JPH0329447A - Isdn terminal equipment - Google Patents

Abstract

PURPOSE:To attain the transfer of an incoming call with a terminal equipment without special extension of lines by calling a terminal equipment being an incoming transfer destination onto other B channel with a telephone number of the incoming transfer destination registered in a storage device when an incoming call comes to one B channel, connecting both the B channels and transferring the incoming call to the transmission destination terminal equipment. CONSTITUTION:A telephone number of a terminal equipment 9 being an incoming call destination is registered in a memory map and when a call comes to a terminal equipment 10 via a B1 channel of a transmission side channel 3 and a B1 channel of a receiver side channel 7 in this state from the terminal equipment 2, the terminal equipment 10 dials automatically the telephone number registered on the memory map 11 and is connected to the terminal equipment 9 via two channels of the B2 channel of the transmission side channel and the reception side channel 5 via the D channel. On the other hand, the terminal equipment 10 is connected the B1 of the receiver side channel 7 and the B2 of the transmission side channel 8 and connected to the B2 of the reception side channel 7 and the B1 of the transmission side channel 8. Thus, the B1 channel of the terminal equipment 2 is relayed by the terminal equipment 10 and connected to the B2 channel of the terminal equipment 9 to apply the incoming call transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal device for an integrated service digital communication network, and more particularly to a call transfer method for an ISDN terminal device.

[Subject technology] Conventionally, in the incoming call transfer method for this type of terminal device, as shown in FIG.
2, when a call arrives at the analog terminal device 23 via the communication path 25, the number of the analog terminal device 24 to which the call is transferred is automatically dialed and the number of the analog terminal device 24 to which the call is transferred is set in advance in the analog terminal device 23. call,
When the analog terminal 24 responds, transfer is possible by connecting the communication path 26 and the communication path 25 between the analog terminal device 24 to which the incoming call is transferred and the analog terminal 23, with the analog terminal device 23 as a relay point. The terminal device 23 required a total of two lines, one line for incoming calls and one line for outgoing calls. Further, the same applies to the case of transferring on the terminal device side in the service integrated digital communication network where the public telephone network 22 is a digital line.

[Problems to be Solved by the Invention] The conventional method for transferring calls to terminal devices as described above requires two lines for one terminal device, so when the call is not being transferred, the line for calling is always idle, making it economical. It had the disadvantage of not being accurate.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ISDN terminal device that can transfer incoming calls without requiring any additional lines in terminals that can be connected to an ISDN basic interface.

[Means for Solving the Problems] The ISDN terminal device of the present invention includes: a storage device; a means for registering a telephone number of a call forwarding destination in the device; It has means for calling the terminal device of the destination of call transfer onto the other B channel using the telephone number of the destination of call transfer registered in the device, and transferring the incoming call to the terminal of the destination of call transfer by connecting both B channels. ing. [Sakukawa] I When a call is received on one B channel of the SDN terminal device, the phone number of the forwarding destination registered in advance in the storage device is automatically dialed and the forwarding destination is called to the other B channel. By connecting both eight channels within the terminal device, incoming calls can be forwarded using the device within the terminal device without the need to add additional lines.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a connection status diagram of a public telephone network in which a terminal device according to an embodiment of the ISDN terminal device of the present invention is accommodated, and FIG. 2 is an explanatory diagram of a call transfer connection of the terminal device 10 shown in FIG. 1. It is.

The terminal devices 2, 9.10 are connected to the public telephone network 1, and each has a communication channel Bl. B2 and signal channel D
Receiver channel 4.5.7 and transmitter channel 3 including
．． 6.8. B channel Bl, B2 is 6 4
Kbps communication channel, D channel is 16Kbps
s signal channel. In addition, each terminal device 2, 9.1
0, a memory map 11 in which a telephone number of a call transfer destination is registered, a means (not shown) for registering a call transfer destination in the memory map 11, and one communication channel, for example, B1.
When a call is received by a channel, the memory map 11 is referred to, the call forwarding destination is automatically dialed, the call is connected to the B2 channel, and the B1. It has means (not shown) for connecting B2 to transmitter channels B2 and B1, respectively. Furthermore, if there is an incoming call on the B2 channel, the incoming call transfer destination will be connected to the 81 channel.

Next, the operation of incoming call transfer in the terminal device 10 of this embodiment will be explained.

First, the telephone number of the terminal device 9 to which the incoming call is transferred is registered in the memory map in the terminal device IO. In this state, when a call is received from the terminal device 2 to the terminal device 10 via the Bl channel of the transmitting side channel 3 and the 81 channel of the receiving side channel 7, the terminal device 10 receives the memory map 1! automatically dials the telephone number registered in , and connects to the terminal device 9 via the D channel, 82 channels on the sending side channel 8 and 82 channels on the receiving side channel 5.

On the other hand, the terminal device 10 connects the receiving channel 7 81 and the transmitting channel 8 82, and the receiving channel 7 82 and the transmitting channel 8 81.

As a result, 81 channels of terminal device 2 are transferred to terminal device 10.
The received call is relayed by the terminal device 9 and connected to channel 82 of the terminal device 9 to perform incoming call transfer.

[Effects of the Invention] As explained above, the present invention provides communication channels Bl,
By using B2, there is an effect that incoming calls can be transferred to a terminal device using one line.

[Brief explanation of drawings]

FIG. 1 is a connection status diagram of the public telephone network in which the terminal device of the embodiment of the SDN terminal device of the present invention is accommodated, and FIG. 2 is an explanatory diagram of call transfer of the terminal device 10 shown in FIG. , 3rd
The figure is a connection diagram of a conventional example of call transfer by a terminal device. 1...Service comprehensive digital communication {. i network, 2,9.1
0...Terminal device, 3,6.8...Sending 3 side channel, 4,5.7...Receiving! Side channel, 11...Memory map

Claims (1)

[Claims] 1. 64Kbp of integrated service digital communication network ISDN
An ISDN terminal device capable of connecting a basic interface consisting of two B channels of 16 Kbps and a D channel of 16 Kbps, comprising: a storage device, a means for registering a telephone number of a call forwarding destination in the storage device, and one B channel. When there is an incoming call, the destination terminal is called on the other B channel using the destination phone number registered in the storage device, and the incoming call is transferred by connecting both B channels. An ISDN terminal device characterized by having means for transferring data to a destination terminal device.