JPH04151950A - Isdn incoming call transfer control system - Google Patents

Abstract

PURPOSE:To simplify the protocol by storing a transfer sender subscriber number to a built-in memory at a transfer destination terminal equipment and checking its own subscriber number in a message and a transfer sender subscriber number when the message is received from an ISDN network. CONSTITUTION:A call control section 2 commands the revision of content in a call setting message 7 to a basic protocol control section 3. That is, an incoming number in the content of a setup message in a call setting message memory 7 is revised into a transfer destination subscriber number read from a transfer memory 6 and a caller number into its own subscriber number respectively and the caller number is used as user-user information to command the transmission. A terminal equipment C receives a setup message from a terminal equipment B via an ISDN network 8, a protocol control section 3 sends a call message to the ISDN network 8, the call control section 2 confirms it and stores a call setting message to the memory 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a call transfer control system in an ISDN communication terminal.

[Prior art 1] Fig. 4 shows, for example, a conventional call transfer function described in "51 Call forwarding function" of [Technical Reference Material INS Net Service Interface, 4th Molecule fll- (Layer 3 Circuit Switching Additional Service N)]. This relates to the functional block configuration for realizing the control method.

In the figure, (1) is a man-machine interface section,
(2) is a call control unit that manages the entire call control, and (3) is a Q
, 931 to control the basic protocol compliant with 931.
1 basic protocol control unit (hereinafter abbreviated as basic protocol control unit), (4) is an additional service protocol control unit that controls protocols related to additional services that are not controlled by basic protocol control unit (3), and (5) is a line control unit. A line control unit manages synchronization, etc., (6) is a transfer memory for storing contents necessary for transferring destination subscriber numbers, etc., and (8) is an ISDN network.

Next, the operation will be explained.

FIG. 3 shows a call control sequence when terminal B also sets up a call to terminal A and transfers the main call from terminal A to terminal C.

However, although terminal A and terminal C are equipped with the functional blocks shown in FIG. 4, terminal B is assumed to have at least an I5I)N network connection function.

First, at terminal A, when the user inputs a transfer instruction and the number given to terminal C as the transfer destination subscriber number from the man-machine interface section (1), the call control section (
2) stores the transfer destination subscriber number in the transfer memory (6).

Terminal A receives audio 3 from terminal B via the ISDN network (8).
．． Upon receiving the 5ETUP message for either 1kHz audio or [14kb/s unrestricted bearer service, the basic protocol control unit (3) transmits the ISDN network (8)
CALL PROC as the first response message.
: Sends a message and notifies the call control unit (2) of the incoming call. When the call control unit (2) makes a transfer request to the supplementary service protocol control unit (4),
The service protocol control unit (4) has a transfer memory (6).
), calls the transfer destination subscriber number, sets it in the key bat facility information (hereinafter abbreviated as KP), and sends an INFO message. ISDN network (8) is from terminal C to A
When the L E RT message is received, it is sent to terminal B.
When it receives the C0NN message, it sends it to terminal B, and notifies terminal A of the status.
After transmitting the C0NN ACK message to terminal A, the status is notified to terminal A, and communication between terminal B and terminal Cnfl becomes possible.

The communication charges at this point are calculated assuming that communication is taking the route Terminal B - Terminal A - Terminal C. Between terminal B and terminal A, charges are charged to terminal B, and between terminal C and terminal C, charges are charged to the terminal. be done.

Problem 1 to be Solved by the Invention C Since the conventional terminal call setup method is configured as described above, in order to receive the calling service, a module for controlling the calling service protocol is required, and a module for controlling the calling service protocol is required. - Despite communication between the transfer destination terminals, communication charges are charged by the originating terminal between the originating terminal and the transfer source terminal, and by the transfer source terminal between the transfer source terminal and the transfer destination terminal. The problem was that I had to pay for two calls.

This invention was made to solve the above-mentioned problems; it enables call forwarding with a simpler module configuration, reduces communication charges, and does not provide additional call forwarding services. The object of the present invention is to obtain an ISDN call transfer control system that enables transfer in an ISDN network and transfer in any bearer service.

[Means for Solving the Problems] The ISDN call transfer control system according to the present invention includes a transfer source terminal that transfers the call to a default terminal when a call is received from a calling terminal, and a transfer destination terminal to which the call is transferred. The transfer source terminal stores the subscriber number of the transfer destination terminal in its built-in memory, and when receiving a call control message from the originating terminal, sends a message containing the transfer destination subscriber number and its own subscriber number to 1.
The transfer destination terminal is equipped with a call control unit that sends the call to the SDN network, and on the other hand, the transfer destination terminal stores the transfer source subscriber number in a built-in memory, and when receiving a message from the ISDN network, the transfer destination terminal stores the transfer source subscriber number in the message and the own subscriber number in the message. The system is equipped with a call control unit that sends a message to the ISDN network to disconnect the transfer source terminal and to set up a call to the originating terminal when determining a match with the transfer source subscriber number.

[For use] In the ISDN call transfer control system of the present invention, when a terminal receiving a transfer source instruction receives a call control message from a calling terminal, the transfer source terminal transmits a call control message to the transfer destination terminal from where and with what content. In order to notify whether the call has arrived at
A call control message in which the transfer source subscriber number is changed to the called party number is sent to the ISDN network, and the transfer destination terminal receives this message, obtains the originating terminal subscriber number, and makes a call from the transfer destination terminal to the originating terminal. By configuring the settings and forwarding calls, communication between the calling terminal and the forwarding destination terminal becomes possible.

C Example 1 An embodiment of the present invention will be described below.

FIG. 2 shows a functional block configuration for realizing an embodiment of the present invention.

In the same figure, (1) is the man-machine infrastructure section, (
2) is a call control unit that manages the entire call control, and (3) is a 09
(5) is a line control unit that manages line synchronization, etc.;
(6) is a transfer memory for storing the contents necessary for transferring the transfer destination subscriber number, etc.; (7) is a call setting message memory for storing the received call setting message;
) is an ISDN network.

Next, the operation will be explained.

FIG. 1 shows a call control sequence in which a call is set up from terminal B to terminal A, a call is made from terminal A to terminal C, and a call is made from terminal C to terminal B to perform incoming call transfer.

However, although terminal Aj3 and terminal C are equipped with the functional blocks shown in FIG. 2, terminal B is assumed to be equipped with at least an ISDN network connection function.

First, in terminal A, when a user manually inputs the number given to terminal C as a transfer source instruction and transfer destination subscriber number from man-machine interface section (1), call control section (
2) Store the transfer destination subscriber number in the 4j transfer memory (6).

In addition, in terminal C, when the user manually inputs the forwarding destination instruction and the number given to terminal A as the forwarding subscriber number from the man-machine interface section (1), the call control section (
2) stores the transfer source subscriber number in the transfer memory (6).

Terminal A receives 5ET from terminal B via ISDN network (8)
Upon receiving the UP message ■, the basic protocol control unit (3) transmits the CALI and PROC messages to ISDNl+2] (8) as the first response message, and notifies the call control unit (2) of the incoming call. After notifying the user of this, the 5ETUP message ■ is stored in the call setting message memory (7).

The call control unit (2) transmits the contents of the 5ETUP message ■ in the call setting message memory (7) to the basic protocol 1 to the protocol control unit (3) according to the transfer source instruction, and the called number is stored in the transfer memory. Change the forwarding subscriber number read from (6) and the calling number to the own subscriber number, and
Instructs to send a 5ETUP message ■ with the calling number of the TUP message ■ as user information.

Terminal C receives 5ET from terminal B via ISDN network (8).
When the UP message ■ is received, the protocol control unit (
3) sends a CALL PROC message as the first response message to the ISDN network (8), and notifies the call control unit (2) that there is an incoming call.
The TUP message ■ is stored in the call setting message memory (7).

When the call control unit (2) recognizes that the calling number of the 5ETUP message ■ in the call setting message memory (7) is the same as the number stored in the transfer memory (6), it performs basic protocol control gfl (3). In response, a DISC message ■ which is a disconnection message of the 5ETUP message ■ is transmitted.

Upon receiving the DISC: message ■, the call control unit (2) of the terminal A determines that the transfer destination terminal has received the call transfer, and sends the DI, which is the disconnection message of the 5ETUP message ■.
After transmitting the SC message ■ and disconnecting/releasing communication between terminal B and terminal A, communication between terminal C and terminal Δ is also released.

The call control unit (2) of terminal C transmits the contents of the 5ETUP message ■ in the call setting message memory (7) to the basic protocol control unit (3) according to the previous transfer destination instruction, and the called party number is the content of the 5ETUP message ■. The numbers in the user-to-user information are changed, the calling number is changed to the own subscriber number, and the user-to-user information is instructed to send a 5ETUP message (2) in which the forwarding destination instruction and the forwarding source number are added.

This enables communication between terminal B and terminal C.

In the above embodiment, the first response message to the incoming call from the terminal that has received the forwarding source instruction is CAL LPRO.
Although the example in which the C message is sent is shown, other response messages may be sent, or the call may be released without responding.

In addition, although the transfer destination instruction is input by the user at the transfer destination terminal, if the transfer destination instruction and the transfer source subscriber number can be set on the terminal, the call control message from the transfer source It is also possible to use the procedure according to

[Effects of the Invention] As described above, according to the present invention, when a terminal that has received a transfer source instruction receives a call control message from a calling terminal, it sends a message containing a transfer destination subscriber number and its own subscriber number to the ISDN network. The transfer destination terminal stores a transfer source subscriber number in a built-in memory, and when receiving a message from the ISDN network, the transfer destination terminal stores the transfer source subscriber number in the message and the transfer source subscriber number in the message. When a match is determined with the party number, a message is sent to the ISDN network to notify the transfer source terminal of the communication disconnection and to set up a call for the originating terminal.This simplifies the module that controls the additional service protocol. In addition, communication charges are charged between the originating terminal and the transfer destination terminal, making it inexpensive, and there is also the effect that call setup by any pair service can be transferred.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a call control sequence using an ISDN call transfer control method according to an embodiment of the present invention, FIG. 2 is a diagram showing a functional block configuration according to an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional ISDN FIG. 4 is a diagram showing a call control sequence in the call transfer control method, and FIG. 4 is a diagram showing a functional block configuration according to the conventional method. (1) is a man-machine interface section, (2) is a call control section that manages the entire call control, (3) Ll:Q, 931
(4) is an additional service protocol control unit that controls protocols related to additional services that are not controlled by the basic protocol control unit (3); (5) is an additional service protocol control unit that manages line synchronization, etc. (6) is a transfer memory for storing the contents necessary for transfer such as the transfer destination subscriber number;
7) is a call setting message memory for storing received call setting messages, and (8) is an ISDN network.

Claims (1)

[Claims] When a call is received from the originating terminal, the transfer source terminal that transfers the call to the default terminal and the transfer destination terminal to which the call will be transferred are set, and the transfer source terminal adds the transfer destination terminal to its built-in memory. a call control unit that stores a subscriber number and sends a message including a transfer destination subscriber number and own subscriber number to the ISDN network when receiving a call control message from a calling terminal, while the transfer destination terminal has a built-in When a message is received from the ISDN network, and when it is determined that the own subscriber number in the message and the transfer source subscriber number match, the transfer source terminal is notified of communication disconnection. An ISDN call transfer control system characterized by comprising a call control unit that sends a message for setting up a call to a terminal to an ISDN network.