JPH0568097A - Subscriber call system - Google Patents

Abstract

PURPOSE:To attain subscriber call selectively without registration of a caller subscriber number and reception of the caller subscriber number allowing its call. CONSTITUTION:The call processing program of an exchange connects a caller subscriber A to an announcement trunk (ANT) to inform the necessity of a pass word to call a called subscriber B prior to calling the called subscriber B at the arrival of a call (step 3). Then a password sent from the caller subscriber A is received (step 5). The received password is compared with the password registered in advance corresponding to the called subscriber B (step 6a). Only when they are coincident, the program allows a ringing trunk (RGT) to start calling of the called subscriber B (step 6).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber calling system in an electronic exchange.

[0002]

2. Description of the Related Art Conventionally, in a selective subscriber calling system,
Register the caller number of the subscriber who does not want to receive the call or the caller number of the subscriber who wants to receive the call in advance, and compare the caller number sent from the calling station with the registered number. Then, the method of making or not making the call of the called subscriber is adopted.

[0003]

In the above-described conventional selective calling system for subscribers, when a plurality of subscribers are selected, it is necessary to register a subscriber number a plurality of times, which complicates subscriber operations. There was a problem.

Further, when the calling subscriber number is not relayed from the calling station to the called station, there is a problem that the calling subscriber number cannot be selected because the calling subscriber number cannot be identified.

[0005]

According to the subscriber calling method of the present invention, when a call arrives in the subscriber calling method in a storage program control type exchange, the exchange starts calling the called subscriber. An announcement connection process is performed to notify the calling subscriber that the password is required to call the called subscriber, and the password sent from the calling subscriber is received after this announcement connection. Then, the personal identification number and the personal identification number registered in advance for each called subscriber are compared, and the calling of the called subscriber is started only when they match.

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1 is a call processing state transition diagram of a local telephone call in an electronic exchange for explaining an embodiment of the present invention. When the calling subscriber A makes a call from an empty state (step 1), the state transits to a state of receiving a numeral. The subscriber A dials the subscriber B who wants to receive a call.

When the PB receiver (PBREC) completes the reception of digits (step 2), the incoming call analysis is performed and it is judged whether or not the subscriber B is a subscriber to which selective subscriber calling is applied (step 3a). If the subscriber is a general subscriber, the ringing trunk (RGT) transits to the ringing state (step 4). In the case of an applicable subscriber, it transits to the state of announcement connection and notifies subscriber A that it is necessary to dial the password for calling the called subscriber by the announcement trunk (ANT). Is performed (step 3).

Next, when the announcement times out or when the first digit of the password dialed by the sender by the PB signal is received, the announcement is cut off and the state is changed to the password receiving state of step 5 in order to receive the subsequent password.

When the password having the required number of digits is received from the subscriber A, the password is compared with the password registered by the subscriber B in advance (step 6a). If they match, the subscriber is called. Therefore, the state transits to the calling state in step 6, and if they do not match, a reorder tone is sent to the subscriber A, and then the subscriber A is released.

[0011]

As described above, according to the present invention, the personal identification number of the called subscriber is sent from the calling subscriber, and the calling subscriber is permitted to make a call. The subscriber can be selectively called without registering the subscriber number and receiving the calling subscriber number.

[Brief description of drawings]

FIG. 1 is a call processing state transition diagram in the case of a local call used in a call processing program in an electronic exchange for explaining an embodiment of the present invention.

Claims (1)

[Claims] 1. In a subscriber calling method in a storage program controlled exchange, when a call arrives, the exchange calls the called subscriber to the calling subscriber before starting the calling of the called subscriber. In order to notify you that a PIN is required, the announcement connection process is performed, and after receiving this announcement, the PIN sent from the calling subscriber is received, and this PIN and each incoming subscriber are handled in advance. The subscriber calling system is characterized by comparing the registered personal identification number with the registered personal identification number and starting the calling of the called subscriber only when they match.