JPH0324851A - Isdn terminal equipment - Google Patents

Abstract

PURPOSE:To store the attribute and the number of the other party as the call originating source only at the time when the other ISDN terminals on the same fundamental interface bus do not respond to the call coming during communication by constituting ISDN terminal equipments so that they can take in packets on an echo channel. CONSTITUTION:Since a user protocol packet is turned back as an echo channel E on the side of a network 23 as it is when being transmitted to a D channel independently between terminals, ISDN terminal equipments 21 (21a and 22b) communicating with each other at present monitor the echo channel E by echo channel monitor parts 27. It is discriminated by a controller 35 whether the other ISDN terminal equipments connected to the same ISDN fundamental interface bus respond to the call coming from another ISDN terminal or not, and the attribute and the number of the other party as the call originating source are stored in a memory when any ISDN terminal does not respond to the incoming call.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to rsDN terminal devices such as telephones and terminal adapters that can be connected to an ISDN basic interface.

Conventional technology FIG. 3 shows the configuration of a conventional ISDN terminal device.

In FIG. 3, reference numeral 1 denotes an ISDN terminal device connected to a network 3 via a transmission line 2.

This ISDN terminal device 1 includes a layer 1 interface 4 for connecting to an electric transmission line 2, assembling a transmission frame,
An ISDN interface system consisting of a layer 1 control unit 5 that performs decomposition and a layer 2 control unit 6 that controls packet transmission on the D channel, an audio system interface 8 for connecting a receiver 7, etc., and a personal computer 9. The existing interface system is composed of a serial input/output interface 10 that accommodates data such as data through a serial transmission procedure, and a man-machine interface 13 that connects a numeric keypad 11 and a display device 12, and a block that performs ISDN call connection control. The terminal device 1 includes a controller 14 that exchanges control information with each block within the terminal device 1.

Then, by turning on-hook the handset 7 and inputting the other party's number from the numeric keypad 11, the controller 14 assembles an ISDN call connection control message and passes it to the layer 2 control unit 6. The layer 2 control unit 6 that received the message establishes a data link with the network 3 via the layer 1 control unit 5, layer 1 interface 4, and transmission path 2, and sends the call connection control message to the network 3. Enables sending and receiving between

Furthermore, in order to prevent multiple terminals from accessing the D channel at the same time, access contention control using an echo channel is performed.

In this way, even with the above conventional ISDN terminal device, CCIT
By having the layer 1 interface 4, layer 1 control unit 5, layer 2 control unit 6, and controller 14 fulfill the functions of ISDN layers 1 to 3 in accordance with the T recommendation,
Voice and data communication can be performed with other terminal devices via the network 3.

Problems to be Solved by the Invention However, with the above-mentioned conventional ISDN terminal device, even if an incoming call is received from another ISDN terminal while communicating with another ISDN terminal via the network, the communicating ISDN terminal is not connected to the same user. - There was a problem in that it was not possible to determine whether or not other ISDN terminals connected in a multi-bus manner on the network interface responded to the incoming call.

The present invention solves these conventional problems,
During communication, if there is an incoming call from another ISDN terminal via the network, it is determined whether an ISDN terminal connected to the same ISDN terminal interface bus has responded to the incoming call, and the response is determined. It is an object of the present invention to provide an excellent ISDN terminal device that stores the attributes of the terminal of the call originator and the number of the other party when it is determined that the call is not available.

Means for Solving the Problems In order to achieve the above object, the present invention has an echo channel monitor unit that captures packets on an echo channel where a signal channel from a terminal to a network is looped back from the network as it is, and It is determined whether or not another ISDN terminal on the same basic interface bus responds to a call received from an ISDN terminal, and if there is no response, the attribute and The device is equipped with a controller that stores the other party's number in a memory.

According to the above-described structure, when an ISDN terminal device independently transmits a user protocol packet between terminals on the D channel, this packet is returned as an echo channel on the network side, so that the ISDN terminal device during communication By monitoring the echo channel with the echo channel monitor unit, the controller can determine whether another ISDN terminal device connected to the same ISDN basic interface bus has responded to a call received from another ISDN terminal. If the ISDN terminal does not respond to the incoming call, the attributes and number of the other party that is the originator of the call can be stored in memory.

Embodiment FIG. 1 shows the structure of an embodiment of the present invention. 2
1 is an ISD connected to the network 23 via the transmission line 22
N terminal device.

This ISDN terminal device 21 includes a layer 1 interface 24 that connects to a transmission line 22, a layer 1 controller 25 that assembles and disassembles transmission frames, a layer 2 controller 26 that controls packet transmission on the D channel, and an echo. An ISDN interface system consisting of an ego channel monitor unit 27 that captures packets flowing through the channel and packets sent from other terminals, an audio interface 29 for connecting a receiver 28, etc., and a personal computer 30 etc. Serial input/output interface 31 and numeric keypad 3 accommodated by transmission procedure
The existing interface system consisting of the man-machine interface 34 that connects 2 and the display device 33, and the ISD
The controller 35 is a block that implements N-call connection control processing as well as service processing based on the user protocol, and is provided with a controller 35 that exchanges control information with each block within the ISDN terminal device 21.

Figure 2 shows an example of connecting ISDN terminal equipment.
The ISDN terminal devices 21a and 2lb are connected to a network 23 via the same basic interface bus (transmission line) 22. 36 is a terminal accommodated in the network 23.

The ISDN terminal 21a and the ISDN terminal 21b are
When transmitting and receiving call connection control messages to and from the terminal 36 via the network 23, message packets are placed on the D channel from the terminal 36 to the network (hereinafter referred to as "upstream"), and from the network 23 to the terminal. Message packets flowing through the D channel (hereinafter referred to as "downstream") are captured. The downlink echo channel is the uplink D channel that is looped back as is, and is used for access contention control of the uplink D channel.

Next, the operation of the above embodiment will be explained. In the above embodiment, the ISDN terminal 21a connects to the ISDN via the network 23.
When a call arrives from another ISDN terminal while communicating with the terminal 36, the ISDN terminal 21a monitors the echo channel so that another ISDN terminal on the same basic interface bus, for example ISDNta terminal 2lb, responds to the incoming call. Decide whether you did or not.

The determination as to whether a response has been made is made by using a timer (not shown) in the controller 35 to identify whether or not a response message has been sent from another ISDN terminal within a certain period of time. As a result, if it is determined that there is no response from another ISDN terminal to the incoming call, the ISDN terminal 21a stores the attributes and number of the other ISDN terminal that is the originator of the incoming call during communication in the controller 35. memory (not shown).

In this way, according to the above embodiment, since the uplink D channel signal is looped back as an echo channel on the network side, by providing means for monitoring the echo channel, the same It is possible to judge whether or not another ISDN terminal on the basic interface has responded, and if there is no response from another ISDN terminal, it is possible to memorize the attributes and number of the other ISDN terminal that is the originator of the call. Can be done.

Effects of the Invention As described above, the present invention is configured to be able to capture packets on the echo channel, so when a call arrives during communication, other ISs on the same basic interface bus
This method has the effect that the attributes and number of the other party who is the originator of the call can be stored only when the DN terminal does not respond.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an ISDN terminal device according to an embodiment of the present invention, FIG. 2 is a schematic block diagram showing the connection state of the ISDN terminal device of FIG. 1, and FIG. 3 is a block diagram of a conventional ISDN terminal device.
FIG. 2 is a block diagram of a terminal. 21.21a, 2lb-ISDN terminal equipment, 22...
Transmission path, 23...Network, 27...Echo channel monitor unit, 35...Controller. Figure 1

Claims (1)

[Scope of Claims] An echo channel monitor unit that captures packets on an echo channel where a signal channel from a terminal to a network is returned as is from the network, and a call that is received from another ISDN terminal during communication. The echo channel monitor unit determines whether or not another ISDN terminal on the same basic interface bus has responded by monitoring the echo channel, and if it has not responded, the other ISDN terminal that is the originator of the call An ISDN terminal device, comprising: a controller that stores attributes of the terminal and a destination number in a memory.