JP2864198B2 - Station common line connection method - Google Patents

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 kind of inter-station connection system,
CCITT (International Telegraph and Telephone Consultative Committee) Recommendation No. A seven-signal system is employed. This CCITT Recommendation No. 7
In the signaling method, a call channel is selectively captured in advance in order to add a call channel number to an address message at the time of outgoing connection to another exchange. As described above, CCITT Recommendation No. In the case of the 7 signaling method, the call channel is captured and used even in the state of ringing. Therefore, in the case of a call of a relay console of another exchange that is stuck in all incoming calls, the number of call channels is equal to the number of ringing calls. Required. Also, if all the communication lines are in use, the call cannot be made.

Further, in the conventional interoffice connection system, the telephone line is in a busy state even during a hold operation during a telephone call, and a hold tone is transmitted to the telephone line by an accommodation exchange of the person who set the hold. I have.

Japanese Patent Laid-Open Publication No. Sho 59-70347 discloses a "remote control system using an interrupt line" for transmitting control information to a partner station using a conventionally used interrupt line or test line. ing.

[0005]

As described above, in the conventional interoffice connection system, when a call is connected to another exchange, a call path line is selected. In this case, the communication line is used, and it is not used efficiently. Also, calls cannot be made beyond the number of communication lines.

Further, in the conventional interoffice connection method, the communication line is not used efficiently because the communication line is in use even in the hold state.

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

It is an object of the present invention to provide an interoffice common line connection system capable of efficiently using a communication line.

[0009]

According to the present invention, there is provided an inter-office common line connection system in a network connecting a first and a second automatic exchange with a plurality of communication lines and a common signal line.
Paging a called party using a common signal line in an interoffice common line connection system for connecting a calling party accommodated in a first automatic exchange and a called party terminated in a second automatic exchange; Selectively using one of the plurality of communication lines in response to the called party's response.

In the inter-office common line connection system according to the present invention, in the above-mentioned network, a step of restoring a communication line used for a call by holding a call during a call, and setting a hold. Selecting and using one of the plurality of communication lines again by the intervention of the user.

[0011]

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

Referring to FIG. 1, in a network to which an inter-station common line connection system according to an embodiment of the present invention is applied, a first and a second automatic connection control which can perform connection control by the inter-station common line connection system according to the present invention. It has exchanges 1 and 2. A subscriber extension 3 is connected (accommodated) to the first automatic exchange 1, and a subscriber extension 4 (accommodation) is connected to the second automatic exchange 2.
First automatic switch 1 between the second automatic exchange 2, the common signal line and the communication channel circuits MC ₁ to MC _n of first through n C
It is connected with S. The first automatic switch 1 is connected first to the speech path line trunk 5-1 to 5-n of the n interfacing speech path line MC ₁ to MC _n of first through n, second automatic The exchange 2 has _{first to n-th} interfaces that interface the first to _n-th communication lines MC _{1 to} MC _n .
Are connected. A signal line control trunk 7 for interfacing a common signal line CS is connected to the first automatic exchange 1, and a signal line control trunk 8 for interfacing a common signal line CS is connected to the second automatic exchange 2. I have. 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 console 9 will be described. The operation when performing the operation will be described. That is, in this example, the subscriber extension 3 is the calling party, and the subscriber extension 4 or the attendant console 9 is the called party.

In a call operation from the subscriber extension 3 to the second automatic exchange 2 accommodating terminal, the second extension is performed via the common signal line CS.
A call message is notified to the automatic exchange 2 (step 100).

As shown in FIG. 3, the call message includes a routing label, a line number, a message type, call destination information, and caller information. The line number is set to “0” because no communication line is used, and the message type is set to “call message”. As the call destination information, a call number of the other party by the calling operation of the extension 3 is added, and as the caller information, a caller number, a calling station number, and caller accommodation position information are added.

The second automatic exchange 2 receives the call message, and if the corresponding terminal is determined to be the subscriber extension 4 from the call destination information in the message, performs call control for the subscriber extension 4 and sends a call completion message. The first automatic exchange 1 is notified via the common signal line CS (step 10).
1). When the terminal is the relay console 9, the second automatic exchange 2 displays the incoming call and the backlog of the relay console 9, and notifies the first automatic exchange 1 of the 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 call destination information. The line number is set to "0" because no communication line is used, and the message type is set to "call complete message". As the caller information, the caller information in the received call message is added, and as the callee information, the terminal number of the call connected by the second automatic exchange 2 is added.

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

In response to the response from the calling extension 4 or the relay station 9 displaying the incoming call, the second automatic exchange 2 selects the first to n-th trunks 6-1 to 6-n. Then, when the acquisition of the idle communication line is completed, a 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. It is assumed that the line number is the communication line number for which the vacancy was selected, and the message type is "response message". The caller information is the caller information in the received call message, and the information of the responding terminal is added to the responder information.

When there is no available communication line, the communication line is all in use by connecting the announcement extension 10 to the extension 4 or the relay station 9 responded by the second automatic exchange 2. Then, when the extension 4 or the relay station 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 automatic exchange 1 corresponding to the line number in the response message.
And connects one of the n-th to n-th trunks 5-1 to 5-n to the subscriber extension 3, and notifies the second automatic exchange 2 of a response completion message via the common signal line CS (step). 103).

As shown in FIG. 6, the response completion message includes 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 complete message".

When the response completion message is received, the second automatic exchange connects the communication line and the subscriber extension 4 or the intermediary console 9 to make a call to the calling subscriber extension 3.

Next, referring to FIG. 7, subscriber extension 3 accommodated in first automatic exchange 1 and subscriber extension 4 or attendant console 9 accommodated in second automatic exchange 2 perform a hold operation. The operation in this case will be described.

When the subscriber extension 4 or the relay console 9 is put on hold, the second automatic switching system 2 causes the first automatic exchange 2 to perform the first operation via the common signal line CS.
Of the hold setting message to the automatic exchange 1 (step 200).

As shown in FIG. 8, the hold setting message includes a routing label, a line number, and a message type. The line number is the line number of the communication line 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 n-th line trunks 5-1 used in the call. 5 to n, and notifies the second automatic exchange 2 of a hold setting completion message 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. The line number is the line number of the telephone line used for the call, and the message type is "Hold setting complete message".
And

Upon receiving the hold setting completion message, the second automatic exchange 2 sends a service setting tone (SST) to the subscriber extension 4 or the attendant console 9 and the first to n-th calls used in the call. One of the road lines 6-1 to 6-n is restored. In response to the call on hold, the second automatic exchange 2 sends a first response to the call from the extension 4 or the attendant console 9.
When the vacancies of the n-th to n-th communication lines are selected and the capture of the vacant communication lines is completed, the common signal line C
The first automatic exchange 1 is notified of the hold response message 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, held party information and held responder information. It is assumed that the line number is the line number of the communication channel for which the vacancy was selected, and the message type is "hold response message". The pending destination information includes the pending destination number and the destination station number,
The information of the terminal that has made the hold response is added as the hold responder information.

When there is no free communication line, the announcement extension 10 is connected to the subscriber extension 4 or the attendant console 9 which has been put on hold by the second automatic exchange 2, and the announcement trunk 10 is connected.
Inform that all communication lines are in use and add extension 4
Alternatively, the state is held again when the relay console 9 is restored.

When the hold response message is received, the first automatic switching apparatus 1 sets the first to n-th communication line trunks 5-1 to 5-n corresponding to the line numbers in the hold response message.
Is connected to the pending subscriber extension 3, and a common signal line C
The second automatic exchange 2 is notified of the hold response completion message 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. It is assumed that the line number is the communication line line number in use, and the message type is “hold response completion message”.

When the hold response completion message is received, the second automatic exchange 2 connects the communication line to the extension 4 or the attendant console 9 and makes a call to the extension 3 on hold.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0037]

As described above, according to the present invention, the telephone line is used only when actually making a telephone call, so that the telephone line can be used efficiently. In addition, by preparing the number of communication lines for connecting the relay stations by the number of the relay stations by calling the relay stations accommodated in the other exchanges, it is possible to operate in the same manner as the relay station accommodating the own exchange.

[Brief description of the drawings]

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

FIG. 2 shows a subscriber extension housed in a first automatic exchange,
9 is a sequence chart of signals on a common signal line for clarifying an operation when making a call connection to a subscriber extension and a relay console accommodated in a second automatic exchange.

FIG. 3 is a format of a call message used in FIG. 2;

FIG. 4 is a format of a call completion message used in FIG. 2;

FIG. 5 is a format of a response message used in FIG. 2;

FIG. 6 is a format of a response completion message used in FIG. 2;

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

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

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

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

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

[Explanation of symbols]

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

Claims (1)

(57) [Claims] 1. A plurality of automatic exchanges between a first and a second automatic exchange.
In a network connected by a telephone line and a common signal line,
A caller housed in the first switchboard and the second
Inter-office common line connecting the called party accommodated in the automatic exchange
In the connection method, the called party is called using the common line.
Exiting and the called party's response,
Selecting one of the talk lines and using the active call.
Call line used for the call by holding
Recovery steps and re-intervention by the hold setter
And selectively using one of the plurality of telephone lines.
Station-to-station common line connection method.