JP2875331B2 - Communication method in ISDN - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a comprehensive service digital system that integrates various media such as voice and data in a single network and enables high-speed and high-quality communication. The communication network, ie ISDN (Integrat
ed Services Digital Network).

(Prior art) Conventionally, techniques in such a field include those described in Technical Reference Materials, 3 , Telecommunications Association, and “INS Network Service Interface”. Hereinafter, description will be made with reference to the drawings.

FIG. 2 is a diagram showing a conventional first layer 3 message sequence in the case where a terminal having the same terminal attribute as that of the transmitting side is not connected to the receiving side.

As shown in this figure, for example, a G4FAX1 is connected as a calling terminal to a calling side and a plurality of telephones 2, 3, and 4 are connected as called terminals to a called side via an ISDN network (hereinafter simply referred to as a network). . Here, when calling without knowing that the G4FAX is not connected to the called side, first, a call setting message is sent from the calling side to the network, and the G4FAX is transmitted in the higher layer compatibility information element in the call setting message. It is specified.
The higher layer compatibility information element is an information element for designating a service type such as telephone, facsimile machine, telex and the like.

In response to this, a call setting acceptance message is returned from the network to the calling terminal. Subsequently, a call setup message is sent from the network to the called side, and G4FAX is specified in the higher layer compatibility information element therein. Each terminal on the receiving side verifies the higher layer compatibility information element in the call setup message received from the network, and ignores the call setup message if different from its own terminal.

In the network, a response from the called side to the call setup message is monitored for a fixed time using a timer. However, when the timer times out, the receiving side is determined to have no response. Then, from the network to the calling terminal
A disconnect message with a reason information element indicating that G4FAX does not exist is sent, and the call setup is not established.

FIG. 3 shows a conventional second layer 3 when a plurality of terminals having the same terminal attribute as the transmitting side are connected to the receiving side.
FIG. 4 shows a message sequence.

As shown in this figure, for example, a telephone 10 is connected to a calling side as a calling terminal via a network, and a telephone 11, a G4 FAX 12 and a telephone 13 are connected to a called side as called terminals. Here, when calling a specific telephone 13 out of a plurality of telephones on the receiving side, first, a call setting message is sent from the calling terminal to the network, and in response to the call setting message from the network to the calling terminal. After the message is sent, a call setup message is sent from the network to each terminal on the receiving side. At this time, the information element indicating the terminal attribute in the call setting message is verified in each of the receiving-side terminals, namely, the telephone 11, the G4FAX 12, and the telephone 13, and the terminals having different terminal attributes ignore the call setting message, and The call message is all returned from the terminal having the terminal attribute to the network. Thereafter, the terminal that responded first becomes the terminating terminal, and a response message is returned to the network. Subsequently, a response confirmation message is transmitted from the network to the telephone 13 which has transmitted the response message, and a release message is transmitted to the other terminals having the same terminal attribute. The terminal that has received the release message returns a release completion message to the network, and the calling terminal enters the busy mode with only the telephone 13 that has sent the response message.

FIG. 4 is a diagram showing a conventional third layer 3 message sequence in the case where the originating side knows in advance the terminal attribute and subaddress in addition to the station number of the receiving side.

As shown in this figure, for example, a telephone 20 is connected as a calling terminal to a calling side via a network, and a telephone 21, a G4FAX 22 and a telephone 23 each having a subaddress a, b, and c are respectively connected to the called side as a receiving terminal. Have been. The subaddress is address data added after the station number when the calling party communicates with a specific terminal.

Here, when calling the telephone 21 which is a specific terminal among the plurality of terminals on the receiving side, first, a call setup message in which a subaddress a is added after the station number is transmitted to the network. After the network returns a call setup acceptance message to the caller,
A call setup message to which the subaddress a is added is transmitted to each terminal on the receiving side. In each of the receiving-side terminals, telephone 21, G4FAX22 and telephone 23, it is checked whether or not the subaddress a in the call setting message matches the subaddress of the own terminal, and if not, the call setting message Is ignored, and if they match, a call message is returned to the network. The terminal that has transmitted the call message transmits a response message to the network by responding, and the telephone 20 of the calling terminal enters a communication mode with the telephone 21 that is the desired called terminal.

(Problems to be Solved by the Invention) However, the above communication method has the following problems when the calling side calls the called side.

(1) If a terminal having the same attribute as the originating side is not connected to the receiving side as shown in FIG. 2 and the originating side does not know it, a useless call setting will be performed, and as a result, the exchange The load on the caller increases, or causes the transmitting side to perform useless operations.

(2) As shown in FIG. 3, even if the originating side knows that the receiving side terminal has the same terminal attribute as its own terminal, but does not know the sub-address, the terminal that responds earliest is located. If the terminal is not the one desired by the department, the same problem as described above occurs.

(3) In the case of FIG. 4, the calling side knows the receiving side terminal and the sub-address and can communicate with the desired receiving terminal without waste. However, in order to know the terminal attribute and the sub-address in advance, the telephone network or There is only a method of using non-ISDN such as postal mail, and extra expenses and time other than ISDN use are separately generated.

An object of the present invention is to provide a communication method in ISDN which solves the problems of the prior art, such as an increase in the load on an exchange, an unnecessary operation, an increase in cost and time.

(Means for Solving the Problems) In order to solve the above problems, the present invention relates to a communication method in ISDN, wherein user / user information having user information in a call setup message having a higher layer compatibility information element indicating a terminal attribute is provided. Call setting message setting processing for adding a user-user information element and a protocol identifier of the call setting message to a user-specific protocol, and setting the user information to the terminal attribute and sub-address request, respectively, and a call setting accepting message. A user-user information element, a higher-layer compatibility information element, a lower-layer compatibility information element, and a sub-address information element, and the user-user information element and the protocol identifier of the call setting acceptance message into a user-specific protocol. The user information is sent to the terminal attribute, sub-address notification and Respectively a call proceeding message confirmation process of setting information, performed in advance. Then, a polling call process for transmitting the call setting message to a plurality of receiving terminals from the calling terminal to the plurality of receiving terminals by polling transmission, and in each incoming call, confirming that the call setting message was called by the polling transmission. After decoding at the terminal, a polling response process for sending the call setting acceptance message from the respective receiving terminals to the transmitting terminal via the network by polling transmission,
When the originating terminal receives the first call setting acceptance message sent from each of the terminating terminals, it starts time monitoring means, and after the lapse of time for ensuring that all the call setting acceptance messages are received, the time monitoring is performed. A time monitoring control process for overflowing the means, and when the time monitoring means overflows, sending a disconnection message to the network and receiving a release message from the network, and then sending a release completion message to the network to poll the calling terminal. At the same time as terminating the transmission, the network sends the disconnection message to each of the receiving terminals and receives a release message from each of the receiving terminals, and then sends a release completion message to each of the receiving terminals to perform polling transmission of the receiving terminal. The polling transmission termination process to be terminated is sequentially executed.

(Operation) According to the present invention, since the communication method in ISDN is configured as described above, the call setting message determination processing and the call setting reception message determination processing are performed in advance, and the polling call processing, the polling response processing, and the time monitoring are performed. The sequential execution of the control process and the polling transmission end process means that the terminal attribute and the sub-address are polled and transmitted, and the terminal attribute, the sub-address of the specific terminal to be communicated in advance, and the attached information (department) corresponding to the sub-address are transmitted to the calling terminal Work to be.

 Therefore, the above problem can be solved.

(Embodiment) FIG. 1 is a layer 3 message sequence diagram for explaining a communication method in ISDN showing an embodiment of the present invention, and FIGS. 5 (a) and (b) are diagrams in FIG. It is a figure which shows the example of a structure of a call setting message and a call setting acceptance message, and FIG. (A) shows the example of a structure of a call setting message, and (b) of FIG. In addition,
Each message in Fig. 1 and the components in Fig. 5 are CCIT
According to the recommendation of T (International Telegraph and Telephone Advisory Committee).

In FIG. 1, a transmitting terminal 50 is connected to the oscillation side,
A plurality of receiving terminals TE1, TE2 to TEn are connected to the receiving side via a network.

In FIG. 5 (a), the required transmission capacity, call number,
A call setup message for designating a channel or the like desired to use has a common unit 100 and an individual unit 110. The common unit 100 includes a protocol identifier 101 for identifying a protocol that is a protocol and a protocol for performing data communication, a call number 102 and a message type (call setting message) 103. A user / user information element 111 having 111a and user information 111b which is free information (terminal attributes and the like) of the user is provided.

As shown in FIG. 5 (b), similarly to the above, the call setting reception message for confirming the reception of the call setting message and indicating the channel to be used to the calling side is transmitted to the common unit 120.
And an individual unit 130. The common unit 120 includes a protocol identifier 121, a call number 122, and a message type (call setting acceptance message) 123. In the individual unit 130, the user / user information element 124 includes a protocol identifier 124a and user information 124b. Is provided.

The communication method in ISDN will be described with reference to FIGS.

First, as shown in FIGS. 5 (a) and 5 (b), the following processing is performed to compose the call setting message and the call setting accepting message used in FIG.

The user having the user information 111b in the call setup message
A user information element 111 is added, and the user / user information element 111 and the protocol identifier 101 of the call setup message are added to the user-specific protocol (00H), and the user information 111b is added.
Together with a call setup message determination process for setting a terminal attribute and a subaddress request respectively, a user / user information element 124, a lower layer compatibility information element 125, a higher layer compatibility information element 126, and a subaddress information element 127 in the call setup acceptance message. Add the user / user information element 1
24 and the protocol identifier 111a of the call setting acceptance message as a user-specific protocol (OOH),
Is set in advance in the terminal attribute, the sub-address notification, and the attached information.

Subsequently, the calling terminal 50 and each of the receiving terminals TE1, TE2 to TEn are determined in advance.
In order to send the terminal attributes and subaddresses of all the terminals TE1, TE2 to TEn connected to the called side to the calling side by using the polling transmission function provided respectively for the calling side, the following processing is performed.

First, the mode of the calling terminal 50 is set to polling transmission,
A polling call process is performed in which the call setting message is transmitted from the calling terminal 50 to each of the receiving terminals TE1, TE2 to TEn by polling transmission via the network (step 51). At the terminating terminals TE1, TE2 to TEn, after the call setting message is decoded by polling transmission, the call setting acceptance message is transmitted from the terminating terminals TE1, TE2 to TEn via the network. A polling response process to be transmitted to the terminal 50 by polling transmission is performed.

The calling terminal 50 receives a call setting message from each of the receiving terminals TE1, TE2 to TEn, and collects terminal attributes and subaddresses of the receiving terminals TE1, TE2 to TEn using a memory such as a RAM (random access memory). .

The calling terminal 50 has a built-in timer as time monitoring means, and starts the timer when receiving the first call setting acceptance message sent from each of the terminating terminals TE1, TE2 to TEn (step 52). A time monitoring control process is performed so that the timer overflows with a time that guarantees that all messages are received (step 53).
Considering that up to eight terminals TE1, TE2 to TEn can be connected to all terminals on the receiving side, the timer setting time is set to eight terminals.
This is set to the time until all of TE1, TE2 to TEn have completed transmitting the call setting acceptance message.

Subsequently, when a disconnection message notifying the disconnection request is sent to the network when the timer overflows and a release message is received from the network, a release complete message is transmitted to the network to terminate the polling transmission of the calling terminal 50, and
After the network sends a disconnection message to each of the terminating terminals TE1, TE2 to TEn and receives a release message from each of the terminating terminals TE1, TE2 to TEn, it sends a release completion message to each of the terminating terminals TE1, TE2 to TEn. Perform polling transmission end processing for terminating polling transmission on the receiving side.

In this way, the originating terminal 50 is transmitted using polling transmission.
The terminal attributes and sub-addresses collected in are registered in the telephone directory in the calling terminal 50. Next, when a call is made in the normal call mode, the terminal attributes are checked with reference to the telephone directory, and a call is made with the subaddress of the desired partner terminal added.

 This embodiment has the following advantages.

(1) By polling the terminal attribute and the sub-address using the polling transmission function, the terminal attribute, the sub-address, and the additional information (department) corresponding to the sub-address to be communicated in advance can be known. It is possible to set up a call directly to a desired terminal, and it is possible to prevent an unnecessary increase in the exchange load and unnecessary call setting of the terminal.

(2) Since the polling method does not enter the call mode, no call fee is charged.

(3) By storing, in the memory of the transmitting terminal 50, all terminal attributes, sub-addresses, and auxiliary information (departments) corresponding to the sub-addresses of the receiving terminal group obtained by the above method, the following another characteristic is obtained. It is possible to immediately communicate with the terminal in a so-called calling mode.

(4) In a single user network interface, the number of terminals, attributes, and subaddresses that change irregularly can be arbitrarily known by the intention of the transmitting side.

Note that the present invention is not limited to the illustrated embodiment, and various modifications are possible. As a modification, for example, in the above-described embodiment, a timer is used as the time monitoring means. However, the present invention is not limited to this. For example, a counter, a delay circuit, or the like may be used.

(Effects of the Invention) As described above in detail, according to the present invention, the call setting message determination processing and the call setting acceptance message determination processing are performed in advance, and the polling call processing, the polling response processing, and the time monitoring control processing are performed. And the polling transmission end processing are sequentially executed, so that useless call setting is not performed, so that the load on the exchange is increased and the calling side is prevented from being uselessly operated.

Furthermore, there is no need to use any other means than the ISDN, such as a telephone network or mail, to notify the calling party of the sub-address, thereby saving cost and time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a layer 3 message sequence showing an embodiment of the present invention, FIG. 2 is a diagram showing a conventional first layer 3 message sequence, and FIG. 3 is a diagram showing a conventional second layer 3 message.
FIG. 4 shows a message sequence, and FIG.
5 (a) and 5 (b) are diagrams showing a configuration example of a call setup message and a call setup acceptance message in FIG. 1, and FIG. 5 (a) is a diagram showing a call setup message. FIG. 3B is a diagram showing a configuration example of a setting message and FIG. 50: originating terminal, 101, 111a, 121, 124a: protocol identifier, 111, 124: user / user information element, 111b, 124b
…… User information, 125 …… Lower layer compatibility information element, 1
26: Higher layer compatibility information element, 127: Subaddress information element, TE1, TE2 to TEn: Terminating terminal.

Continuation of front page (72) Inventor Masaaki Hashi 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-3-11857 (JP, A) JP JP-A-2-218247 (JP, A) JP-A-3-243044 (JP, A) JP-A-3-102947 (JP, A) JP-A-3-23733 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) H04L 29/00

Claims (1)

(57) [Claims] 1. A user / user information element having user information is added to a call setup message having a higher layer compatibility information element indicating a terminal attribute, and a protocol identifier of the user / user information element and the protocol identifier of the call setup message are assigned to the user. A call setup message determination process for setting the user information in the terminal attribute and the subaddress request in a specific protocol; and a user / user information element, a higher layer compatibility information element, a lower layer compatibility information element and A call setting acceptance message for adding a sub address information element, setting the user / user information element and the protocol identifier of the call setting acceptance message to a user specific protocol, and setting the user information to the terminal attribute, sub address notification, and auxiliary information, respectively. Processing is performed in advance, and the A polling call process for sending the call setting message to a plurality of receiving terminals by polling transmission via an ISDN network; and in each receiving terminal decoding that the call setting message is a call originating from the polling transmission. Then, a polling response process of transmitting the call setting acceptance message from the respective receiving terminals to the transmitting terminal by polling transmission via the ISDN network, and the first call setting transmitted by the transmitting terminal from the respective receiving terminals. A time monitoring control process for starting the time monitoring means when the reception message is received and overflowing the time monitoring means when all the call setting reception messages are received, and a disconnection message to the ISDN network when the time monitoring means overflows. After sending and receiving the release message from the ISDN network, release to the ISDN network is completed. A message is sent to end the polling transmission of the calling terminal, and after the ISDN network sends the disconnection message to each of the called terminals and receives a release message from each of the called terminals, release to each of the called terminals is completed. And a polling transmission termination process for terminating the polling transmission of the receiving terminal by transmitting a message.