JPS59132273A - Digit number determination method - Google Patents

Abstract

PURPOSE:To decide total number of digits to be received by a calling subscriber with a calling side exchange, by informing the result deciding the number of digits to be received with an incoming exchange to a preceding exchange and adding the number of digits and that to be received with the own station at a relay exchange receiving the information and repeating this procedure. CONSTITUTION:When a controller CC3 discriminates total number of digits (n), the n-digit information is transmitted to the preceding exchange EX2 via a register REG3, and when it is received by a controller CC2, a number of digits (m) of specific number for outgoing connection of the exchange EX2 is added to the n-digit information and the resulting (n+m)-digit information is returned to the preceding exchange EX1. The controller CC1 can discriminate the total number of digits to be dialed during the outgoing connection of a calling subscriber SUBA by receiving the (n+m)-digit information and when the dial number from the subscriber SUBA reaches the (n+m)-digit, the state is transited from the number transmitting state to the busy state.

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to outgoing connection processing in a private electronic branch exchange, etc., and in particular, the digit connection processing when dialing to another exchange via a dedicated line (or private line), etc. It concerns the number determination method.

Network construction is possible using a numbering plan, and this is also one of its features.

However, when connecting private branch exchanges using a dedicated line, etc., each private branch exchange must determine the number of digits for internal numbers, special numbers (for services, outgoing connections, etc.) based on its own numbering plan; Waiting for the interdigit timing out (the elapse of time that identifies that the next dialing code will not be entered) after the calling subscriber finishes dialing the intended subscriber number during an outgoing connection, The switching equipment, relay switching equipment, etc. that accommodated the originating subscriber takes a system in which the call is placed in a communication state.

For this reason, in call processing, even if the exchange determines that the call has entered a busy state, inconveniences may occur, such as when the other party's number is actually being dialed or the call is already in a ringing state. .

It is also possible to understand the numbering system of the exchange network at each exchange or to match the number of digits, but if there is a change in the numbering plan, it would be necessary to change the data in all exchanges, which is disadvantageous.

(3) Purpose of the Invention In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems by changing the number of required dial relay digits to the number of digits of the outgoing dial digits of the called party at the time of outgoing connection in an exchange accommodating the calling subscriber. The object of the present invention is to provide a method for determining the number of digits that allows a transition from the dial relay (number sending) state to the next state after receiving the dial from an exchange (subsequent station) and relaying the dial for the number of 5 regular digits.

(Phrase) Structure of the Invention In order to achieve the above object, the present invention provides: (1) In a telephone switching network, when making a call connection between a plurality of exchanges, the number of the called subscriber is transferred from the originating exchange that accommodates the calling subscriber to the terminating exchange. When transmitting to the forward exchange, the number of digits to be received is determined based on the dialed digits received sequentially at the incoming exchange, the IA information of M digits is returned to the preceding exchange, and the originating exchange of the preceding exchange determines the number of digits to be received. determining the number of digits to be received from the originating subscriber according to the information, and when the preceding exchange is a relay exchange;
The received digit information determined by the preceding exchange is added to the digit information returned from the i exchange, and the digit information is returned to the originating exchange. DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention is characterized in that it determines the number of digits to be received from (phrase) Embodiments of the Invention The present invention will now be explained in more detail with reference to embodiments.

FIG. 1 shows a state transition diagram of a trunk (or trunk for outgoing connection) as an example of outgoing connection processing.

Each state from 1 to 6 is empty state 1, dial reception waiting state (1
When an extension subscriber SUB sends a dial tone and indicates a state of waiting for dial input from the subscriber (2), a dial reception state of 3, and an outgoing call state of 6, an outgoing connection is made from the local exchange to another exchange. , first dial the special number for outgoing connection.
'i exchange receives the special number in state 3, and when it identifies that it is an outgoing call through internal processing, the empty trunk trunk P
Transition VT.

The subscriber SUB then dials the called party's built-in number to the other party's exchange. Furthermore, there may be cases where the number 9 for outgoing connection is dialed at the other party's exchange via the other party's exchange, and after being connected to the final terminating exchange, the in-house subscriber is dialed.

Therefore, the number of digits cannot be determined by the originating exchange or the transit exchange, and by counting the time when the dialing operation of the originating subscriber SUB is stopped, a transition from state 5 to state 6 is made by immediately timing out between digits.

In the present invention, the number of digits is determined for the transition from the dialing state 5 to the talking state 6, and dialing for the number of digits is performed after the dialing state 5 is transmitted.

FIG. 2 is a diagram for explaining the method for determining the number of digits to be dialed, and FIG. 3 is a time chart showing the sequence of dial relay and determination of the number of digits in FIG. Second
In the figure, fCX,, f[iX, X IXJ private branch exchange, BUBk, BUBB are subscribers, SW,, sw,, s
w, is the communication path, QOl, 00! , ccs is the central control unit, RIIiG, ft In G, , RffiG is the number reception, Pa signal transmission register, PVTo, PVTL
is a relay trunk, showing OrI'i output side and 1 expansion connection side. Here, assume that subscriber 8UBA and subscriber 8ffBB are connected, and if BUBk is the originating subscriber and 5UBB is the terminating subscriber, first, by a known outgoing connection process,
Receive the outgoing special number of exchange IK in register all:G (this number is 2 digits "00#") 3 Control debt 00
1 is based on this received number "'oo". When the exchange [t receives an incoming call from the trunk trunk l'lTL, the controller DC connects the trunk trunk pv'rt and the V register RIIC.
Connect to G2 and prepare for dial reception. This switch K
For X, if the outgoing connection special code is a one-digit “Δ”, the originating subscriber 13UBA is II o o #1△ after dialing”
will be dialed.

This dial is received by the exchange 1ijX, and the control device C
If C2 determines that it is an outgoing connection, the trunk trunk PVT
Capture o and activate it. When the exchange EX learns of the incoming call from the trunk trunk pv'r1, it registers RIii.
3 Calling subscriber 5 connects to G3 and prepares to receive dialing
UBA then receives the incoming subscriber 5U accommodated in the exchange [CX].
Dial BB dial number "'xxxx" fr (
The number of SUBB number digits is 4 digits).

At this time, the control device Co of switch 4 is the joining old number,
When the first digit or two of the number "xxxx" is received, it is recognized as an extension subscriber number, so it can be determined that the number of received digits is complete when four digits are received.

However, as explained earlier, the originating exchange fcXl.

The relay exchange gx still cannot determine how many digits remain to be received. Therefore, in the present invention, when the control device CC determines the total number of digits to be received, and in this example, when the control device oO□ receives this 4-digit (n-digit) information, the switch 11cX receives the 4-digit information. The number of digits for the outgoing connection special number, in this example, 1 digit (generally m digits) is added to the previous 4 digit information, and 5 digits (n-
1-m digit) information is returned to exchange ■X1. Control device O
By receiving this 5-digit (n+m digit) information, c1 will have 5 total digits to dial during outgoing connection of SUB&.
digits (n+m digits), and when the number of call-out codes (dials) from the subscriber 5UBA reaches 5 digits (n 10m digits), the state changes from the digit sending state to the busy state. Transition.

Naturally, the relay exchange fCX, but PVTL→PVT
If four digits (n digits) are relayed from the numeric sending state during relaying of o, a relay call in progress (trunk-to-trunk call) state can be established.

FIG. 3 shows a time chart leading to the determination of the number of digits in the configuration of FIG. 2. In FIG. 3, the same symbols as in FIG. Special call numbers ゛△'', b, and c are exchanges II
Indicates the extension subscriber number "xxxx" of CX3.

glh indicates the internal processing of the exchange [CX, g is the special number "
△ "a" is received and trunk line trunk PVTo'f!: capture activation processing; h indicates relay processing of number "Xxxx'b; 3d indicates processing for determining the number of received digits at the exchange date; In this example, the first two digits indicate that the number of 4 digits to be received has been determined, e is a return pulse with 4 digits (n digits), f is a return pulse with 5 digits (h + n digits), There is a PB double signal common channel signaling system, and various other methods are possible, such as the use of a dorsal transmission path such as a digital line.

In this embodiment, the need for notification during a call can be eliminated by notifying the number digit information to each exchange periodically when transmitting the selected number to the subsequent station, occasionally on the reverse direction line, transmission path, etc. It is possible, and it is also conceivable to notify a change in the number of digits of a certain exchange.

(6) Notify the effect of the invention to the preceding exchange, and the relay exchange that received the notification adds the number of digits and the number of digits that should be received at its own station (the number of digits that determines that it is an outgoing connection). , and then notifies the previous exchange,
- By repeating this process, the originating exchange can determine the total number of digits to be received from the originating subscriber, so it is possible to determine the total number of digits to be received from the originating subscriber, without having to perform inter-digit timeout processing or knowing the entire numbering plan of the exchange network. Can make decisions.

[Brief explanation of the drawing]

Fig. 1 is a state transition diagram as an example of the outgoing connection processing of the exchange, Fig. 2 is an explanatory diagram of the digit number determination method of the present invention, and Fig. 3 shows the sequence of dial relay and digit number determination in Fig. 2. This is a time chart. gx,,I! tXtXEX3; Exchange 001.002, CC3+ control station

Claims (2)

[Claims] (1) In a telephone exchange network, when connecting a call between multiple exchanges, when the originating exchange that accommodates the calling subscriber sends the called subscriber's number to the terminating exchange, the dialed numbers received sequentially at the terminating exchange are used. , determine the number of digits to be received, send information on the number of digits back to the preceding exchange, and the originating exchange of the preceding exchange determine the number of digits to be received from the originating subscriber based on the information on the number of digits. A method for determining the number of digits. (2) When the preceding exchange is a relay exchange,
The received digit number information determined by the preceding exchange is added to the digit number information returned from the terminating exchange, and the digit number information is returned to the originating exchange. A digit number determining method according to claim 1, characterized in that the number of digits to be received is determined.