JPH0290754A - Data transmission system inter-isdn terminals - Google Patents

Abstract

PURPOSE:To make establishment of a packet exchanging call and a line exchanging call unnecessary by extracting data transferred from a sub-address information element included in an incoming call request, and then rejecting the incoming call request when an incoming side ISDN terminal receives an incoming call request from an ISDN network. CONSTITUTION:A SETUP message 10 including the sub-address information element where the transfer data are set in sent from a transmitting side ISDN terminal (CLG) 1. An ISDN network(NW) 2 determines an incoming call side ISDN terminal (CLD) 3, sends an incoming SETUP message 21, and sends a CALL PROCEEDING message 11 to the CLG 1. In the CLD 3, a data extracting device (DOT) 7 extracts the transfer data from the sub-address information element included in the incoming SETUP message 21, and returns an incoming rejection RELEASE COMPLETE message 22 to the NW 2. By receiving the RELEASE COMPLETE message 22, the NW 2 executes normal releasing processing for the CLG 1. Thus, the establishment of the packet exchanging call or the line exchanging data call can be made unnecessary.

Description

[Detailed description of the invention] [・Industrial application field] The present invention relates to a data transfer method between ISDN terminals.

[Conventional technology]

Conventionally, in this type of data transfer system, data transfer is performed after establishing a node switched call or a circuit switched data call.

[Problem to be solved by the invention]

The conventional data transfer method described above is a method in which data transfer is performed after establishing a packet-no-1 switched call or a circuit-switched data call, so the cost is high when transferring a small amount of data at low speed. There is a drawback.

[Means to solve the problem]

In the data transfer method between ISDN terminals of the present invention, the originating ISDN terminal that performs data transfer uses the subaddress type in the subaddress information element defined in the D channel signaling layer 3, which has been recommended as an international standard, as a user-specific The ISDN terminal on the receiving side receives a call from the ISDN network by setting the data to be actually transferred as a subaddress type and making a call setup request to the ISDN network with the transfer destination as the called party. The present invention is characterized by comprising means for rejecting the incoming call request after extracting the transferred data from the subaddress information element included in the incoming call request when the request is received.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a sequence of call control messages during data transfer in FIG. 1.

In Fig. 1, this embodiment is an ISDN network (hereinafter referred to as NW).
The network consists of a calling side ISDN terminal (hereinafter referred to as CLG) 1 and a receiving side ISDN terminal (hereinafter referred to as CLD) 3, which transfer data via 2. CLGl is a D channel signal processing device (hereinafter referred to as PRC) 6 connected to NW2, and a data input terminal 4.
The CLD 3 is equipped with a data insertion device (hereinafter referred to as DIN) 5 that inserts input data from the NW 2 and sends it to the PRC 6, and the CLD 3 receives input data transferred from the PRC 6 connected to the NW 2 and the called subaddress information included in the incoming call request received by the PRC 6. A data extraction device (
(hereinafter referred to as DOT) 7.

When the data transfer destination and transfer data input from data input terminal 4 in CLGI are sent to DIN5, DI
N5 sets transfer data in the user-specific subaddress type (calling subaddress, called subaddress, or both subaddresses) information element, and sends it to NW2 via PRC6.
A request is made to place a circuit-switched call to the data transfer destination. P
RC6 sends a call request message including a subaddress information element in which transfer data is set to NW2. NW2
transparently forwards this subaddress information to the destination.

When CLD3 receives an incoming message containing subaddress information from NW2, this incoming message is sent to PRC6.
is transferred to DOT7 via.

The DOT 7 extracts the transfer data set in the subaddress information element and sends it to the data output terminal 8, and then returns an incoming call rejection message to the NW 2 via the PRC 6. This enables low-speed, small-volume data transfer.

Next, the sequence of call control messages during data transfer in this embodiment will be explained with reference to FIG.

First, a 5ETUP message 10 containing a subaddress information element in which transfer data is set is sent from the CLGI. NW2 determines CLD3, sends the incoming 5ETUP message 21, and calls CLGl.
Send RROCEEDING message 11. C.L.
At D3, the DOT 7 extracts transfer data from the subaddress information element included in the incoming 5 ETUP message 21 and returns an incoming call rejection RELEASE COMPLETE message 22 to the NW 2. NW2 is this RELEA
By receiving SE COMPLETE message 22, C
Normal release processing (i.e., DISCO
NNECT message 12 sent, RELEASE message 13 received, RELEASE COMPLETE
Send message 14).

〔Effect of the invention〕

゛As explained above, the present invention makes the subaddress type in the subaddress information element defined in the D channel signaling layer 3 recommended as an international standard for the originating ISDN terminal unique to the user, and actually uses the subaddress type as subaddress information. Set the data to be transferred to the callee and set the transfer destination as the called party.
The ISDN terminal on the receiving side is equipped with means for making a call setup request to the SDN network, and upon receiving an incoming call request from the ISDN network, extracts the transferred data from the subaddress information element included in this incoming call request, and then processes the incoming call. By providing a means to deny requests, there is no need to establish packet-switched calls or circuit-switched data calls, and data transfer can be performed with a simple configuration, minimizing data transfer costs when transferring low-speed, small amounts of data. This has the effect of being able to limit

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a sequence of call control messages during data transfer in FIG. 1. 1...Heating side I SDN terminal (CLG), 2...I
SDN network (NW), 3... Called side I SDN terminal (
CLD), 4...Data input terminal, 5...Data insertion device (DIN), 6...D channel signal processing device (PRC), 7...Data extraction device (DOT),
8...Data output terminal, 10...Outgoing 5ETUP message, 11...CALL RROCEEDING message, 12...DISCONNECT message, 13...RELEASE message, 14...R
ELEASE COMPLETE message, 21...
・Incoming call 5 ETUP message, 22...Reject call RE
LEASE COMPLETE message.

Claims (1)

[Claims] The originating ISDN terminal that transfers data sets the subaddress type in the subaddress information element defined in the D channel signaling layer 3 recommended as an international standard as user-specific, and sets the data to be actually transferred as subaddress information. means for making a call setup request to the ISDN network with the transfer destination as the called party, and the receiving ISDN terminal receives the data transferred from the subaddress information element included in the call request when receiving the call request from the ISDN network. A data transfer system between ISDN terminals, characterized in that the system comprises means for rejecting the incoming call request after extracting the incoming call request.