JP3000644B2 - ISDN communication terminal equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN communication terminal device used by connecting to an integrated services digital network (ISDN).

[Background Art] With the start of ISDN (Integrated Services Digital Network) service, it has become possible to exchange not only voice information but also non-voice digital information with a desired partner device. As is well known, when using ISDN, a call setting request including a dial number (hereinafter, calling number) of a calling side device is given from a network side to a called side device. Taking advantage of this,
An ISDN communication terminal device having an identification reception function for permitting an incoming call only when the calling number in the call setting request matches a dial number registered in advance by the user (hereinafter referred to as an incoming call permitting dial number) Is being developed.

By the way, when a call is made from an area, a calling number including an area code is sent from the network side. There is a possibility that both calling numbers with only the internal number will be sent.

For this reason, as shown in Table 1, when a call setting request is made from a partner in the city to which the call is to be permitted, the number of digits of the call permission dial number and the number of the calling number of the call setting request may be different. . Therefore, in the conventional terminal device, the lower digit part (45-678 in the case of Table 1) existing in both the calling number and the incoming call permitted dial number of the call setting request.
9) was checked to determine whether a call was accepted. In addition, administrative guidance was given to users to register a call-permitting dial number with an area code.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional ISDN communication terminal device, as shown in Table 2 below, when the incoming call permitted dial number is only a local number (45-6789), If a call is received from a partner (for example, dial number 0122-45-6789) having the same local number as the incoming call permission dial number and a different area code, the incoming call should be rejected even though the call should be rejected. There was a problem of permitting.

Conversely, for example, when it is desired to allow only a call from a caller outside the city whose dial number is 0124-45-6789, if only the local number is registered as a call-permitted dial number, the city to which the own device joins can be registered. If the call corresponds to the outside number (0123) and there is an incoming call from the other party with the local number 45-6789, the incoming call is erroneously accepted.

These are very serious problems, especially when the ISDN communication terminal device provides a data supply service by polling, because data is transferred to a party to whom data reception should not be permitted. Become.

The present invention has been made in view of the above-described circumstances, and has as its object to provide an ISDN communication terminal device with enhanced protection against an incoming call from a party that should not be permitted.

[Means for Solving the Problems] A first invention is a dial number storage means for storing a dial number of a partner device to which an incoming call is permitted, and a dial number when a call setting request is received from a network in an identification incoming call mode. The dial number stored in the storage means is taken out as a collation number, and when the number of digits does not match, the upper digits of the dial number of the own device are supplemented to thereby obtain the number of digits of the calling number in the call setting request and the An identification incoming call control means for matching the number of digits of the verification number, permitting the incoming call when both numbers match, and rejecting the incoming call when the numbers do not match. apparatus.

Further, the second invention is a dial number storage means for storing a dial number of a partner device to which a call is permitted, and a dial stored in the dial number storage means when a call setting request is received from the network in the identification reception mode. The number is taken out as a collation number, and when the number of digits of the collation number is equal to or greater than the number of digits of the calling party number in the call setting request, the toll number of the own device is complemented by adding the toll number of the own device. The number of digits of the calling number is made to match the number of digits of the matching number. If both numbers match, the incoming call is permitted. If they do not match, the incoming call is rejected. And an identification control means for rejecting an incoming call when the number is smaller than the number of digits of the calling number in the call setting request.

According to the first and second aspects of the present invention, if the numbers of digits do not match, the number of digits is matched by supplementing the upper digits with the dial number of the own device, and then matched with the calling number. The verification of the service number is performed. Therefore, regardless of whether or not the calling number includes the area code, a normal identification incoming call is performed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an ISDN communication terminal device according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a CPU (central processing unit) for controlling each unit of the apparatus;
Is the RO that stores the control program executed by CPU1
M (read only memory) and 3 are RAMs (random access memories). Each storage area in the RAM 3 is used for control information such as a mode flag, a shortened dial memory table, and the like. Here, the speed dial table contains
The dial numbers of the partner device corresponding to each of the speed dial numbers (for example, 00 to 99) input by the user in advance are stored. In this ISDN communication terminal device, incoming call control is performed in the identification incoming call mode so as to permit only incoming calls from the partner device whose speed dial number has been registered.

4 is a line control unit for controlling the line connection with the partner device, 5
Is a communication control unit that performs control for establishing a data link and controls transmission and reception of signals. Reference numeral 3 denotes a peripheral device control unit that controls transmission and reception of data to and from a peripheral device connected to the terminal device. 6 is a telephone function unit, and a receiver
6a is connected, and controls transmission and reception of voice information in the receiver 6a. An operation control unit 7 detects operations of various operation buttons provided on an operation panel of the apparatus and controls display of an LCD (liquid crystal display) (not shown) provided on the operation panel.

Hereinafter, the operation of the ISDN communication terminal device will be described. When a call setting request from the network is received by the line controller 4, the calling number NID in the call setting request is taken into the CPU 1, and the CPU 1 executes a routine whose flow is shown in FIG. First, the process proceeds to step S1, where it is determined whether the setting mode is the identification incoming mode. This judgment result is "NO"
In step S2, the flow advances to step S2 to send an incoming call permission command to the line control unit 5 and establish a line connection with the partner device.

On the other hand, if the setting mode is the
The determination result of S1 becomes "YES" and the process proceeds to step S2, where the RAM
The incoming call permitted dial number is read from the speed dial memory table in 2 and taken in as the collation number TID. Then, the process proceeds to step S4, where the number of digits of the collation number TID and the calling number N
Compare the number of digits of the ID.

If the number of digits of the calling number NID is insufficient for the number of digits of the verification number TID, the process proceeds to step S5, and the own address SID
(The dialing number with the area code of this terminal device) supplements the upper digits of the calling number NID, and the matching number TID and the calling number
The number of digits of the NID is made equal, and the process proceeds to step S6. Conversely, if the number of digits of the verification number TID is smaller than the number of digits of the calling number NID, the process proceeds to step S10 to supplement the above digits of the verification number TID with the own address SID, and the verification number TID and the calling number NI
The number of digits of D is made equal, and the process proceeds to step S6. If the number of digits of the collation number TID is equal to the number of digits of the calling number NID, the process directly proceeds to step S6.

Next, proceeding to step S6, the collation number TID and the calling number NID
Match all digits of. If the result of this comparison is that all digits match, the process proceeds to step S7, and a command to permit incoming calls is sent to the line control unit 4. Also, as a result of the collation in step S6, if the two do not match, the process proceeds to step S8. Then, it is determined whether or not reading of all the incoming call permitted dial numbers has been completed.If the determination result is "NO", the process returns to step S3,
In the case of "YES", the flow proceeds to step S9, and a call rejection command is sent to the line control unit 4. As a result, a response including information designating rejection of the incoming call and a rejection reason indicating that the incoming call has been rejected as a result of the identification incoming call is sent to the calling terminal device via the network, and the line is disconnected.

FIGS. 3 (a) and 3 (b) show the states of the calling number NID and the collation number TID when the upper digits are supplemented by the own address SID. FIGS. 3 (a) to 3 (c) show the case where the upper digits of the calling number NID are supplemented in step S5, and FIGS. 3 (d) to 3 (f) show the case in which the upper digit of the collation number TID is obtained in step S10. Indicates a digit. In these figures, each digit surrounded by a solid line in the self address SID indicates a portion used to supplement the upper digits of the calling number NID or the collation number TID. Each digit surrounded by a broken line in the calling number NID or the collation number TID indicates a portion supplemented by each digit surrounded by a solid line in the self address SID.

As shown in FIGS. 3A to 3C, the self address SI
As a result of supplementing the upper digits of the calling number NID by D, the calling number NID
Assume that there is a difference between the area code of the verification number TID and the area code of the verification number TID. In this case, the incoming call may be rejected because the call is from a different party from the area code specified by the upper digit of the collation number TID. Also, if all digits of the calling party number NID and the matching number TID match as a result of supplementing the upper digits of the calling party number NID, the call can be regarded as a call from a partner in the city who can accept the incoming call. Allow

In the cases shown in FIGS. 3D to 3F, the number of digits of the collation number TID is usually smaller than the number of digits of the self-address SID. In this case, obviously, the user can be regarded as having registered the abbreviated number with the intention of the other party in the city. Therefore, as shown in FIGS. 3 (d) to 3 (f), the self-address SID
There is no problem in supplementing the upper digits of the collation number TID. FIG. 3 (d) shows a case where the local number has four digits when the user registers the number, but the local number has six digits one day. Also in this case, the missing upper digits in the local number are supplemented by the own address SID, and as a result, when the local numbers match, the incoming call is permitted.

FIG. 4 explains the operation of another embodiment of the present invention. In this embodiment, when abbreviated dial registration is performed, the user is required to register only the local number for the other party in the city. As shown in FIG. 4, when the number of digits of the collation number TID is smaller than the number of digits of the calling number NID, it is considered that the collation number is a local number regardless of a call from outside the city. Returning to step S3, a new incoming call permission dial number is fetched. That is, by doing so, attention is paid to incorrect registration of the abbreviated number.

Various modifications are conceivable for the present invention. For example, when registering abbreviated numbers, as in the above embodiment, the upper digits are supplemented by the own address, and for the other party in the city, both the number with the area code and the number with only the local number are registered. Can be considered. Even in this case, the same effect as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, there is obtained an effect that incoming calls that should not be permitted are rejected, and normal identification incoming calls intended by the user are performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an ISDN communication terminal device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the embodiment, and FIG. 3 is a calling number NID in the embodiment.
FIG. 4 is a diagram for explaining the supplement of the collation number TID, and FIG. 4 is a diagram for explaining another embodiment of the present invention. 1 CPU, 2 ROM, 3 RAM, 4 Line control unit.

Claims (2)

(57) [Claims] 1. A dial number storage means for storing a dial number of a partner device to which an incoming call is permitted, and a dial number stored in the dial number storage means when a call setting request is received from a network in an identification reception mode. If the number of digits does not match, the number of digits of the calling number in the call setting request and the number of digits of the matching number are matched by supplementing the upper digits of the dial number of the own device. And an identification incoming call control means for rejecting an incoming call when the two numbers match and rejecting the incoming call when the numbers do not match. 2. A dial number storage means for storing a dial number of a partner device to which a call is permitted, and a dial number stored in the dial number storage means when a call setting request is received from a network in an identification reception mode. If the number of digits of the verification number is equal to or greater than the number of digits of the calling number in the call setting request, the toll number of the calling number in the call setting request is supplemented by supplementing the area code of the dial number of the own device. The number of digits is made to match the number of the matching number. If both numbers match, the incoming call is permitted. If the numbers do not match, the incoming call is rejected. And an identification incoming call control means for rejecting an incoming call if the number of digits is smaller than the number of digits of the calling number in the ISDN communication terminal device.