more reliably, and roaming transfer can be performed more reliably. Thereby, the roaming transfer service can be improved.

Third Embodiment FIG. 5 is a block diagram of a private branch exchange network system according to a third embodiment of the present invention. Components having the same functions as the components in FIG. 2 are denoted by the same reference numerals. I have.

As shown in this figure, in the private branch exchange network system, a plurality of private branch exchanges 40A and 100B are connected to a public network via ISDN public lines 58A and 58B.

The private branch exchange 40A has the same function as the private branch exchange 40A in FIG. The private branch exchange 100B is the same as the private branch exchange 40B in FIG. 2 in that the location registration information is transmitted to the home station 40A by using the ISDN public line 58B, but the private branch exchange 100B transmits the location registration information to the private branch exchange 100B. The roaming transfer is performed using the ISDN public line 58A, 58B so that the dial-in number of the ISDN public line 58B is assigned as a routing number to register the location, and the ISD
Upon receiving an incoming call for roaming transfer from N public line 58B,
The point of making an incoming connection to the PS 43 is that of the private branch exchange 40 in FIG.
Different from B.

The private branch exchange 100B includes a visitor station position registration section 102B, a visitor station position registration release section 44B, a home station position registration / release section 47B, an ISDN public line transmission time information editing section 104B, and an ISDN public line transmission connection control section 48B. , ISDN public line incoming connection control unit 106B, location registration data 108B, ISDN public number registration table 56B
And ISDN public routing number compatible extension number conversion table 1
10B.

The visitor station position registering section 102B uses the PS4
When the PS3 moves to the private branch exchange 100B as a visitor station, the PS43 is provided with an ISDN so that the roaming transfer to the PS43 is performed using the ISDN public line 58.
A public routing number is assigned as a routing number, an extension number corresponding to the ISDN public routing number is assigned, the PSN of the PS 43, the ISDN public routing number and the extension number are registered in the position registration data 108B, and an ISDN public routing number is assigned. The correspondence between the ISDN public routing number and the extension number is registered in the corresponding extension number conversion table 110B.

Here, the ISDN public routing number is one of ISDN dial-in numbers assigned in advance corresponding to a plurality of extension telephone numbers assigned to the ISDN public line 58B. To P
Assigned for S43.

The visitor station position registration canceling unit 44 B
Since it has the same function as the inside visitor station position registration canceling unit 44B, the description is omitted. The ISDN public line originating information editing unit 104B sets the ISDN public number of the home station in the called number information when originating the ISDN public line,
The location registration information of the PSN and the ISDN public routing number is set in the user individual information.

Home station position registration canceling section 47B and ISD
The N public line transmission connection control unit 48B has the same functions as the home station position registration canceling unit 47B and the ISDN public line transmission connection control unit 48B in FIG.

ISDN public line incoming connection control section 106B
In addition to the function of the ISDN public line incoming connection control unit 50B in FIG. 2, when there is a dial-in incoming call on the ISDN public line 58B, an extension number corresponding to the ISDN public number is obtained, and Incoming connection is made to the PS 43 through the BS 41B to be connected.

The location registration data 108B is used for controlling the transmission of location registration information to the home station and the incoming call to the PS 43, and is a data in which PSN, ISDN public routing number and extension number are stored.

The ISDN public number registration table 56B is the same as the ISDN public number registration table 56B shown in FIG. The extension number conversion table 110B corresponding to the ISDN public routing number includes the PDN from the ISDN public routing number.
It registers information for converting to an extension number in S43, and is configured by, for example, an index file using an ISDN public routing number as a key. Roaming transfer unit 5
2B is the same as the roaming transfer unit 52B in FIG.

The operation of the private branch exchange network system according to the third embodiment of FIG. 5 will be described below. In this example,
The home station of PS43 is the private branch exchange 40A, and the PS4 is
3 will be described assuming that the private branch exchange 100B has become a visitor station.

(A) Registration of location registration information When the area changes, the PS 43 informs the BS 41B of the location registration information.
Issue a location registration request. BS41B is PS from PS43
Upon receiving N, it activates the visitor station location registration unit 102B.

The visitor station location registering section 102B uses the PS4
3, an extension number is given, an ISDN public dial-in number of the ISDN public line 58B to which no extension number is given is obtained as an ISDN public routing number, and the PSN of the PS 43, the ISDN public routing number and the extension number are registered in the location registration data. 108B.

The visitor station location registering section 102B uses the ISD
The N public routing number and the extension number are registered in the ISDN public routing number corresponding extension number correspondence table 110B, and the IS
Activate the DN public line transmission time information editing unit 104B.

(B) Setting of outgoing information The ISDN public line outgoing information editing unit 104B transmits the PS4
3 PSN to home station ISDN public number registration table 56
Index B to determine the ISDN public number.

ISDN public line originating information editing unit 104
B sets the ISDN public number of the home station in the called number information when calling the ISDN public line, and uses the PSN whose location has been registered and the ISDN of the visitor station as user-specific information elements.
The public routing number is set in the transmission information, and the ISDN public line transmission connection control unit 48B is activated.

(C) Transmission of Location Registration Information The ISDN public line transmission / connection control unit 48B uses the transmission information in the same manner as in the first embodiment, according to the sequence shown in FIG. The location registration information is transmitted to the connection control unit 50A. The home station location registration / cancellation unit 47A registers the PSN and the ISDN public routing number in the location registration data 54A.

(D) Transmission of location registration cancellation information If there is an old visitor station, the home station location registration / cancellation unit 47A transmits the location registration information of the old visitor station to the location registration data 5.
4A, and activates the ISDN public line transmission time information editing unit 46A.

ISDN public line originating information editing unit 46A
Index the ISDN public line number table 56A from the routing number of the location registration data 54A of the old visitor station,
Determine the old visitor station's ISDN public number.

[0119] Then, the ISDN public number of the old visitor station is set in the called number information when the ISDN public line is transmitted, and the location registration release information including the PSN whose location has been registered and the information indicating the release of the registration is set in the user individual information element. And ISDN
The process returns to the public line transmission connection control unit 48A.

ISDN public line outgoing connection control unit 48A
Makes an outgoing connection to the ISDN public line 58A according to the sequence with the old visitor station shown in FIG. 3, and transmits the location registration release information to the old visitor station.

Upon receiving the location registration release information, the ISDN public line incoming connection control unit of the old visitor station activates the visitor station location registration release unit to release the location registration information of the corresponding PSN from the location registration data. , Its PSN
If the ISDN public routing number is assigned to
SDN public routing number correspondence extension number conversion table 110B
Release information related to.

That is, the extension number and the ISDN public routing number assigned to the PS are released. Thus, when another PS moves to this old visitor station,
The released ISDN public routing number can be given to the PS.

(E) Roaming transfer When there is an incoming call to the PS 43, the roaming transfer unit 52A is activated. The roaming transfer unit 52A uses the PS of the PS 43
From N, the routing number is obtained by indexing the position registration data 54A. Here, it is assumed that the ISDN public routing number has been obtained.

The roaming transfer section 52A captures the ISDN public line 58A and performs roaming transfer using the ISDN public routing number. In the visitor station 100B, the home station 40A performs the ISDN by roaming transfer.
When there is a dial-in call on the public line 58B, the ISDN
Activate the public line incoming connection control unit 106B.

ISDN public line incoming connection control section 106B
From the dial-in number set in the incoming call information
Extension number conversion table 110 for ISDN public routing numbers
Is converted to the extension number assigned in the visitor station 100B, the location registration data 108 is indexed from the extension number, the PSN is acquired, and the PS 43 having the PSN is
Calling through S41B.

According to the third embodiment described above, the first
In addition to the same effects as the embodiment, the roaming transfer
This can be performed using the SDN public line, and the roaming transfer service can be improved.

In the third embodiment, the configuration for transmitting the location registration information may be the configuration of the second embodiment.

[0128]

As described above, according to the first to seventh aspects of the present invention, when the PS moves to the visitor station, the location registration information is transmitted to the home station using the ISDN public line. Since the location can be registered, the roaming transfer service can be improved.

According to the second aspect of the present invention, since the roaming transfer can be performed using the ISDN public line, the roaming transfer service can be further improved.

According to the fourth aspect of the present invention, since location registration information or location registration cancellation information is set as user individual information, the public network does not need to be aware of location registration information and the like. Registration of position registration information or cancellation of position registration information using a line can be realized.

According to the fifth aspect of the invention, when the ISDN trunk line or the ISDN public line is in an unusable state, the location registration information can be registered using the detour route, so that roaming is further performed. Transfer service can be improved.

According to the invention of claim 6, since either the ISDN trunk line or the ISDN public line can be selected and the location registration information can be registered, the roaming transfer service can be further improved. .

According to the seventh aspect of the invention, when the state becomes unusable at the ISDN relay station, the location registration information can be registered on the ISDN public line. Can be improved.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of a private branch exchange network system according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a sequence of location registration / release according to the present invention.

FIG. 4 is a configuration diagram of a private branch exchange network system according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a private branch exchange network system according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional private branch exchange network system.

[Explanation of symbols]

 20A Private branch exchange at home station 20B Private branch exchange at visitor station 22A, 22B BS 24 PS 26B First storage means 28B Visitor station location registration means 30B ISDN public line transmission time information editing means 32B ISDN public line transmission connection control means 34A Second storage Means 35A Home station location registration means 36A Roaming transfer means 38A, 38B ISDN public line

Claims (7)

[Claims] 1. A private branch exchange network system comprising a base station for communicating with a cordless terminal for business use, and a plurality of private branch exchanges for controlling incoming calls to the cordless terminal for business use connected by an ISDN public line. The private branch exchange when the office cordless terminal moves to its own station and becomes a visitor station of the office cordless terminal, the extension for specifying the office cordless terminal within the office to the office cordless terminal. Visitor station location registration means for assigning a number and registering the correspondence between the office cordless terminal and the extension number in the first storage means; and the home of the office cordless terminal from the mobile telephone number of the office cordless terminal. The ISDN public number of the station is obtained, and the ISDN public number is set as the called number information when the ISDN public line is transmitted. The location registration information including the routing number including the line number and the information for specifying the visitor station and the mobile phone number of the office cordless terminal is stored in the IS.
ISDN public line transmission time information editing means to be set in information at the time of DN public line connection connection; and ISDN for making a call connection to the ISDN public line using the called number information and the information at the time of ISDN public line connection connection. A public line transmission connection control means, wherein the private branch exchange of the home station of the office cordless terminal receives a call from the visitor station through the ISDN public line, and receives the location registration information in the received information. When there is a home office location registering means for registering the correspondence between the routing number and the mobile phone number in the second storage means, when there is an incoming call to the office cordless terminal, The routing number of the office cordless terminal is obtained by referring to the second storage means from the mobile phone number, and the corresponding visitor station is obtained. And a roaming transfer means for performing roaming transfer to the private branch exchange. 2. A private branch exchange network system comprising a base station for communicating with a cordless terminal for business use and a plurality of private branch exchanges for controlling incoming calls to the cordless terminal for business use connected by an ISDN public line. The private branch exchange when the office cordless terminal moves to its own station and becomes a visitor station of the office cordless terminal, the ISDN for identifying the office cordless terminal within the office to the office cordless terminal. A public line dial-in number and an extension number corresponding to the dial-in number;
Visitor station location registering means for registering the correspondence between the office cordless terminal and the extension number in the first storage means, and registering the correspondence relation between the ISDN public line dial-in number and the extension number in the second storage means; The ISDN public number of the home station of the cordless terminal for business is obtained from the mobile phone number of the cordless terminal for business, the ISDN public number is set as the called number information when calling the ISDN public line, and the ISDN public line dial-in number is set. And ISDN public line transmission time information editing means for setting location registration information including the mobile telephone number of the office cordless terminal in the information at the time of ISDN public line transmission connection, and ISDN public line outgoing connection control means for making an outgoing connection to the ISDN public line using the information of Through SDN public line, from said home station IS
A dial-in call is received using the DN public line dial-in number, the extension number is obtained from the ISDN public line dial-in number by referring to the second storage means, and the mobile phone number is obtained from the extension number. ISDN public line incoming call connection control means for calling and terminating a cordless terminal for an office to be established, wherein the private branch exchange of the home station of the cordless terminal for the office receives a call from the visitor station through the ISDN public line. Is performed, and when the location registration information is included in the received information, home station location registration means for registering the correspondence between the ISDN public line dial-in number and the mobile phone number in a third storage means, When an incoming call arrives at the office cordless terminal, the third storage means is referred to from the mobile phone number of the office cordless terminal. Roaming transfer means for obtaining the location registration information, and if the location registration information is an ISDN public number, performing roaming transfer to the ISDN public line by using the ISDN public number. Private branch exchange network system. 3. The private branch exchange of the home station is connected to another private branch exchange via the ISDN public line, and when the location registration information is included in the received information, the private storage exchange is stored in the second storage means. If the old location registration information already exists, home station location information release means for releasing the old location registration information from the second storage means; and obtaining the ISDN public number of the old visitor station from the old location registration information. Setting the ISDN public number as called number information at the time of originating the ISDN public line, and including the mobile phone number indicated by the old location registration information and the mobile phone number stored in the first storage means and the extension number. The second is to set the location registration release information instructing the release of the relationship registration in the information at the time of outgoing connection
ISDN public line transmission time information editing means; and second ISDN public line transmission connection control means for making a call connection to the ISDN public line using the called number information and the information at the time of the ISDN public line transmission connection. The private branch exchange of the old visitor station, when an incoming connection is made from the home station through the ISDN public line and the location registration release information is included in the received information, the corresponding office cordless terminal, the extension number and 3. The private branch exchange network system according to claim 1, further comprising: a visitor station position registration canceling means for canceling the registration of the relationship from the first storage means. 4. The ISDN public line outgoing information editing means or the second ISDN public line outgoing information editing means includes, in the user individual information element defined in the ISDN public line calling procedure, the location registration information or 3. The private branch exchange network system according to claim 1, wherein the location registration release information is set. 5. The private branch exchange of the visitor station, wherein an ISD is provided between the private branch exchange of the business office and the home station of the cordless terminal for business use.
If the ISDN trunk is connected to the N trunk and the ISDN trunk is unusable, the ISDN public line transmission is performed so that location registration information is transmitted to the home station through the ISDN public line. 3. The private branch exchange network system according to claim 1, further comprising a first detour means for controlling the time information editing means. 6. The private branch exchange of the visitor station, when the private branch exchange of the home station of the office cordless terminal is connected to an ISDN trunk, the location registration information is stored in the ISDN trunk or the ISDN public line. 3. The private branch exchange network system according to claim 1, further comprising a line selection means for selecting which one of the following is used for transmission. 7. The private branch exchange of the visitor station, wherein the private branch exchange of the home office of the office cordless terminal is connected to an ISDN trunk via a signal relay station, and the location is determined by using the ISDN trunk. When the registration information is transmitted, if the ISDN relay line becomes unusable at the signal relay station and a response information reception timing out occurs, the location of the home station is determined via the ISDN public line. Like communicating registration information,
2. The system according to claim 1, further comprising a second detour means for controlling the ISDN public line transmission information editing means.
Or the private branch exchange network system according to 2.