JPH06311247A - Inter-station common line connecting system - Google Patents

Abstract

PURPOSE:To efficiently use speaking lines by calling a callee while using a common signal line, and selectively using one of plural speaking lines corresponding to the response of the callee. CONSTITUTION:A first automatic exchange 1 reports a call message through a common signal line CS to a second automatic exchange 2 when operating a call from a subscribed extension 3 to a terminal accommodated in the second automatic exchange 2. At the second automatic exchange 2, the call message is received, and a call completion message is reported through the common signal line CS to the first automatic exchange 1. Next, corresponding to the response of a subscribed extension 4 under calling, at the second automatic exchange 2, the free-line selection of first-nth speaking line trunks 6-1 to 6-n is performed and when any free speaking line is completely caught, a response message is reported through the common signal line CS to the first automatic exchange 1. At the first automatic exchange 1, any one of first-nth speech path line trunks 5-1 to 5-n corresponding to a line number in the response message is connected to the subscribed line 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interoffice connection system in an automatic exchange.

[0002]

2. Description of the Related Art Conventionally, as this type of inter-station connection system,
CCITT (International Telegraph and Telephone Advisory Committee) Recommendation No. The 7-signal system is adopted. This CCITT recommendation No. 7
In the signaling system, since the call line number is added to the address message at the time of the outgoing connection to the other exchange, the call line is selected and captured in advance. In this way, CCITT Recommendation No. The 7-signal system captures and uses the call line even when the call is being made. Therefore, when calling the repeater of the other exchange, which blocks all the incoming calls, the call line is as many as the number of calls being made. Will be needed. In addition, when all the communication channels are in use, no call can be made.

Further, in the conventional inter-station connection system, the call path line is in use even during a holding operation during a call, and the hold tone is sent to the call path line by the accommodation switch of the hold setting person. There is.

Further, Japanese Unexamined Patent Publication No. 59-70347 discloses a "remote control system using an interrupt line" in which control information is transmitted to a partner station using an interrupt line or a test line which has been conventionally used. ing.

[0005]

As described above, in the conventional inter-station connection method, the call path line is selected when the call is connected to another exchange, so that the call is not actually being made during a call. Even in the state, the call line is still used and is not being used efficiently. In addition, it is not possible to call more than the number of channels.

Further, in the conventional inter-station connection method, the call line is not being used efficiently because the call line is in use even in the hold state.

The remote control system using an interrupt line disclosed in Japanese Patent Laid-Open No. 59-70347 discloses that control information is simply transmitted to the partner station by using an interrupt line or a test line. However, it does not disclose anything about when to selectively use a communication line.

An object of the present invention is to provide an inter-station common line connection system which can efficiently use a communication channel.

[0009]

An inter-office common line connection system according to the present invention is a network in which a plurality of speech path lines and a common signal line connect between first and second automatic exchanges.
A step of calling the called party using a common signal line in an inter-office common line connection method for connecting a calling party accommodated in the first automatic exchange and a called party terminated in the second automatic exchange; , And selectively using one of the plurality of communication channels depending on the response of the called party.

In the inter-office common line connection system according to the present invention, in the above network, a step of restoring a call line used for a call by further holding a call in progress, and a hold setting. Re-intervention by the person again selecting and using one of the plurality of communication channels.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Referring to FIG. 1, a network to which an inter-station common line connection system according to an embodiment of the present invention is applied is a first and a second automatic control system capable of performing connection control according to the inter-station common line connection system of the present invention. It has exchanges 1 and 2. A subscription extension 3 is connected (accommodated) to the first automatic exchange 1, and a subscription extension 4 (accommodation) is connected to the second automatic exchange 2.
Between the first automatic exchange 1 and the second automatic exchange 2, the first to nth communication channel lines MC _{1 to} MC _n and the common signal line C are provided.
It is connected with S. The first automatic exchange 1 is connected with first to n-th call path trunks 5-1 to 5-n that interface with the first to _n-th call path circuits MC _{1 to} MC _n, and a second automatic switch. The exchange 2 has _{first to nth} interface circuits for interfacing the first to _nth communication channel lines MC _{1 to} MCn.
The call path line trunks 6-1 to 6-n are connected. Further, a signal line control trunk 7 that interfaces the common signal line CS is connected to the first automatic exchange 1, and a signal line control trunk 8 that interfaces the common signal line CS is connected to the second automatic exchange 2. There is. A relay stand 9 and an announcement trunk 10 are further connected to the second automatic exchange 2.

Next, referring to FIG. 2, a call connection from the subscriber extension 3 accommodated in the first automatic exchange 1 to the subscriber extension 4 accommodated in the second automatic exchange 2 and the relay stand 9 is performed. The operation when performing will be described. That is, in this example, the subscriber extension 3 is the calling party, and the subscriber extension 4 or the relay stand 9 is the called party.

When a call is made from the subscriber extension 3 to the terminal accommodated in the second automatic exchange 2, the second signal is sent via the common signal line CS.
The automatic exchange 2 is notified of the call message (step 100).

As shown in FIG. 3, the paging message comprises a routing label, a line number, a message type, callee information, and caller information. The line number is set to "0" because the communication line is not used, and the message type is set to "call message". As the callee information, the callee number of the other party by the calling operation of the subscriber extension 3 is added, and as the caller information, the caller number, the calling station number, and the caller accommodation position information are added.

The second automatic exchange 2 receives the call message, and when the corresponding terminal is determined to be the subscriber extension 4 from the call destination information in the message, the call control is performed on the subscriber extension 4 and the call completion message is sent. Notify the first automatic exchange 1 via the common signal line CS (step 10).
1). When the corresponding terminal is the relay stand 9, the second automatic exchange 2 displays the incoming call and the congestion of the relay stand 9 and notifies the first automatic exchange 1 of a call completion message via the common signal line CS. (Step 101).

As shown in FIG. 4, the call completion message includes a routing label, a line number, a message type, caller information, and callee information. The line number is "0" because the communication line is not used, and the message type is "call completion message". The caller information is the caller information in the received call message, and the callee information is the terminal number of the call connection in the second automatic exchange 2.

When the call completion message is received, the first automatic exchange 1 sends a ringing tone (RBT) to the subscriber extension 3.

In response to the response from the calling extension 4 that is calling or the relay stand 9 that is displaying an incoming call, the second automatic exchange 2 selects the first to nth communication line trunks 6-1 to 6-n as vacant. Then, when the acquisition of the unused communication path line is completed, the response message is notified to the first automatic exchange 1 via the common signal line CS (step 102).

As shown in FIG. 5, the response message includes a routing label, a line number, a message type, sender information, and responder information. The line number is set to the line number of the selected communication line, and the message type is set to "response message". The sender information is the sender information in the received call message, and the terminal information of the responding person is added to the responder information.

If there is no idle call line, all the call lines are in use by connecting the subscription extension 4 or the relay stand 9 which responded by the second automatic exchange 2 and the announcement trunk 10. Then, when the extension line 4 or the relay stand 9 is restored, the calling state and the incoming call display state are set again.

When the response message is received, the first automatic exchange 1 sends the first message corresponding to the line number in the response message.
To one of the nth communication line trunks 5-1 to 5-n and the subscriber extension 3 are connected, and a response completion message is notified to the second automatic exchange 2 via the common signal line CS (step 103).

As shown in FIG. 6, the response completion message comprises a routing label, a line number and a message type. The line number is used as the communication line number and the message type is set as "response completion message".

When the response completion message is received, the second automatic exchange connects the call line and the subscriber extension 4 or the relay stand 9 to establish a call with the originating subscriber extension 3.

Next, referring to FIG. 7, the subscriber extension 3 accommodated in the first automatic exchange 1 and the subscriber extension 4 or relay station 9 accommodated in the second automatic exchange 2 carry out the holding operation. The operation in this case will be described.

When the subscriber extension 4 or the relay stand 9 is held, the second automatic exchange 2 makes the first signal via the common signal line CS.
The hold setting message is notified to the automatic exchange 1 (step 200).

As shown in FIG. 8, the hold setting message comprises a routing label, a line number and a message type. The line number is the call line number used in the call, and the message type is "hold setting message".

When the hold setting message is received, the first automatic exchange 1 sends a hold tone (MSC) to the subscriber extension 3 and the first to nth call line trunks 5-1 used in the call. The recovery of steps 5 to 5-n is performed, and the hold setting completion message is notified to the second automatic exchange 2 via the common signal line CS (step 201).

As shown in FIG. 9, the hold setting completion message includes a ruling label, a line number and a message type. Set the line number as the call line number used in the call and set the message type to "hold setting completion message".
And

When the hold setting completion message is received, the second automatic exchange 2 sends a service setting sound (SST) to the subscriber extension 4 or the relay stand 9 to call the first to nth calls used in the call. One of the road lines 6-1 to 6-n is restored. With respect to the call on hold, the second automatic exchange 2 makes the first call by the hold response from the subscriber extension 4 or the relay stand 9.
Through to the n-th communication path line 6-1 to 6-n are selected and the acquisition of the unused communication path line is completed, the common signal line C
A hold response message is notified to the first automatic exchange 1 via S (step 202).

As shown in FIG. 10, the hold response message is composed of a routing label, a line number, a message type, on-hold party information, and on-hold responder information. The line number is the line number for which the idle selection was made, and the message type is "hold response message". The on-hold destination information is the on-hold destination number and destination station number,
As the hold responder information, the terminal information for the hold response is added.

When there is no available telephone line, the second extension 10 or the relay stand 9 and the announcement trunk 10 which have made a hold response by the second automatic exchange 2 are connected.
Notify that all the call lines are in use, and join extension 4
Alternatively, when the relay stand 9 is restored, it is put in the pending state again.

When the hold response message is received, the first automatic exchange 1 selects the first to nth communication line trunks 5-1 to 5-n corresponding to the line numbers in the hold response message.
Of the common signal line C
The hold response completion message is notified to the second automatic exchange 2 via S (step 203).

As shown in FIG. 11, the hold response completion message includes a routing label, a line number and a message type. The line number is used as the call line number, and the message type is "hold response completion message".

When the hold response completion message is received, the second automatic exchange 2 connects the call line and the subscriber extension 4 or the relay stand 9 and establishes a call with the subscriber extension 3 which is on hold.

It is needless to say that the present invention is not limited to the above-mentioned embodiments, and that various modifications can be made without departing from the scope of the present invention.

[0037]

As described above, according to the present invention, since the communication channel is used only when the actual communication is performed, the communication channel can be efficiently used. Further, when calling the relay stand accommodated in the other exchange, by preparing the call path lines for connecting the relay stand by the number of the relay stand, the same operation as the relay stand accommodated in the own exchange can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a network to which an inter-station common line connection method according to an embodiment of the present invention is applied.

[FIG. 2] From a subscriber extension accommodated in a first automatic exchange,
It is a sequence chart of the signal on a common signal line for clarifying the operation in the case of making a call connection to a subscriber extension and a repeater housed in a second automatic exchange.

FIG. 3 is a format of a paging message used in FIG.

FIG. 4 is a format of a call completion message used in FIG.

5 is a format of a response message used in FIG.

FIG. 6 is a format of a response completion message used in FIG.

FIG. 7 is a second extension and a second extension accommodated in the first automatic exchange.
6 is a frequency chart of signals on a common signal line for explaining an operation when a subscriber extension or a relay stand accommodated in the automatic exchange performs a holding operation.

FIG. 8 is a format of a hold setting message used in FIG. 7.

9 is a format of a hold setting completion message used in FIG. 7. FIG.

FIG. 10 is a format of a hold response message used in FIG. 7.

11 is a format of a hold response completion message used in FIG. 7. FIG.

[Explanation of symbols]

 1, 2 automatic exchange 3, 4 subscription extension 5-1 to 5-n, 6-1 to 6-n communication line trunk 7, 8 signal line control trunk 9 relay stand 10 announcement trunk

Claims (2)

[Claims] 1. A caller housed in the first automatic exchange and the second automatic exchange in a network connecting a first and a second automatic exchanges with a plurality of communication lines and a common signal line. In an inter-station common line connection method for connecting a called party terminated to an exchange, a step of calling the called party using the common signal line, and a response of the called party A common line connection method between stations including the step of selectively using one. 2. The network according to claim 1, wherein
Furthermore, the step of restoring the call path line used for the call by holding the call in progress, and the step of selecting and using one of the call path lines again by the re-intervention of the hold setting person. The inter-station common line connection system according to claim 1, including: