JPH01164154A - Digital telephone system - Google Patents

Abstract

PURPOSE:To transfer a call without newly drawing in a telephone line by calling a set transferring destination through an empty channel at the time of receiving an incoming call and setting a turning back route by a response from the other party. CONSTITUTION:A CPU 51 has a memory to store data to indicate transferring destination information inputted from an operating part 50, a transferring means to execute an incoming call processing as it is when the data are not written in the memory and execute a calling according to the written data through the dead channel when the data are written in the memory, and turning back route setting means to control a channel switching circuit 53, connect two channels, which are a B1 channel 54 and a B2 channel 55, and set the turning back route when the response is received for the calling. Thus, the new telephone line becomes unnecessary to be installed, and a transferring processing can be executed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital telephone device having a transfer function.

[Conventional technology]

BACKGROUND OF THE INVENTION Conventionally, there are telephone devices that have a forwarding function that automatically forwards an incoming call to a predetermined destination when the called party leaves the telephone. This involves installing a new telephone line in addition to the conventional telephone line, using one telephone line for incoming calls and the other for transferring calls, and when transferring calls, the two telephone lines are connected at the receiving phone. The connections are made so that a turnaround route is formed.

[Problem that the invention seeks to solve]

However, this conventional method requires installing a new line that is not used except for transfers, which increases equipment costs, and the transmission path becomes longer due to loopbacks. There was a limit to how far I could go.

[Means for solving problems]

In order to solve this problem, the present invention uses a digital telephone device and uses two channels within the telephone device to perform callbacks.

[Effect]

With this configuration, when a call is received, a call is made to the set transfer destination via an empty channel, and a return route is set based on the response from the other party.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, 1 is an exchange equipped with basic functions of, for example, 2a, 2 is a 2W line, 3 is a line termination unit (DSU), 4 is a 4W line, 5 is a digital telephone device, and 6a and 6b are terminal devices. The digital telephone device 5 assembles Bl, B2, and D channels via a layer 2 control section 52b in which a CPU 51 controls the transmission and reception of D channel information in response to operations on an operation section 50 equipped with a dial, a hold button, and other operating functions. This C
The PU 51 controls the channel switching circuit 53 to select which of the B, channel 54, or 82 channel 55 is to be output to which of the communication lines 56 and 57. Reference numeral 58 denotes a call control unit that connects the call lines 56 and 57 to the terminals 7a and 7b, respectively, and converts analog signals and digital signals using a built-in codec. Reference numeral 59 denotes a display section for displaying call charges and the like.

The CPU 51 has a memory that stores data representing the transfer destination information input from the operation unit 50, and when no data is written in the memory, it directly processes the incoming call, and when data is written, it processes the incoming call. A transfer means that makes a call via an empty channel according to the written data, and a return means that connects the two channels of Bl + 82 and sets a return route when there is a response to the call. and route setting means.

The apparatus configured in this manner is controlled according to the flowchart shown in FIG. That is, step 1
When a call setup is received from the network as shown in step 00, it is determined whether or not to reject it as shown in step 101. If "NO", it is determined whether or not there is a forwarding destination in step 102. A judgment is made.

If data representing the transfer destination is input from the operation unit 50 at this point, step 102 is determined to be rYEsJ;
After carrying out the process of transmitting a call to the network shown in steps 103 and 104, the call setup is transmitted to the network.

Through this processing, the network performs a predetermined sequence of processing, and the information is sent back sequentially, so step 1
As shown at 05 to 107, signals representing acceptance, paging, and response are sequentially received from the network. and step 108,
109, information indicating response confirmation to the network;
and information representing the response, step 110
As shown in step 111, a signal representing an acknowledgment sent from the network is received, and as a result, B is sent as shown in step 111.
The transfer process is completed by connecting the l channel and the aS channel.

Note that the process of determining whether or not it is a refusal in step 101 is
gs", a signal indicating release completion shown in step 112 is sent to the network, and if the determination in step 102 that there is a forwarding destination is "NO", step 113
A signal representing the call is sent to the network as shown in FIG. At this time, a discharge sound is sent to the terminal. As a result, the terminal performs off-hook processing shown in step 114, and the subsequent steps are not shown in the figure.

Enter into a sequence of calls that do not occur. At this time, terminal 7a
, 7b are randomly connected to the two channels Bl + B2.

〔Effect of the invention〕

As explained above, in this invention, the Bl channel and B channel are connected at the time of transfer, so there is no need to install a new telephone line as in the conventional case, and the transfer process can be easily performed. Since it is a digital telephone, it has the advantage that call quality does not deteriorate even if the line distance becomes longer due to transfer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flow chart showing the operation. 1...Switchboard, 5...Digital telephone device, 7
a, 7b-...terminal, 50...dedicated part, 52k...
...Layer 2 control unit, 52α...Layer 1 control unit, 53...Fist channel switching circuit, 5411...1I
B1 channel, 55...-CB2 channel, 56.
57--Talking line, 58--Telephone control circuit.

Claims (1)

[Claims] A digital telephone device having at least two channels, comprising a transfer destination data setting means for setting transfer destination data, a transfer destination data storage memory for storing the set transfer destination data, and a transfer destination data storage memory for storing the set transfer destination data. A transfer means that processes an incoming call as is when no data is written, and makes a call via an empty channel according to the written data when data is written; 1. A digital telephone device comprising return route setting means for setting return routes for two channels when a response is received.