JPH1093727A - Isdn corresponding communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ISDN corresponding communication equipment with specified call preferential connecting function with which the communication of analog terminal of an important call is made preferential by temporarily disconnecting a data line and a data communication can be continuously performed by connecting a data terminal to a line again, after the end of communication of an analog terminal when originating an important call, while two lines are occupied by a date terminal and an analog terminal related to a terminal connected to an ISDN line. SOLUTION: When originating the important call from a 2nd analog terminal 13, while a data terminal 11 and a 1st analog terminal 12 are in communicating state, the important call is identified by detecting a specified character string sent through an important call origination detection part 8 and after the communication of the data terminal has been interrupted by flow control, the line is disconnected. Then, the important call is communicated, while using a transmission channel made idle by disconnecting the line and after the end of communication of the important call, the line of the data terminal is reconnected. Then, the interruption of data transmission is canceled by flow control, and remaining data can be transmitted in continuation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN-compatible communication apparatus which enables an outgoing call for an important call when there is no available channel among terminal apparatuses connected to an ISDN network.

[0002]

2. Description of the Related Art Since only two telephone lines are available for communication with ISDN for general subscribers, the third communication cannot be accepted if both lines are in use.
Therefore, in order to make an important call while both lines are in use, the connected call in use has to be artificially cut off before making the call. In Japanese Unexamined Patent Publication No. Hei 3-173240, "ISDN terminal transmission queuing method", transmission when there is no available transmission channel is made to wait in a queue, and the use state of the transmission channel is monitored periodically. In order to make a call connection for the terminal in the middle, it was not possible to make a real-time connection for an outgoing call requiring urgency.

[0003]

As described above, the ISDN line for general subscribers has only two communicable lines for two telephone lines, so if both lines are in use, the third communication line is used. Was not accepted. Therefore, conventionally,
In order to make an important call while both lines are in use, it is necessary to artificially cut off the connected call in use and then make the call. In Japanese Unexamined Patent Publication No. Hei 3-173240 "ISDN terminal transmission queuing method", transmission when there is no available transmission channel is made to wait in a queue, and the use state of the transmission channel is monitored periodically. Because of the mid-call connection, real-time connection was not possible for urgent calls. The present invention has been made under such a background. When a terminal connected to an ISDN line occupies two lines with a data terminal and an analog terminal and makes an important call, the data line is used. ISDN compatible communication with a specific call priority connection function that allows the analog terminal to prioritize important call communication for important calls, and connects the data terminal to the line again after the analog terminal communication is completed so that data communication can be continued. It is intended to provide a device.

[0004]

According to the first aspect of the present invention,
A data terminal line accommodating unit accommodating a data terminal, an analog terminal line accommodating unit accommodating an analog terminal, and an ISDN
An ISDN station line accommodating section for accommodating an office line, and an apparatus control section for controlling the entire ISDN communication apparatus, the ISDN-compatible communication apparatus being connected to an ISDN station line having a predetermined transmission capacity for a predetermined line. Has the following configuration and control means. The communication system includes a channel management unit for managing a transmission channel to be used, an important call transmission detection unit for detecting an important signal transmission signal of an analog terminal connected to the ISDN communication device, and a data terminal connected to the ISDN communication device. And a destination number storage unit for storing the telephone number of the destination. Further, the control means detects that an important call is originated from another analog terminal and the important call origination detecting unit detects the important call origination in a state where the data terminal and the analog terminal occupy a predetermined line of the ISDN central office line. When the data transmission is interrupted while maintaining the communication state between the data terminal line accommodating unit and the data terminal, and the communication destination number of the data terminal is stored in the destination number storage unit, the channel of the data terminal is changed by the channel management unit. Once the communication is terminated, communication of an important call from another analog terminal is performed using the transmission channel vacated by the line disconnection of the data terminal, and after the end of communication of the important call is detected by the channel management unit, the partner number storage unit By the control means for reconnecting the line of the data terminal with the telephone number stored therein, canceling the interruption of the data transmission and continuing the data transmission.

According to a second aspect of the present invention, as a function of an important call transmission detecting section, by detecting a specific character string transmitted from another analog terminal, it is possible to identify an important call from another analog terminal. Features. According to a third aspect of the present invention, as a function of the device control unit, the line disconnection of the data terminal is performed after instructing the communication partner to interrupt the call using the user / user information of the ISDN.

[0006]

FIG. 1 is a block diagram showing the configuration of an ISDN-compatible communication device according to an embodiment of the present invention.
In this figure, reference numeral 1 denotes an ISDN-compatible communication device having a specific call priority connection function, and 2 accommodates one data terminal 11, controls an interface on the data terminal 11 side, maintains a communication state when a line is disconnected, and flows. A data terminal line accommodating unit for controlling the three analog terminals 12, 1
An analog terminal line accommodating unit accommodating 3 and controlling an interface with an analog terminal, 4 is an ISDN line accommodating unit accommodating one ISDN line, 5 is a channel managing unit for managing the number of transmission channels, and 6 is important. An important call transmission detecting unit for identifying a specific character string transmitted from an analog terminal when a call is transmitted, 7 is a destination number storage unit for storing a communication destination of a data communication call, and 8 is an ISDN call for performing call control of the ISDN protocol. The control unit 9 represents a device control unit that controls data communication and analog communication and controls the entire device.
FIG. 2 is a block diagram of a communication system including the ISDN network 21 and the analog public network 22. Reference numerals 1a, 1b
Is an ISDN communication device, 11a and 11b are data terminals, 1
2a, 12b, 13a and 13b are analog terminals,
1 corresponds to 1, 11, 12, and 13 in FIG.
It is connected to the N network 21. An analog public network 22 is connected to the ISDN network 21. Reference numerals 23 and 24 represent analog terminals connected to an analog public network.

Further, as a connection protocol for data communication in the above-mentioned communication system, a data terminal is handled by an asynchronous HDLC procedure, and flow control is performed by RS / CS flow,
The transmission speed on the ISDN line is 64 kbps, the specific character string for outgoing important calls is "### **", and a command to suspend on the user / user information when disconnecting the data call is given by "DATACON
NECTION SUSPEND "and a recovery instruction to be added to the user / user information when recovering from the suspended state are" DATA CONNECTION R
FIG. 3 is an operation sequence diagram in a case where an important call is originated from a state in which both of the two transmission channels of the ISDN office line of the ISDN communication device 1a in FIG. 2 are in use. Process p1 (hereinafter referred to as p1) ) To p30 are described as follows: p4, p5 = DISC (UU) ... request for call release (user / user information) p7, p8, p20 = RELEASE ... Channel disconnection completion notification and call number release request p9, p10, p21 = REL COMP ... channel release and call number release completion notification p11 = SETUP ... call setup request p13, p24, p25 = ALERT ... callee called notification p15, p26, p27 = CONNECT ... Notification that the called party has answered p18 = DISC ... Call release request p22, p2 = SETUP (U · U) Request for call setup (user / user information) In FIG. 3, the data terminal 11a connected to the ISDN-compatible communication device 1a and the data terminal 11b connected to the ISDN-compatible communication device 1b When performing data communication via the ISDN network between the ISDN-compatible communication devices 1a,
Based on the other party telephone number information sent from the data terminal 11a, the SDN call controller 5 makes a call connection to the ISDN compatible communication device 1b and, at the same time, stores the other party telephone number information in the other party number storage unit 6. If a call connection is made,
The channel management unit 7 stores connection channel information.

When a connection is made from the analog terminal 12a accommodated in the analog terminal accommodating section 3 before or after the data call connection, the channel used is stored in the channel management section 7 after the call connection as in the case of the data call. As described above, when the data terminal 11a and the analog terminal 12a are in a communication state and occupy two transmission channels, and are in the state of the process p1 (hereinafter referred to as p...) Of FIG. To make an important call from
# * "Followed by the other party's telephone number. The important call transmission detection unit 8 receives the""sent from the analog terminal 13a.
# **** indicates that the call is an important call, and the data of the channel management unit 7 indicates that the transmission channel is 2
Knowing that the line is also blocked, the data terminal housing unit 2
Stops the transmission / reception of data between the communication terminals by the flow control (p3) in which the CS line is turned off while maintaining the communication state with the data terminal 11a, and the ISDN call control unit 5 sends the ISDN communication device 1b of the communication partner to the communication partner 1b. Then, a disconnection instruction is issued (p4). At the time of disconnection, "DATA CONNECTION SUSPEND" indicating disconnection for call suspension is stored in the user / user information using the notification of information between users in the disconnection message. At the time of disconnection, the used channel information of the channel management unit 7 is cleared. In the ISDN communication device 1b on the disconnected side, the "DATA CONN" of the information notification between users in the disconnection message is transmitted.
When the ISDN call control unit 5 recognizes “ECTION SUSPEND” (p5), the data terminal accommodation unit 2 performs CS
The signal lines other than the lines are turned on, and the CS line is turned off to establish a state in which data transmission / reception is stopped (p6). At this time, the channel management unit 7 recognizes that one of the transmission channels is occupied and the vacant transmission channel is being suspended. ISD
The N-compatible communication device 1a sends an important call from the ISDN call control unit 5 using the transmission channel opened by the disconnection of the data communication call (p11), and the call is connected (p1).
2) The used channel is stored in the channel management unit 8, and the connection of the important call is completed (p16).

Next, in the ISDN-compatible communication device 1a, I
The channel management unit 7 reports that one of the two calls occupying the SDN transmission channel has been disconnected (p17 to p21).
When ISDN is recognized, the ISDN call control unit 5 re-transmits the interrupted data communication call to the other party telephone number stored in the other party number storage unit 6 (p22). At this time, "DATA CONNECTION RESUME" indicating recovery of the call interruption in the user / user information
Is added. In the ISDN communication device 1b of the communication partner, the ISDN call control unit 5 confirms the user / user information regarding the incoming of the data call, and issues a call interruption recovery instruction "DATA".
If a call setup message of "CONNECTION RESUME" is received (p23), an incoming call is accepted and a call connection is made (p2).
6). After the data call is connected (p27), the data terminal line accommodating unit 2 turns on the CS line on the data terminal side (p28), releases the data transmission / reception suspension state by the flow control, and returns to the state before the call disconnection. It is returned (p30). After the connection, the data terminal accommodation unit 2 turns on the CS line on the data terminal side (p29), and releases the data stop state of the flow control. As a result, the state returns to the state before the communication was disconnected, and the data communication is resumed (p30). As described above, the data transmission and reception of both communicating data terminals are interrupted by flow control. Since the communication is prioritized and the data terminal is reconnected after the end of the important call communication and the data transmission / reception is continued, the transmitted data is not wasted and highly efficient communication can be performed. The operation of one embodiment of the present invention has been described above in detail with reference to the drawings. However, the present invention is not limited to this embodiment, and there are design changes and the like that do not depart from the gist of the present invention. Are also included in the present invention.

[0010]

As described above, according to the present invention, when a terminal connected to an ISDN line occupies two lines with a data terminal and an analog terminal, an important call can be transmitted. After interrupting data transmission by flow control while maintaining the state as seen from the terminal, disconnect the line once, give priority to analog terminal communication for important calls, and reconnect the data terminal to the line after analog terminal communication ends. Since data communication can be continued by connecting, data transmitted until data transmission is interrupted does not become invalid, and important calls can be handled even if the data communication connection call in use is not cut off artificially. The effect that priority use can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an ISDN-compatible communication device according to an embodiment of the present invention.

FIG. 2 is a system diagram of an ISDN-compatible communication device connected to an ISDN network according to an embodiment of the present invention.

FIG. 3 is an operation sequence diagram when an important call is made from a state where a line is blocked.

[Explanation of symbols]

 1, 1a, 1b ISDN compatible communication device 2 Data terminal line accommodating unit 3 Analog terminal line accommodating unit 4 ISDN station line accommodating unit 5 ISDN call control unit 6 Other party number storage unit 7 Channel management unit 8 Important call transmission detection unit 9 Device control Unit 11, 11a, 11b Data terminal 12, 12a, 12b Analog terminal 1 13, 13a, 13b Analog terminal 2 21 ISDN network 22 Analog public network 23, 24 Analog terminal

Claims (3)

[Claims] A data terminal line accommodating unit accommodating a data terminal, an analog terminal line accommodating unit accommodating an analog terminal, an ISDN office line accommodating unit accommodating an ISDN office line,
An IS control unit for controlling the entire ISDN-compatible communication device, and having a transmission capacity for a predetermined predetermined line.
An ISDN-compatible communication device connected to a DN office line, comprising: a channel management unit that manages a used transmission channel; and an important call transmission detection unit that detects an important call transmission signal of an analog terminal connected to the ISDN-compatible communication device. A destination number storage unit for storing a telephone number of a communication destination of a data terminal connected to the ISDN-compatible communication device;
In a state where the predetermined line of the SDN station line is occupied, when an important call is transmitted from another analog terminal and the important call transmission detecting unit detects the important call transmission, the data terminal line accommodating unit and the The data transmission is interrupted while maintaining the communication state with the data terminal, and after storing the communication destination number of the data terminal in the destination number storage unit, the channel of the data terminal is once disconnected by the channel management unit,
The communication of the important call from the other analog terminal is performed using the transmission channel vacated by the line disconnection of the data terminal, and after the communication end of the important call is detected by the channel management unit, the other party number storage unit Control means for reconnecting the line of the data terminal with the telephone number stored therein, canceling the interruption of the data transmission, and continuing the data transmission. 2. The important call origination detecting unit identifies an important call from another analog terminal by detecting a specific character string sent from the another analog terminal. The ISDN-compatible communication device according to the above. 3. The apparatus control unit according to claim 1, wherein the line disconnection of the data terminal is performed after instructing a communication partner to interrupt a call using ISDN user / user information. The ISDN-compatible communication device according to claim 2.