JPH0687571B2 - Communication terminal incoming response method - Google Patents

Description

The present invention relates to a communication terminal connected to a communication network, and in particular to CC
The present invention relates to a response method for an incoming call of a communication terminal having an interface that conforms to the ITT (International Telephone Advisory Committee) I. series recommendation.

[Conventional technology]

CCITT named the network that provides digital communication services the Digital Integrated Services Network (ISDN), and at the end of 1984, recommended by the I. Series (Red boo
k) was performed. I.451 Recommendation (CCITT Red book Vol.II
According to I, Fascicle III.5), in response to an incoming message (SETUP) from the communication network, the communication terminal compares the value of its own attribute with the value of the service attribute of the incoming call in the above incoming message. The communication terminal decides whether or not to respond to this incoming call, and returns a response message (CONN) to the communication network only when it responds.

Specifically, the method is as follows.

The message sent from the communication network to the communication terminal for call connection is called the SETUP message, and this message contains the protocol identifier, call number, message type, transmission capability,
Channel identifier, progress identifier, terminal function, display, keypad, signal, switch hook, calling number, calling subaddress, called number, called subaddress, transit network selection, low layer compatibility, high layer compatibility and user user Contains various information elements (CCITT Q.931). Among these information elements, the compatibility check as to whether or not the communication terminal may receive the communication terminal itself is used by the communication capability, the lower layer compatibility, the higher layer compatibility, and the user / user. In addition, it may be omitted except for the transmission ability. The communication terminal holds, in advance, a classification table of items that can be received by the own terminal and its items, that is, attributes and their values, with respect to the contents of the above information elements,
The held information is compared with the contents of the newly arrived incoming call message to determine whether or not the incoming call is possible.

Referring to FIG. 6, a certain home device 20 accommodated in the communication network 10 is now provided with a point / multipoint bus 22 connected via a network terminator (NT) 21. Communication terminal (TE) 23, 24, 25,… 2n
, 2n share one subscriber number and do not have a sub-address.

[Problems to be solved by the invention]

In the case of the conventional incoming call answering method according to I.451 recommendation,
As shown in the figure, these communication terminals 23, 24, 2 from the communication network 10
When the SETUP message is sent to 5, 5, and 2n in a single-feed format, a plurality of communication terminals 23 to 2n, for example, communication terminal 23
When 25 and 25 determine that they can answer the incoming call, each of them returns the response message (CONN) to the communication network 10. The communication network 10 side returns a response confirmation message to the communication terminal 23 that first returned the response message (CONN) to formally receive the call, and does not allow the other communication terminals 25 to receive the call. ing.

Therefore, if there is a communication terminal that is always quicker to send back a response message than other communication terminals, the call is always sent to this communication terminal. However, there is a problem that even if the call is repeated, it may not be possible to communicate with the desired partner communication terminal.

An object of the present invention is to provide a communication terminal incoming call response system capable of surely executing communication with a desired partner communication terminal.

[Means for solving problems]

The communication terminal incoming call answering system of the present invention comprises a plurality of communication terminals having the same subscriber number, and when each communication terminal has received a call, but the person who really wants to talk is not himself,
Means for storing the caller's number, the attribute value of the incoming call,
After that, a means for delaying the timing of sending a response message to an incoming call having the same caller number and incoming call attribute value is provided.

〔Example〕

Referring to FIG. 1, a terminal device (TE) to which the present invention is applied
Reference numeral 30 denotes a layer 1 controller for matching the interface for physical connection and electrically controlling for bit transmission, and a layer 2 controller for controlling whether the link can be normally used, for example, error detection, parity check, etc. A second processing unit 31 including a first processing unit 31, a state display information processing such as calling, a response, and a disconnection, and a layer 3 processing such as dial enable, progress display, selection control information processing such as dialed digits, communication class, etc. The processing unit 32 includes an incoming call response addition processing unit 33, which will be described in detail later, and a user application unit 34 such as a user application and an operation / maintenance application.

Referring to FIG. 2, the incoming call response addition processing section 33 has a signaling section 41, a register section 42 and a timing generation section 43.

The signaling unit 41 includes signaling input / output terminals SG (SGI, SG
O) to the signaling of the digital access signaling system of the communication network, and also to the user application section 34 in the communication terminal via the application terminals AP (AP1, AP2). Further, it is connected to the count end terminal TCE of the timing generator 43 via the count end terminal SCE. The timing generator 43 is connected to the count start terminal SCS of the signaling unit 51 via the count start terminal TCS, and the register unit 4 via the control input terminal CI.
Connected to control output terminal CO of 2. The register section 42 is connected to the user / application section 44 via the status input terminal ST, and is connected to the number information output terminal SAD of the signaling section 41 via the number information input terminal RAD.

The contents of each block will be described in more detail below.

The signaling input terminal SGI in the signaling unit 41 has S
The ETUP message content verification unit (SMC) 411 is connected, and the result is output from the count start terminal SCS. Also, the calling number and attribute extraction unit (ON
C) 412 is connected and its output is the number information output terminal SAD
Is output from. Further, the signaling input terminal SGI is connected to the application terminal AP1. On the other hand, in the signaling unit 41, the input terminal C of the CONN message transmission delay unit (RDC) 413 is connected to the count end terminal SCE. Also, the input terminal A of RDC413 is the application terminal AP2.
In addition, the output terminal B of RDC413 is the signaling output terminal SG.
Connected to O. The register unit 42 includes a storage unit (MEM) 421 and a registration instruction / waiting number subtraction unit (RS) 422. The number information input terminal RAD is connected to the input MI of the MEM421,
The status input terminal ST is connected to the input terminal RSI of RS422.
The output terminal RSO of the RS422 is the control input terminal MC of the MEM421.
Connected to. Further, the output terminal MO of the MEM421 is connected to the output terminal CO of the register unit 42.

Next, with reference to FIG. 2 together with FIG. 3 and FIG. 4, an incoming call response operation of one communication terminal will be described. The other communication terminals also perform the same operation.

The SETUP message from the communication network is input to the signaling unit 41 from the signaling input terminal SGI of the communication terminal.
The message content is from the application terminal AP1
The user application unit 44 (third part in the communication terminal)
(Fig.) Will be notified. At the same time, the signaling unit 41 changes the SMC4
When it is determined that the SETUP message has been received according to 11,
The count start terminal SCS instructs the count start terminal TCS of the timing section 43 to start counting (step 1 in FIG. 7). This is the time A in FIG. 4, that is, the SETUP message reception time. In addition, the signaling unit 41 is ONC5
12 From the SETUP message above, the sender's number,
The attribute value of the call is taken out and output from the number information output terminal SAD to the number information input terminal RAD of the register section 52.

The user application unit 34 in the communication terminal analyzes the content of the SETUP message and performs compatibility check, that is, "transmitting capability" and, if necessary,
The contents of the information elements "low layer compatibility", "high layer compatibility", and "user / user" are compared with those of the own terminal (step 2). When the user application unit 34 determines that the call can be received (step 3), it instructs the AP2 of the signaling unit 41 to respond.

On the other hand, the MEM 421 of the register unit 42 inputs the caller's number and the call attribute value in the current incoming call message extracted by the ONC 412 from the MI, and sends the call to the communication terminal when the previous incoming call is completed. The number of the caller and the attribute value of the call are compared with each other, and it is checked whether or not the same caller has previously made an erroneous call with the same content (step 4). As a result of the check, it is determined that it is an erroneous incoming call, and the fact that the communication was unsuccessful at the time of the last incoming call is notified from the user application unit 34 in the communication terminal to the RS422 via the status input terminal ST, Only when the output is input to the MC of MEM421 is the MO of MEM421
Supplies the waiting time setting signal n to the CI of the timing unit 43 via the control output terminal CO. This waiting time setting signal n
Is incremented by +1 each time an incoming call message having the same caller number and call attribute value arrives, and is reset to zero when the incoming call is truly completed to the communication terminal.

When the waiting time setting signal n from the register unit 42 does not come, that is, when the timing unit 43 is zero, the timing unit 43 immediately outputs the count end signal from the count end terminal TCE to the SCE of the signaling unit 41.

The RDC 413 of the signaling unit 41 sends a response signal from the user application unit 34 in the communication terminal to the terminal A2 at the terminal AP2.
From the output terminal B to the communication network side via the signaling output terminal SGO, when the input terminal C receives the count end signal from the timing unit 53 via the terminal SCE. Step 6). Fourth
The time B shown in the figure is the shortest response possible time, and the time from time A to time B is the shortest response time T _MIN .

Next, assume that the waiting time setting signal n is supplied from the MEM 421 of the register 42 to the CI of the timing unit 43. The timing unit 43 performs the waiting time process (STEP 6) by one of the following two preset methods. The first method is to increase the waiting time T _W each time there is an erroneous call and delay the response until the time T _MAX until the maximum communication network side allows a response. In this method, the process represented by T _W = T _MIN + nΔ≤T _MAX (1) is performed. Here, Δ is a unit time of change in response time. The timing unit 43 performs the counting according to the equation (1) based on the waiting time setting signal n supplied from the MEM 421, and outputs the counting end signal from the counting end terminal TCE to the SCE of the signaling unit 41 after the waiting time T _W.

Further, the second method is a method of setting the waiting time T _W as in the expression (2).

T _W = T _MAX −n · Δ (2) When the timing unit 43 receives the waiting time setting signal n, the fourth
At the time when the time from the count start time A shown in the figure becomes the above expression (2), for example, at the time D, the count end terminal TCE outputs the count end signal to the SCE of the signaling unit 41.

The RDC 413 of the signaling unit 41 communicates from the output terminal B when the response instruction from the user application unit 44 in the communication terminal and the count end signal from the timing unit 53 from the timing unit 53 are input to the input terminal A and the input terminal C, respectively. The response message CONN is returned to the network side via the signaling output terminal SGO (step 6).

As a result, when the call is received for the first time, T _MIN
When a response message is returned at the time of, and the call is not addressed to itself, even if the calling side makes a call again with the same attribute value instructed, the response message to this is delayed. If there is another communication terminal returning the response message, the incoming call to this communication terminal is completed.

Referring to FIG. 5, the process after the start of communication is performed as follows. First, communication with the other party starts (step 11)
After that, it is checked whether the communication is normal (step
12). If the communication is normal, the communication is continued. On the other hand, at the start of communication, the other party number, attribute, etc. extracted from the ONC412 at that time are input to the MEM421 as described above.
It is registered in the MEM421 according to an instruction input from the application unit 34 (FIG. 1) via ST (step 1
3). Further, the user application 34 gives the second processing unit 32 (FIG. 1) an instruction to send a DISCONN message for releasing the path. The second processing device 32 and the first processing device 31 perform the processes of layers 1 to 3 and send a DISCONN message, and the path is released.

〔The invention's effect〕

As described above, according to the communication terminal incoming call response method of the present invention, the number of the calling side and the attribute value of the call when the communication is unsuccessful are stored, and for the incoming call message of the same content as this, By delaying the return of the response message from the communication terminal, another communication terminal can complete the incoming call in response to the incoming message.

Further, according to the present invention, by changing the time delaying the return of the response message each time an incoming call message is received, the response message return from a plurality of communication terminals does not occur at the same time, and the message reception on the communication network side does not occur. The times can be distributed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing details of an embodiment of the present invention, and FIG. 3 shows a process at the time of an incoming call in the embodiment of the present invention. A flow chart, FIG. 4 is a response timing chart, FIG. 5 is a flow chart showing processing after the start of communication, FIG. 6 is a view showing an example of a system configuration to which the present invention is applied, and FIG. 7 is a communication network and communication. It is a sequence diagram which shows message transmission / reception with a terminal. 30 …… Terminal, 32 …… Second processing unit, 33 …… Incoming call response addition processing unit, 34 …… User application, 41 ……
Signaling unit, 42 ... Register unit, 43 ... Timing unit, 411 ... SETUP message content verification unit (SMC), 412 ...
... Calling number, attribute extraction unit (ONC), 413 ... CONN message transmission delay unit (RDC), 421 ... storage unit (MEM), 422 ...
Registration instruction and waiting time subtraction unit (RS).

Claims (3)

[Claims] 1. A plurality of communication terminals having the same subscriber number are provided, and each communication terminal receives an incoming call, but if the other party who wants to make a call is not myself,
Means for storing at least the number of the caller and attribute values of the call at the time of incoming call; and means for delaying the timing of sending a response message to an incoming call having the same caller number and incoming call attribute value A communication terminal incoming response method characterized by having. 2. The timing delay means delays the timing of sending a response message for each one of the incoming calls, and delays the time until a response is permitted by the longest communication network side. The communication terminal incoming call response method described in item 1. 3. The timing delay means receives a time obtained by subtracting a time extended from a predetermined time according to the frequency (the frequency is an integer of 1 or more) in which the connection is not completed after the response message is transmitted from the terminal itself. The communication terminal incoming response system according to claim 1, characterized in that the response means is started at a time after a message arrival time.