JPH06269034A - Communication control method in in-premises system - Google Patents

Abstract

PURPOSE:To obtain an in-premises communication control method in which a caller number is displayed on a called terminal equipment as an extension number in the case of inter-extension communication by using plural general-purpose ISDN terminal equipments connecting to a same user network interface of ISDN for extension terminal equipments. CONSTITUTION:Telephone numbers for external line communication given to each extension and extension numbers for extension communication are stored in a management section 115 with cross reference. In the case of extension communication, a telephone number included in a setup message from a caller terminal equipment is read and the management section 115 is referenced to find out a relevant extension number and it is substituted and the result is sent to an extension interface 111. In the case of external line communication, the telephone number is not substituted and the message is sent to an external line interface 113.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control method in a premises system, and more specifically to an IS.
When there are an external line interface and an internal line interface that form a user / network interface of the DN, control of external line communication performed between an external line connected to the external line interface and each of a plurality of general-purpose communication terminal devices connected to the internal line interface, And a communication control method in a local system for controlling extension communication performed between a plurality of general-purpose communication terminal devices connected to the same extension interface without using an outside line.

[0002]

2. Description of the Related Art As a premises system capable of both external line communication and internal line communication, business phones, home telephones, P
There is a BX, etc., and in each case, it is composed of a main device and one or more terminal devices. In these premises systems, if there is an incoming call from an extension at a terminal device,
In order to know the caller of the extension, it is necessary to inform the called terminal device which extension terminal device the call is coming from.

In the above-mentioned business phone and home telephone, by using a dedicated terminal device, the caller of the extension can be known in the case of an incoming call from the extension. That is, in the case of an incoming call from an extension, the caller can be identified by displaying the extension number of the calling terminal on the display unit of the receiving terminal device.

On the other hand, in the case of PBX, a general-purpose terminal device is used to configure a premises system.
By changing the way the ringtone sounds, although it is possible to distinguish between an incoming call from an internal line and an incoming call from an external line, the caller cannot be known.

The ISDN service was started in Japan in 1988 and is about to reach the stage of widespread use. In ISDN, what defines the connection condition at the boundary point (specified point) when connecting a terminal device and a network is called a user / network interface,
I. It is stipulated by CCITT (International Telegraph and Telephone Advisory Committee) as a 400 series recommendation.

The ISDN service is controlled by layer 3 (network layer) information, and this layer 3 information is generally called a message. The call control is realized by exchanging messages such as call setup, response, disconnection, etc. between the calling side, the network, and the called side. In this ISDN user / network interface, multipoint communication is realized.

That is, a plurality of terminal devices can be always connected to the same interface, and a plurality of terminal devices can be used at the same time. For example, the transmission speed is 1
With the basic interface of 92 kbit / s, a maximum of 8 terminal devices can be connected to the same interface.

Further, in the ISDN terminal device, the user can set the caller number as the terminal identification information, and when the call is received, the caller number in the call setting message is displayed on the display unit of the call receiving terminal device. Thus, the caller can be identified. At this stage, ISD
There is no provision for extension communication in the N user-network interfaces.

[0009]

However, in the case of a business phone or home telephone, there is a problem that a dedicated terminal device is required to know which extension the call is coming from, and a general-purpose terminal device cannot be used. is there. on the other hand,
In the case of PBX, a general-purpose terminal device can be used, but in the case of an incoming call from an extension, there is a problem that it cannot be known from which extension the incoming call is coming.

On the other hand, in the ISDN user / network interface, since no regulation concerning extension communication is provided, extension communication cannot be performed only by connecting a general-purpose ISDN terminal device to the user / network interface. Let us consider a method in which a main unit for exchanging an extension is provided in the user / network interface of ISDN to enable extension communication.

For example, a telephone corresponding to a method shown in the specification of Japanese Patent Application No. 4-147965 and a communication control method (Haruhiko Kojima, Yoshiaki Iijima), that is, a number based on a number plan in a public network such as ISDN. Separately from the number and the telephone number, an extension number as a number that identifies the other party when performing extension communication is set in each terminal device, and the communication control device calls from the called number included in the call setup message. If it is an extension number and it is determined that it is an extension number, an extension exchange is performed to enable extension communication.

The extension number and the telephone number are identified by the number of digits of the number or the number of digits and the content of the number. In addition, in a general-purpose ISDN terminal device,
Only one number can be registered as the caller number, and normally only the telephone number is set. Therefore, since the caller number included in the call setting message is the telephone number set in each terminal device, the normal telephone number is displayed on the receiving terminal device even when the extension communication is performed. . Therefore, when a function such as redial is used, the caller is connected to the previous caller through the public network, which causes a problem that the call charge for using the public network is borne.

An object of the present invention is to solve such a problem, to use a general-purpose ISDN terminal device, and in the case of extension communication, display the caller's number as an extension number on the receiving terminal device. Another object of the present invention is to provide a communication control method in the local system.

[0014]

In order to achieve the above object, the present invention has an external line interface and an internal line interface constituting an ISDN user / network interface,
An external line is connected between an external line connected to the external line interface and each of a plurality of communication terminal devices connected to the internal line interface, and between the communication terminal devices connected to the same internal line interface. In a communication control device for a premises system that controls extension communication performed without intervention,

For each of the communication terminal devices, an extension number management unit is provided for managing and storing the telephone number for external communication and the extension number for extension communication assigned to the terminal device in association with each other.

[0016]

When the call control message for the purpose of extension communication is received from each communication terminal device on the extension side via the extension interface, the communication control device for the premises system makes a call originating in the call setup message. The telephone number in the person number column is read, the telephone number registered in the extension number management unit is compared, and when the extension number corresponding to the same telephone number is found, the extension number is set as the caller number column in the call setting message. To the extension interface side after substituting the telephone number instead of the telephone number,

When a call setting message intended for external line communication is received from each communication terminal device on the internal line side via the internal line interface, it is transmitted to the external line interface side as it is without performing the substitution.

In this way, when the extension side terminal device dials an extension number in the same system, the communication control device recognizes that this call setting message is intended for extension communication, and calls the call. The caller number included in the setting message is read out, checked against the telephone number registered in the extension number management section, the extension number corresponding to that telephone number is substituted for the caller number in the call setting message, and the call is sent to the extension side. By transmitting the call setup message, the caller's number can be displayed as an extension number on the terminal device of the called party.

Therefore, the called party can know the called party before responding to the incoming call, and can use the functions such as redial without using the public network.
On the other hand, when the extension terminal device dials an outside line number, that is, a telephone number based on a numbering plan in a normal public network, the communication control device recognizes that this call setting message is intended for outside line communication, and Since the caller number included in the call setup message remains unchanged and the call setup message is sent to the outside line side, the caller number is sent to the terminal device of the called party on the outside line side based on the number plan in the public network. Can be displayed as

From the above, when a call is received from another extension in the premises system, the extension number of the caller is displayed on the terminal device on the receiving side, and if an outside line is used, the caller on the terminal device on the receiving side is displayed. This will realize a premises system capable of displaying the telephone number of

[0021]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a communication control device for realizing an embodiment of the present invention. In the figure,
Reference numeral 101 is a communication control device, 131 is an ISDN, and 132 is an extension line.

The communication control device 101 includes an extension line interface 111, an exchange processing section 112, and an outside line interface 11.
3, a control unit 114, and an extension number management unit 115. The extension interface 111 interfaces with an extension and performs demultiplexing of information signals such as voice / data and control signals such as call control signals. The external line interface 113 interfaces with the ISDN and performs demultiplexing of information signals and call control signals.

The exchange processing unit 112 exchanges information signals between the extension interface 111 and the outside interface 113 under the control of the control unit 114.
The extension number management unit 115 stores and manages the extension numbers and telephone numbers of extension terminals connected to each other in association with each other.

The control unit 114 controls the extension / outside line identification means 12
1, a caller number extraction means 122, an extension number management section search means 123, and a caller number rewriting means 124. Extension /
The outside line identifying means 121 judges whether the call setup message of the call control signals received by the extension interface 111 is intended for extension communication or for extension communication.

For example, as shown in the specification of Japanese Patent Application No. 4-147965, a method of identifying the number of digits or the content of the number of digits can be considered. The caller number extraction means 122 reads out the caller number of the call setting message when the extension / outside line identifying means 121 determines that the call setting message is intended for extension communication.

The extension number management unit search means 123 reads out the extension number corresponding to the caller number extracted by the caller number extraction means 122. Caller ID rewriting means 12
Reference numeral 4 indicates the extension interface 11 by substituting the extension number read by the extension number management unit search means 123 into the caller number.
1 to send a call setup message.

FIG. 2 shows the communication control device 101 in FIG.
6 is a flowchart showing an operation when a call setup message is received from an extension. Please refer to FIG. When a call setup message is received from the extension 132 in step 1, the extension / outline identifying means 121 determines in step 2 whether the call setup message is a call intended for extension communication or a call intended for outside communication. To do.

In step 3, if the call is to an outside line,
In step 4, the call setup message is sent as it is to the ISDN 131 via the external line interface 113.
On the other hand, if the call is made to the extension in step 3, the caller number is extracted from the call setting message by the caller number extracting means 122 in step 5, and in step 6,
The extension number management unit 1 is searched by the extension number management unit search means 123.
15 is retrieved and the corresponding extension number is read out.

In step 7, sender number rewriting means 12
In step 4, the extension number is substituted into the caller number of the call setup message, and in step 8, the call setup message is transmitted to the extension 132 via the extension interface 111.

[0030]

As described above, according to the present invention,
When an incoming call arrives from another extension within the same system, the caller's extension number is displayed instead of the caller's telephone number on the receiving terminal device, so the callee answers the incoming call. Previously, not only can the sender be identified as an extension or an extension, but the extension number itself can be known, and functions such as redial can be used as extension communication without using the public network.

Further, when the extension terminal device dials an outside line number, the telephone number can be displayed on the partner terminal device.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a communication control device for realizing an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation when the communication control device 101 in FIG. 1 receives a call setup message from an extension.

[Explanation of symbols]

101 ... communication control device, 111 ... extension interface,
112 ... Exchange processing unit, 113 ... External line interface, 1
14 ... Control unit, 115 ... Extension number management unit, 121 ... Extension / outline identification means, 122 ... Recipient number extraction means, 123
... extension number management unit searching means, 124 ... caller number rewriting means, 131 ... ISDN, 132 ... extension

Claims (1)

[Claims] 1. External line communication that has an external line interface and an internal line interface that constitute a user / network interface of ISDN, and is performed between an external line connected to the external line interface and each of a plurality of communication terminal devices connected to the internal line interface. In a communication control device for a premises system that performs control and control of extension communication performed without an external line between a plurality of communication terminal devices connected to the same extension interface, for each of the communication terminal devices An extension number management unit that manages and stores the telephone number for external communication and the extension number for internal communication that are assigned to the terminal device in association with each other is provided for the purpose of extension communication from each communication terminal device. When the call setup message is received via the extension interface, it is included in the call setup message. The telephone number in the caller's number field is read out, the telephone number registered in the extension number management unit is checked, and the extension number corresponding to the same telephone number is found. After substituting the telephone number in the caller number field, the call setting message is transmitted to the extension interface side, and the call setting message for the purpose of external communication is received from each of the communication terminal devices via the extension interface. In this case, the communication control method in the local system is characterized by transmitting the data as it is to the outside line interface side without performing the substitution.