KR100302335B1 - Method for sharing central office line by using Q-signalling in private branch exchange system - Google Patents

Abstract

The present invention provides a method for sharing a trunk line using Q signaling of a private exchange system. In the present invention, when a user belonging to one simple private exchange occupies a trunk line, the simple private exchange receives an input of a trunk line occupancy event from the user. In addition, the system sends a trunk line shared call setup message to a simple private exchange connected by Q signaling, and the simple private exchange connected by Q signaling occupies a trunk line which can be used by one simple private exchange, and then transmits a setup response message together with a dial tone. A user sends a dial digit event to a simple private exchange connected by Q signaling through a simple private exchange, and the simple private exchange connected by Q signaling transmits a PSTN to the occupied trunk line. Of users connected via the / ISDN network By sending the number and sending the call processing signal and connection message to the user belonging to one simple private exchange, if two or more simple private exchanges interwork with Q-SIG, the trunk line connected to one system can be shared by other systems. It will be possible.

Description

Method for sharing central office line by using Q-signalling in private branch exchange system}

The present invention relates to a trunk line sharing method using Q signaling of a private exchange system. Particularly, when two or more simple private exchanges interwork with a Q-SIG, a private line is suitable for sharing a trunk line connected to one system with another system. The present invention relates to a trunk line sharing method using Q signaling of a system.

1 is a block diagram of a general private exchange system.

As shown therein, reference numerals 11 to 13 are simple private exchanges, and 20 is a public switched telephone network (PSTN) / integrated services digital network (ISDN) connected to the simple private exchanges (11 to 13). Information communication network), and 31 to 33 are subscriber stations connected to the simple private exchange 11 (12) and the PSTN / ISDN network 20.

So, by using Q signaling, (a) simple private exchange (11) and (b) simple private exchange (12) are connected, and these simple private exchanges handle basic calls, and as additional functions, CALL FORWARD, CALL COMPLETION, Only extension related functions such as DND (Do Not Disturb) could be used.

In this case, Q signaling (Q-SIG) binds two simple private exchanges through a line, and allows two bundled private exchanges to operate independently as one.

2 is a flowchart illustrating a service processing method using Q signaling of a conventional private exchange system.

Thus, when a trunk line call is generated to a user A having a subscriber station in the system (A), which is a simple private exchange (ST1), a trunk line ring occurs at the terminal of the user-A (ST2).

When the user-A terminal calls to the user-B while making a call while receiving a trunk line call, the user-A terminal dials the switch button and the user-B to switch the trunk line (ST3).

Then, the trunk line transfer message to the user-B is transmitted from the user-A to the (A) system, the (A) system establishes a Q-SIG call to the user-B, and transmits the trunk line to the system (ST4). Then (b) the system receives it and receives a Q-SIG call from User-A to User-B (ST5), and User-B generates an extension ring tone from User-A (ST6).

So if user-B is off-hook (ST7), (B) the system handles the call connection with user-A (ST8), and (A) the system receives the call connection from user-B to make a call with user-A. (ST9).

Accordingly, when the call connection signal is received at the user-A, a call path is established between the user-A and the user-B (ST10).

If on-hook occurs at User-A after the end of the call (ST11), (a) the system terminates the call with User-B, connects to the call with the pending CO line, and sends additional message for CO- line and User-A. (ST12). Thus, (a) the system sends user-A and CO line information in the FACILITY message and sends it to (B) system, and (B) system transmits CO line and user-A information to user-B. It ends (ST13).

Thus, the user-B establishes a call path and displays information of the user-A and the trunk line (ST14).

As described above, only basic call establishment between the subscribers using the Q-SIG protocol and additional extension functions such as CALL TRANSFER or DND, CALL COMPLETION, and CALL FORWARD are possible.

However, in the interworking of the private exchange using Q signaling according to the prior art, only additional services on a predetermined standard can be used, and there is a problem in that beneficial functions such as trunk line sharing cannot be performed.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to share a trunk line connected to one system in another system when two or more simple private exchanges are linked to the Q-SIG. The present invention provides a trunk line sharing method using Q signaling of a private exchange system.

In order to achieve the above object, a trunk line sharing method using Q signaling of a private exchange system according to the present invention is provided.

When a user belonging to one simple private exchange occupies a trunk line, the simple private exchange receives a trunk line occupancy event from the user and transmits a trunk line shared call setup message to a simple private exchange connected through Q signaling; A simple private exchange connected via the Q signaling occupies a trunk line usable by the one simple private exchange and then transmits a setup response message to the user via the one simple private exchange with a dial tone; The user receiving the response transmits a dial digit event to a simple private exchange connected via the Q signaling via the one simple private exchange; The simple private exchange connected with the Q signaling receiving the dial digit event transmits the number of the user connected through the PSTN / ISDN network to the occupied trunk line, and then transmits a call processing signal to a user belonging to the simple private exchange. And transmitting a connection message with a user connected through a PSTN / ISDN network to a user belonging to the simple private exchange.

1 is a block diagram of a general private exchange system,

2 is a flowchart illustrating a service processing method using Q signaling of a conventional private exchange system,

3 is a flowchart illustrating a trunk line sharing method using Q signaling of a private switching system according to the present invention.

Explanation of symbols on the main parts of the drawings

11, 12, 13: Simple Private Exchange 20: PSTN / ISDN Network

31, 32, 33: subscriber terminal

Hereinafter, an embodiment according to the technical idea of the trunk line sharing method using Q signaling of the private exchange system according to the present invention will be described.

3 is a flowchart illustrating a trunk line sharing method using Q signaling of a private switching system according to the present invention.

As shown in the figure, when a user belonging to a simple private exchange occupies a trunk line, the simple private exchange receives a trunk line occupancy event from the user and transmits a trunk line shared call setup message to a simple private exchange connected through Q signaling. Step ST21 to ST24; The simple private exchange connected by the Q signaling occupies a trunk line which can be used by the one simple private exchange, and then transmits a setup response message along with the dial tone to the user through the simple private exchange (ST25 to ST28). )Wow; The user receiving the response transmits a dial digit event (ST29) (ST30) to the simple private exchange connected through the Q signaling via the one simple private exchange; The simple private exchange connected with the Q signaling receiving the dial digit event transmits the number of the user connected through the PSTN / ISDN network to the occupied trunk line, and then transmits a call processing signal to a user belonging to the simple private exchange. And transmitting a connection message with a user connected through a PSTN / ISDN network to a user belonging to the simple private exchange (ST31 to ST37).

The operation of the trunk line sharing method using Q signaling of the private switching system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First of all, in the present invention, a simple private exchange connected with a Q signaling protocol enables a trunk line in another system to be used, thereby providing convenience for use by allowing all trunk lines in all systems connected through Q signaling to be used. To alleviate

Therefore, referring first to FIG. 1, (a) the simple private exchange 11 and (b) the simple private exchange 12 are connected by Q-SIG, and (a) the simple private exchange 11 occupies the trunk line. In order to do so, the CO line must first designate a virtual CO line by sharing the Q-SIG CO line with the simple private switch 12. In this case, (b) If the private line is occupied by the simple private exchange 12, it is transmitted through the Q-SIG signaling so that the actual trunk line of the simple private exchange 11 is occupied. In (12), only (B) serves to connect the actual trunk line connected to the simple private exchange 12 and (A) simple private exchange 11.

So, suppose that subscriber B 32, the user shown in FIG. 1, wants to make a call with subscriber C 33, a user directly connected to the PSTN / ISDN network 20. FIG.

Then, in Fig. 3, (B) user B of the system occupies a trunk line designated as shared trunk line. At this time, (B) system sends Q-SIG CALL SETUP MESSAGE through CO line shared Q-SIG line. CO line sharing CALL SETUP MESSAGE is made possible by adding information of CO line sharing to Q-SIG CALL SETUP MESSAGE for (a) user A of system and (B) user B of system.

For example, this can be implemented using CODESET 5, which is a USER SPECIFIC CODE SET.

And (a) the system receives the Q-SIG CALL SETUP MESSAGE for CO line sharing from the system, occupies the designated CO line, and (a) connects the CO line of the system with the real user of the system. Let's go.

As described above, when two or more simple private exchanges interwork with Q-SIG, the trunk line connected to one system is shared by another system.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the trunk line sharing method using the Q signaling of the private exchange system according to the present invention enables users to use trunk lines of other systems when connected to the Q-SIG even though they do not have actual trunk lines. Increasing the cost will further reduce the phone bill.

Claims (1)

When a user belonging to one simple private exchange occupies a trunk line, the simple private exchange receives a trunk line occupancy event from the user and transmits a trunk line shared call setup message to a simple private exchange connected through Q signaling; A simple private exchange connected via the Q signaling occupies a trunk line usable by the one simple private exchange and then transmits a setup response message to the user via the one simple private exchange with a dial tone; The user receiving the response sends a dial digit event through the one simple private exchange to a simple private exchange connected with the Q signaling; The simple private exchange connected with the Q signaling receiving the dial digit event transmits the number of the user connected through the PSTN / ISDN network to the occupied trunk line, and then transmits a call processing signal to a user belonging to the simple private exchange. And transmitting a connection message with a user connected via a PSTN / ISDN network to a user belonging to the one simple private exchange.