JPH0775374B2 - Final called number judgment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a final called number determination method, and particularly to a final called terminal for inquiring from a subscriber line switchboard to a database station having a database of information on the number of digits required for dial signals. Number determination method.

[Conventional technology]

In the conventional final called number determination method, the final called number is determined by any one of the following three means.

(A) Method in which each subscriber line exchange has a database The database is provided in each subscriber line exchange, and the required number of digits is known by sequentially collating from the first dialed number.

(B) Method based on reception timeout When the dial signal is being received from the calling subscriber, the timing between digits is measured, and it is considered that the dial signal has been received when there is no reception for a certain period of time.

(C) Method based on address completion message As shown in the signal sequence diagram of FIG. 3, a database is provided only in the upper station, and each subscriber line exchange receives a dial signal of a predetermined number of digits from the calling subscriber. Then, the transmission of the dial signal is started, and the completion of the transmission of the final called number is known by receiving the address completion message from the upper station.

[Problems to be Solved by the Invention]

Each of the above-mentioned conventional final called number determination methods has the following problems.

In the case of the system having a database in each subscriber line exchange of (a), the same data is used in all the subscriber line exchanges, even though this type of database is determined by one type in one telephone network. This has a problem that the man-hours for maintenance and the equipment are increased.

In the case of the method of (b) by the reception timeout, the calling subscriber starts the connection process several seconds after dialing the final called number, which causes a problem of connection delay after dialing.

(C) In the case of the method by the address completion message, until the address completion message from the upper station is received,
As shown in the signal sequence diagram of FIG. 3, it is necessary to send a digit by the SAM at the same time as receiving the dial signal from the calling subscriber. However, for sending numbers by this SAM,
There are problems that the processing capacity of the exchange is reduced and the signal processing is complicated due to the large number of startups.

An object of the present invention is to inquire the number of digits to be transmitted by inquiring a database station having information on the number of digits to be transmitted of a dial signal issued by a calling subscriber as a database and performing control according to the received number of digits information. Since it is not necessary to provide a database for each subscriber exchange, the number of maintenance steps and equipment does not increase, and connection delay after dialing does not occur,
An object of the present invention is to provide a final called number determination method that does not reduce the processing capacity of the exchange and complicate the signal processing because the number of activations is small.

[Means for Solving the Problems]

The final called number determination method of the present invention should be sent as the dial signal by the signal method based on CCITT Recommendations Q771 to 775 when the dial signal issued by the calling subscriber to the subscriber line exchange is received up to a predetermined number of digits. The required digit number inquiry function for inquiring a database station that has the information regarding the number of digits to be transmitted as a database, and the digit designated according to the response information regarding the number of digits to be transmitted of the dial signal transmitted from the database station. A dial signal transmitting function for transmitting the dial signals of all digits received to the upper station immediately after receiving the dial signals of several numbers.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a signal sequence diagram of an embodiment of the present invention.

The calling subscriber 1 makes a call outside the city and dials "04
7-digit number "733495" shall be transmitted. Upon receiving up to 5 digits of the dial signal issued by the calling subscriber 1, the subscriber line exchange 2 uses the common line signaling method based on CCITT Recommendations Q771 to 775 to set the number of digits to be sent by the dial signal to the upper station 3. It has a function of inquiring the required number of digits to inquire the database station 4 having a database through. The database station 4 has a function of receiving an inquiry from the subscriber line exchange 2, analyzing the received 5-digit number based on the database, and transmitting response information regarding the number of digits to be transmitted.
When the subscriber line exchange 2 and the database station 4 are provided in close proximity to each other, the subscriber line exchange 2 may directly make an inquiry to the database station 4 without going through the upper station 3.

FIG. 2 is an explanatory diagram for explaining the function of the database.
It has a function of inputting several digits from the beginning of the subscriber number, collating the received digits, and outputting digit number information including the digits following the first few digits.

Next, the operation will be described.

Calling subscriber 1 makes an out-of-town call and dials "0473" as a dial signal.
When you start sending the 7-digit number "3495", the third digit "3"
The subscriber exchange 2 which has received the message sends an inquiry signal 5 for inquiring the required number of digits to the database station 4 having a database through the upper station 3. At this time, the inquiry signal 5 includes the five-digit number "04733". Inquiry signal 5
The database station 4 which has received the five-digit number in the above collates with the database to know the required number of digits. This required number of digits is used as an inquiry response signal 6 via the upper station 3 to the subscriber exchange 2
Sent to. The subscriber exchange 2 counts the number of digits received in the dial signal, and upon completion of receiving the same number of dial signals as the instruction of the required number of digits in the inquiry response signal 6, the upper station 3 immediately includes the dial signal in all digits. Send the initial address message IAM. The upper station 3 receives the dial signal of all digits and sends an address completion message ACM to the subscriber line exchange 2.

〔The invention's effect〕

As described above, according to the present invention, the number of digits to be transmitted by the calling subscriber is inquired from the database station having the database through the upper station, and control is performed according to the received number of digits information. Since the database of is not provided for each subscriber exchange, maintenance man-hours and equipment do not increase, connection delay after dialing does not occur, and the number of start-ups is small, resulting in deterioration of exchange processing capacity and signal processing complexity. There is an effect that a final number determination method without a problem can be obtained.

[Brief description of drawings]

FIG. 1 is a signal sequence diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the function of a database, and FIG. 3 is a signal sequence diagram of an example of a conventional final called number judging method. 1 ... Originating subscriber, 2 ... Subscriber line exchange, 3 ... Upper station, 4 ... Database station, 5 ... Inquiry signal, 6 ...
Query response signal.

Claims (1)

[Claims] 1. When a dial line signal sent by a calling subscriber is received by a subscriber line exchange up to a predetermined number of digits, the number of digits to be transmitted as the dial signal is transmitted by a signaling system based on CCITT Recommendations Q771 to 775. A required digit number inquiry function for inquiring to a database station that has information on the number of digits to be output as a database, and a dial signal of the number of digits specified according to response information about the number of digits to be transmitted as the dial signal transmitted from the database station. A final called number judging method having a dial signal sending function of sending a dial signal of all digits received to a higher station immediately upon reception.