JPS6130787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a trunk line that automatically and constantly monitors the availability of a bidirectional trunk line when trunk line cap-on registration is made, thereby shortening the waiting time for vacant trunk lines in both directions. This relates to the camp-on method.

Conventionally, when a trunk line camp-on is registered, which automatically waits for a trunk line to become vacant, a call is automatically placed on the exchange at a certain period to that trunk line route, and at that time, if the trunk line is vacant, If so, the called party at the other station is called, and at the same time, the trunk line cap-on registrant of the local station is also called, and the two are connected via a relay line. but,
This camp-on system has the disadvantage that in the case of a trunk line with a high call volume, the waiting time becomes long because there are relatively many chances that the call will be interrupted while the call is being made automatically. Additionally, since the called party at the other station and the camp-on registrant are called at the same time, if the called party answers the call first, the called party will hear a special tone, but if the called party makes a mistake, However, there are disadvantages in that it is easy to misjudge and there is a risk that the connection will be disconnected.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, shorten the waiting time for vacant trunk lines, and provide a trunk line camp-on system that always calls the other party after the camp-on registrant responds. be.

For this purpose, the present invention constantly monitors the trunk line route when a trunk line is registered as camp-on, automatically blocks the line immediately if even one line becomes vacant, and prevents calls from the own station and other It is characterized by shortening the waiting time by calling camp-on registrants while preventing incoming calls from the station. Furthermore, the present invention is characterized in that the camp-on registrant calls the called party only after dialing the calling party number of the called party, thereby preventing disconnection due to an incorrect connection determination by the called party. do.

In addition, if the trunk line is accommodated in the line terminal of the other station, in order to block incoming calls from the other station, the trunk line of the local station remains in the same state as the call origination, that is, forms a loop for a long time. , you will be locked out. At that time, even if the camp-on registrant responds and is connected to the trunk line, he cannot make a call because he is locked out at the other station. In order to solve this problem, in the present invention, when a camp-on registrant is connected to the trunk line, the loop to the other party's station is momentarily released, the lockout of the other party's station is released, and the call can be made.

The present invention will be explained below with reference to FIGS. 1, 2, and 3.

First, an overview of the present invention will be explained with reference to a relay system diagram shown in FIG.

When making a call to the normal trunk line BWT, the extension
After hooking off, the EXT dials the number of the trunk line route. This allows trunk line BWT
If it is free, extension EXT and trunk line BWT are connected via main frame LF by a known marker M, and extension EXT dials the extension number of the other station after hearing the dial tone from the other station. You are connected to the called party and can speak.

However, if the trunk line BWT is all busy, the extension
A busy tone can be heard on EXT in a known manner. In this case, if you want to use relay automatic camp-on,
EXT once on-hooks the handset, then off-hooks again, then dials the trunk line camp-on registration special number + trunk line route number.

This dial allows marker M to connect the extension EXT and camp-on register trunk CRT to the main frame.
In addition to connecting via LF, the camp-on-register trunk also includes the calling party (in this case an extension).
Transfer the storage location of EXT). Extension XET
After confirming the registration completion tone from the camp-on register trunk CRT, the receiver turns on-hook and waits for trunk line BWT to become available. The camp-on-register trunk CRT constantly monitors the vacant trunk line BWT, and as soon as the trunk line BWT becomes vacant, it connects the vacant trunk line BWT and the camp-on register trunk CRT via the connector in the trunk line BWT. Marker M is also activated, and the storage position of trunk line BWT and camp-on registered extension line EXT are transferred. Marker M is an extension
Connect EXT and trunk line BWT. After this, the relay line
Extension EXT is called from BWT, but in this case trunk line BWT and camp-on-register trunk
When the CRT is connected, the trunk line BWT activates the other station to prevent incoming calls, and also blocks calls from the trunk line from its own station. When the camp-on registered extension EXT takes off-hook from the handset and responds to a call from the trunk line BWT, the connection between the trunk line BWT and the camp-on register trunk CRT is released, and the camp-on register trunk CRT is restored. The trunk line BWT also opens an instant startup circuit to the other station to release the lockout of the other station, then forms a startup circuit again to start up the other station, and transmits the dial tone of the other station to the extension.
This will prompt the EXT to dial, but this condition will now be the same as a normal trunk line call. Note that when a trunk line becomes vacant and the trunk line is put on hold, it is possible to block the subscribers of the own station, but it is not possible to block the other station. However, it cannot be applied to bidirectional trunks (bidirectional trunk lines).

Next, the operation of the above device will be described with reference to a specific embodiment shown in FIGS. 2 and 3. Figure 2 shows the relay line.
Figure 3 shows the circuit of the BWT and the circuit of the camp-on register trunk CRT. In Figure 2, RT in the trunk line circuit BWT is a ringing trip relay, RTA is its auxiliary relay, A is its A position relay, B is its B position relay, BA is its auxiliary relay, and CP is a camp-on relay. The connector relay between the trunk line BWT and the camp-on register trunk CRT, CPA, is its auxiliary relay, and the lowercase letters are the contacts of those relays. Further, C is a contact point of a known C position relay (not shown).

In Figure 3, in the camp-on register trunk circuit CRT, CA is the extension current supply and monitoring relay, CB is the B position relay, CMP is the camp-on registration relay, FN-, HG-, LVG-, LV.
- is extension accommodation position memory relay, TC is marker M
RP is the connector relay when the camp-on-register trunk CRT is captured from the camp-on-register trunk CRT, MR is the marker recovery display relay, MS is the marker activation relay, and the lowercase letters are their names. It is a relay contact.

Extension EXT dials the trunk line camp-on special number and trunk line route number. Marker M is camp-on register trunk corresponding to route number.
Capture the CRT with a known person and connect it through extension EXT and main frame LF. In Figure 3, in the camp-on register trunk CRT, the extension monitoring relay CA operates due to the extension EXT loop, and then B
Position relay CB operates. Main frame LF is held by contact cb ⁰ . On the other hand, marker M operates connector relay TC, and operates camp-on-trunk CRT storage position memory relays FN-, HG-, LVG-, LV- according to the storage position information of the extension through contacts tc ⁰ to tc ¹⁵ . let Contact fm ¹ -,
The camp-on registration relay CMP is activated by hg ¹ ―, lvg ¹ ―, lv ¹ ―, and self-maintained by contact cmp ⁰ . With contact cmp ¹ , housing position relay FN-, HG-,
LVG-, LV- are held and a marker M holding confirmation display is sent out. Marker M is restored by the display, and connector relay TC is also restored. contacts cmp ⁴
relays camp-on registration completion sound to extension EXT
Let it be heard through the CA coil. When extension EXT hears the registration completion tone and hangs up the handset, the loop is opened and extension monitoring relay A is restored. Subsequently, B position relay CB is also restored. By restoring contact cb ⁰ , the main frame LF will lose its holding power and the main frame LF will also be restored. In the camp-on register trunk CRT, relays CMP, FN-, HG-, LVG-, and LV- continue to operate. Contact point cmp ³ monitors the availability of trunk line BWT.

If the trunk line BWT becomes vacant in this state, the second
In the figure, relays A and B, which were operating during the call on trunk line BWT, are restored. At this time, contact b ¹ opens the loop with the other station and restores the other station's circuit. In addition, due to the recovery of relay B, relay BA recovers after waiting for the other station to recover, and due to the recovery of contact ba ⁰ , the signal from contact cb ² - cmp ³ of the camp-on register trunk CRT is restored. The camp-on relay CP operates by taking the preference with the trunk line BWT, and after operation, it is self-held by the contact cp ⁰ . On the other hand, contact cp ₄ of the activated relay CP
This forms a loop again to the other station, activates the other station, and prevents incoming calls from the other station. Also, the contact
With cp ⁵ , cut off the vacancy display to marker M,
The main trunk trunk BWT is blocked to prevent the main trunk BWT from being captured by the trunk transmission from the own station. Furthermore, contact CP ⁶ indicates to the camp-on register trunk CRT that this trunk line BWT has become vacant.

Camp-on-register trunk CRT in Figure 3
Then the marker activation relay MS operates. Contact ms ⁰
Accordingly, the connector relay RP takes the preference with other registers and operates, and activates the marker M. Marker M knows the activation from camp-on register CRT through contact rp ²⁴ , and transmits the accommodation position information of the extension EXT to relays FN-, HG-, LVG-, LV-
Holding contacts fn ⁰ ―, hg ⁰ ―, lvg ⁰ ―, lv ⁰ ― and contacts cmpl from connector relay RP contacts rp ⁰
Receive through ~rp ¹⁵ . Also, marker M is a contact point.
Trunk line freed in a known manner from trunk number group TNG in the circuit of contact CP ⁷ via RP ²⁰
Obtain BWT storage location information. Marker M connects extension line EXT and trunk line BKT via main frame LF using the information. When marker M completes all controls, marker recovery relay is activated through contact fp ²¹ .
MR operates and is self-held by contact mr ⁰ . contact
The camp-on registration relay CMP is restored by mr ¹ , and the connector relay RP is also restored by contact mr ² . Extension storage position memory relay FN―, HG―,
LVG- and LV- are restored by contact cmp ¹ . In this state, the relays operating in the camp-on-register trunk CRT are MS and MR.

Next, in the trunk line BWT of FIG. 2, when the trunk line BWT and the extension line EXT are connected, a calling signal is sent to the extension line EXT via the contacts rta ⁰ and rta ¹ . As a result, when extension EXT off-hooks the handset, relay RT in the trunk line BWT circuit operates, and relay RTA
will be restored. Current supply relay A is activated by the extension line EXT loop, and subsequently B position relay B is activated. Further, relay BA is operated by contact b ⁰ of relay B, and camp-on display relay CP is restored by contact b ⁰ of relay B, and subsequently, its auxiliary relay CPA is also slowly restored. From the time the relay CP is restored until the relay PA is restored, the loop to the other station is cut off by contacts b ¹ and cpa ⁰ , and if the other station is locked out, the lockout is released. relay CPA
When the station completes recovery, it forms a loop with the other station again and starts the other station. As a result, the other station sends a dial tone, so when the extension EXT dials the called number of the other station, contact ^A1 of relay A responds by sending a pulse to the other station.
The call status is the same as normal trunk line call.

Camp-on-register trunk CRT in Figure 3
is relayed by the restoration of contact cp ⁶ of trunk line BWT.
The MS and then the relay MR are restored and all relays return to normal and become vacant.

As described above, according to the present invention, as soon as a trunk line becomes vacant, that trunk line is reserved for camp-on registered extensions, and is blocked from general calls from within the local station and from incoming calls from the other station. Therefore, the waiting time for calling a camp-on registered extension is shortened compared to the conventional method.

Furthermore, since the called party at the other station is called after the camp-on registered extension responds, it is possible to prevent erroneous operations by the called party at the other station.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an interruption method of a trunk line camp-on system according to the present invention, FIG. 2 is a circuit diagram showing an embodiment of a trunk line circuit, and FIG. 3 is a circuit configuration diagram showing an embodiment of a camp-on register transfer circuit. EXT...Extension, LF...Main frame, M...Marker, CRT...Campaign register trunk, BWT...Relay line.

Claims (1)

[Claims] 1. When the trunk line camp-on registration special number and trunk line route number are dialed from the extension and the trunk line is registered as a trunk line, the two-way trunk lines of the trunk line route are constantly monitored, and if one of the trunk lines becomes vacant, By calling the extension, blocking the empty two-way relay line, connecting the extension to the empty two-way relay line when the extension is hooked off, and releasing the block to the other station, A relay automatic camp-on system characterized by enabling trunk line origination connection from an extension line to a called party at the other station.