KR100283395B1 - External forwarding device and method of private branch exchange system - Google Patents

Abstract

When a subscriber joining the PSTN network inputs a certain telephone number to receive an external call service in the private branch exchange system, the subscriber who requested the call service according to the CO line requested for the call service, even if the same telephone number is registered in the private branch exchange system And a call connection request is detected from the PSTN through the dedicated port, the call is connected and then the request for inputting the telephone number to be received is transmitted to the voice message Analyzing digits inputted as a DTMF signal according to a voice message to be transmitted and determining whether the digit value analyzed is a currently used extension number; if the extension number is an extension number, calling a corresponding extension terminal, If not, point to a specific area through the incoming port. A call number of the corresponding subscriber located closest to the subscriber requesting call forwarding from the table set in the memory means according to the group number indicating the searched specific area and the number of the analyzed digits, And connecting the CO to the CO via the dial-out port according to the accessed call number, and connecting the call connection with the subscriber terminal requesting call forwarding after connecting the call.

Description

External forwarding device and method of private branch exchange system

The present invention relates to a private branch exchange system. More particularly, the present invention relates to a private branch exchange system, and more particularly, to a private branch exchange system in which when a subscriber joining a public switched data network (PSTN) To an external call forwarding apparatus and method of a private branch exchange system that allows a subscriber who is in the vicinity of a subscriber who has requested a call reception service to connect to a subscriber who is located in an area close to the same telephone number.

In general, the telephone number franchise business that provides call forwarding service, proxy secretarial service, voicemail service by connecting a private branch exchange system to the PSTN network is increasing.

Such a franchise business is a service that uses the intelligent network to connect a telephone number requested by a caller to a call connection request signal which is not a service of a caller's telephone number but is different according to a caller's location, to be.

For example, an employer who is engaged in a franchise business joins people who are engaged in various industries as a member, and then dials the telephone number of the member to be joined, so that connection with an arbitrary company is required from other subscribers through the call incoming line 080 In this case, the subscriber terminal requesting the call connection through the 080 dedicated line and the corresponding company requested by the subscriber terminal are connected to the call forwarding line.

However, in general, subscribers engaged in a specific industry such as a moving center or an emergency dispatch service use a telephone number that is easy to associate with the industry, and these easy-to-associate telephone numbers are each one So many telephone numbers are given to a large number of regions.

Accordingly, the call forwarding service provided by the conventional private branch exchange system is not limited to a company to associate with the above-mentioned 080 incoming call exclusive line, for example, a franchise company operating a private branch exchange system when requesting connection of a moving center Regardless of the location of the subscriber requesting the call forwarding to the corresponding company, selects a phone number registered in the table and provides the call forwarding service to the subscriber requesting the call connection, so that the subscriber connected to the subscriber requesting call forwarding There is a problem in that the service required by the subscriber can not be normally provided due to the local location difference.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a system and method for designating a call originating from a specific area to be input to a specific port of a PABX system, And a plurality of external telephone numbers are stored in table numbers in each extension number which is not used as an extension number in the private branch exchange system so that any subscriber subscribed to the service provision through the PSTN network can arbitrarily The subscriber who is in the vicinity of the subscriber who requested the subscription service according to the CO line requested for the subscription service is connected to the subscriber who is in the vicinity of the subscriber, To be provided.

1 is a block diagram of a configuration of an external call forwarding apparatus in a private branch exchange system according to the present invention,

2 is a flowchart of an embodiment for executing an external call forwarding method in a private branch exchange system according to the present invention.

Description of the Related Art

10: trunk connection circuit part 20: trunk line control part

30: announcement voice transmission / DTMF analysis circuit unit 40:

50: memory unit 60: extension terminal

According to another aspect of the present invention, there is provided a PABX system, which is connected to a PSTN network via a dedicated port and a dedicated port, wherein each of the dedicated ports is set to receive only a call originated from a specific area A CO line connection means for designating a group indicating a specific area for each of the incoming ports;

A trunk line control means for notifying the lower-level device whether or not call connection through the incoming port is performed and for controlling call connection to the call number in response to the call forwarding request;

DTMF analysis means for transmitting an input request of a telephone number to be forwarded when a call is connected to an arbitrary subscriber through the call-only dedicated port to a voice message and analyzing a DTMF digit inputted according to the transmitted message; ;

A memory unit for setting a trunk of the incoming port and a specific subscriber group and a telephone number for each group as a table;

A call connection number of a subscriber to which a called subscriber requests call forwarding is detected from a table of the memory means according to the analyzed DTMF digits or a call connection is requested through the trunk line connection means to request an incoming call And an extension control means for connecting to the subscriber terminal.

According to the present invention having the technical features as described above, when a call connection request is detected from the PSTN through a dedicated port, a call is connected and then an input request of a telephone number desired to be called is transmitted as a voice message, And determines whether the digit value analyzed is a currently used extension number. If the extracted extension number is an extension number, it calls a corresponding extension terminal to make a call connection. If the extension number is not an extension number, Search for a group that points to a specific area.

The call number of the company located closest to the subscriber who requested call forwarding from the table set in the memory means according to the group number indicating the searched specific area and the number of the analyzed digits, And connects the call through the call-only dedicated port to connect the call, and then establishes a call connection with the subscriber terminal requesting call forwarding.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1, the external call forwarding apparatus of the PABX system includes a CO line connection circuit unit 10, a CO line control unit 20, a guidance voice transmission / DTMF analysis circuit unit 30, an extension control unit 50 And a memory unit 50. The trunk line connection circuit unit 10 is connected to each port through a dedicated line for call incoming and a dedicated line connected to the PSTN network and is connected to an arbitrary subscriber through a PSTN network, And a call forwarding request signal to an arbitrary telephone number is detected and applied to the trunk line control unit 20 side, and a call forward call connection request to the corresponding subscriber is transmitted to the trunk line control unit 20 in response to a request from the subscriber, To the PSTN network.

The CO line connection circuit unit 10 is set such that a call connection request signal transmitted from a specific area, that is, a station number managed by a telephone station located in the area, is input to a designated specific port, As shown in FIG.

The CO line control unit 20 forms a call connection when a call connection request signal for call forwarding is detected from an arbitrary subscriber. The CO line control unit 20 controls the CO line connection to the business that requested call forwarding and the CO line connection between the connected business and the call forwarding requesting subscriber .

When a call connection is established with an arbitrary subscriber through a dedicated line, the announcement voice transmission / DTMF analysis circuit unit 30 accesses the message data for inputting a phone number desired to be called by the subscriber and transmits the message data to the call line side connected to the call , Analyzes digits of a DTMF signal input from a subscriber connected to the call according to the transmitted voice message, and outputs the analyzed result to the extension controller 40 side. The extension controller 40 determines whether the digit information is used as an extension number. If the extension information is used as an extension number, the extension controller 40 connects the extension terminal 60. If the extension information is not used as an extension, And outputs the accessed result to the line control section 20 side. The memory unit 50 is configured in a table form with the number of the individual and each company subscribed to the company providing the franchise service as an index, as shown in Table 1 below.

Table 1

Extension A Group 1 External phone number 1 Group 2 Outside phone number 2 Group 3 External phone number 3 Group 4 External phone number 4 Extension B Group 1 Outside phone number 5 Group 2 External phone number 6 Group 3 External phone number 7 Group 4 Outside phone number 8 . . . Extension C Group 1 Outside phone number 9 Group 2 External phone number 10 Group 3 Outside phone number 11 Group 4 External phone number 12

The operation of providing the call forwarding service in the private branch exchange system according to the present invention having the above-described functions will be described with reference to FIG.

When a call connection request signal for switching the CO line from the arbitrary subscriber connected to the PSTN network through the call reception dedicated line is detected by the CO line control unit 20 through the arbitrary CO line port of the CO line connection circuit unit 10 at step S101, , The CO line control unit 20 connects the corresponding port according to the detected call connection request signal to form a call path and then notifies the voice transmission / DTMF analysis circuit 30 ).

At this time, the guidance voice transmission / DTMF analysis circuit unit 30 accesses the set voice message data, for example, " Enter the telephone number to which a call is desired ". To the subscriber side connected to the call (S102).

Upon detection of a DTMF signal input from a call-connected subscriber according to the transmission of a message requesting telephone number input as described above, the CO line control unit 20 detects the DTMF signal and transmits the DTMF signal to the guidance voice transmission / DTMF analysis circuit unit 30 via a data bus Lt; / RTI >

The DTMF analysis circuit 30 analyzes each digit of the input DTMF signal and then applies the analyzed result to the extension control unit 40 side (S103). The extension control unit 40 determines whether the analyzed digit is the current extension It is determined whether or not the number is allocated and used (S104).

In the case where the digits input from the subscriber connected in the call connection and analyzed are the currently used extension numbers, the extension control unit 40 calls the corresponding extension terminal 60, When the analyzed digit is not the current extension number, the group is designated for each port so that only the station number managed by each telephone station is assigned to each port of the incoming dedicated line. Therefore, And searches for a call-connected originating group from the trunk line (S106).

Upon completion of the search of the call-connected originating group, the calling group number and the telephone number input by the subscriber terminal in the DTMF are searched from the subscriber number table set in the memory unit 50, The call number for call forwarding is detected to the corresponding type of worker located closest to the user (S107).

When a call number for call forwarding is detected, the extension control unit 40 applies the detected result to the trunk line control unit 20 side. The trunk line control unit 20 controls the trunk line control unit 20 according to the received call number, And connects the call to the outside, and then connects the call forwarding requestor with the outside call (S108).

When an on-hook signal for blocking call connection is detected from any other party while the call is maintained through the call connected through the call forwarding, the call control unit 20 controls the call connection circuit unit 10 The dedicated port for incoming call and the dedicated port are reset to form a state of waiting for a call connection request.

Hereinafter, an operation of the call forwarding as described above will be described as an example.

The area under the control of an arbitrary telephone station A is referred to as "A", the area under the control of the telephone station B is referred to as "B", and each area has a moving center, for example, In this case, the "A" area managed by the telephone company A is designated as group 1, and only an arbitrary port is designated as the area to be controlled by the telephone company A. In addition, The telephone number of the moving center located in the area "A" in the group 1 2424 is set as the index of the group number and "2424" in the call forwarding table of the memory unit 50 to the moving center 2424 of the group 2 in the " And sets the telephone number of the user.

As described above, when a telephone number of a telephone number connected to a call destination port and a telephone number of a moving center located in a group number area are set and a subscriber of the PSTN network located in the " A " The call between the private branch exchange system and the subscriber requesting the call forwarding is detected when the call connection request is detected by the trunk line control unit 20 through an arbitrary port of the trunk connection circuit unit 10, A voice message which is applied to the DTMF analysis circuit unit 30 and requests input of a telephone number desired to be received is transmitted to the subscriber terminal side.

At this time, if the user of the subscriber terminal inputs a specific number to be forwarded according to a voice message, the DTMF analysis circuit part analyzes the DTMF digits of the specific number and inputs the DTMF digits to the extension control part 40.

In this case, if the analyzed specific number is a currently assigned and assigned number, the extension control unit 40 calls the corresponding extension terminal 60 to connect a call between the subscriber terminal requesting call connection and the extension terminal 60 , It is possible to detect that the originating group is "1" because the CO line that is received due to the detection of the connected port is the "A" region, and therefore, the telephone number 2424 input from the table set in the memory unit 50 And then connects the call connection to the subscriber terminal requesting the call forwarding and connects the call connection.

As described above, according to the present invention, since a subscriber terminal requesting a call forwarding service through an intelligent network connects to a company located closest to an area where a terminal requesting a service is located, reliability of providing a call forwarding service is improved And each service provider can allocate a plurality of external call numbers to a specific number that each of the registrants prefers to be easy to associate with the industry, thereby increasing the efficiency of service provision.

Claims (2)

In a PABX system, a PSTN network is connected through a call-only port and a call-only port, and each of the call-only ports is set to receive only a call originated from a specific area, and a specific area is displayed for each call- A trunk connection means to which a group to be connected is designated; A trunk line control means for notifying the lower-level device whether or not call connection through the incoming port is performed and for controlling call connection to the call number in response to the call forwarding request; DTMF analysis means for transmitting an input request of a telephone number to be forwarded when a call is connected to an arbitrary subscriber through the call-only dedicated port to a voice message and analyzing a DTMF digit inputted according to the transmitted message; ; A memory unit for setting a trunk line of the incoming port and a specific business group and a telephone number for each group as a table; A subscriber having a connection to the extension terminal according to the analyzed DTMF digits or detecting a calling number of a company requesting call forwarding from a table of the memory means and making a call connection through the trunk line connection means, And an extension control unit connected to the terminal. A call switching method of a private branch exchange system, comprising the steps of: connecting a call when a call connection request is detected from a PSTN through a dedicated port, and transmitting an input request of a telephone number to be called to a voice message; Analyzing a digit input as a DTMF signal according to a voice message transmitted in the process, and determining whether the digit value analyzed is a currently used extension number; If the extension number is an extension number, calling a corresponding extension terminal to make a call connection; searching for a group indicating a specific area through an incoming port if the extension number is not an extension number; Accessing a call number of a company located closest to a subscriber requesting call forwarding from a table set in a memory means according to a group number indicating the searched specific area and a number of analyzed digits; And connecting a call connection to a subscriber terminal requesting call forwarding after connecting a call connection through a call-only port according to the accessed call number, and establishing call forwarding connection with the subscriber terminal requesting call forwarding.