JPH0832080B2 - Economic route selection method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an economic route selection method in a PABX accommodating an ISDN line.

Conventional technology Economic route selection is a type of service that automatically selects and connects the line with the lowest communication charge when making outbound calls to the out-of-town area when there are multiple communication lines.
(Least cost routing) is abbreviated. LCR function is PAB
It is preset in X (Private automatic branch exchange) software.

FIG. 4 shows the structure of a PABX having an LCR function.
In FIG. 4, 41 is a PABX, 42 is an extension telephone accommodated in the PABX 41, 43 is a similar data terminal, 44 is an ISDN line of a type 1 telecommunications carrier applicable to LCR, and 45 is an extension telephone 42. The terminal control unit 46 controls the data terminal 43, and the line control unit 47 controls the ISDN line 44. 48 is an extension telephone 42 or a data terminal 43 and an ISDN line
Call path switch to pass voice and data between 44, 49 is PA
Central processing unit that controls the entire BX41, 50 is the central processing unit 49
Is a memory for operating. The memory 50 has a PABX
Various line data for operating the 41 and judgment data indicating whether or not to apply the LCR as the system of the PABX 41 are stored.

FIG. 5 shows a connection form between the PABX 41 and the central office. In FIG. 5, 41 is a PABX, 42 is an extension telephone, and 43
Is a data terminal, 44 is an ISDN line, 51 is an existing type 1 telecommunications carrier central office switch, 52 is a new type 1 telecommunications carrier central office switch, and 53 is an existing type 1 telecommunications carrier. It is a gateway switch that connects the central office switch 51 of the present invention and the new central office switch 52 of the first telecommunications carrier.

Next, the operation of determining whether to apply the LCR to the station line transmission will be described with reference to FIG. First, PABX41
From the extension telephone 42 or extension terminal such as terminal data 43 to IS
When the dial signal for capturing the DN line 44 is received (step 61), it is determined whether or not the LCR is applied as the system of the PABX 41 using the determination data stored in the memory 50 in the PABX 41 (step 62). ). If LCR is applied as a result of the judgment, the dial data input by the extension terminal is accumulated, the area code is judged, and the access number of the new type 1 telecommunications carrier is added to the beginning of the number. Then, the data is sent to the central office 51 of the existing type 1 telecommunications carrier. As a result, the existing type 1 telecommunications carrier's central office switch 51 sends the partner number to the new type 1 telecommunications carrier's central office switch 52 via the barrier exchange 53 (step 6).
3). As a result of the judgment, if the system is not applied, the partner number received from the extension terminal is sent as it is to the ISDN network of the existing type 1 telecommunications carrier (step 64).

As described above, conventionally, the determination as to whether to apply the LCR has been made based on the determination data stored in the memory of the PABX.

Problems to be Solved by the Invention However, in the existing ISDN network of NTT, which is an existing type 1 telecommunications carrier, a process for realizing various services such as a call mode, a digital communication mode, an H system mode, and a packet mode. Since there is a system and the equipment on the side of the new type 1 telecommunications carrier has not caught up with it, the connection between carriers is regulated except for the call mode. Therefore, if the above conventional LCR selection method is directly applied to the current ISDN network, the caller cannot be connected to the new type 1 telecommunications carrier in the digital communication mode, H system mode, packet mode, etc. There was a problem that the call was disconnected.

The present invention solves such a conventional problem, and the LCR can be used even in a digital communication mode other than the call mode.
It is intended to provide an LCR selection method to which can be applied.

Means for Solving the Problems In order to achieve the above object, the present invention determines whether or not to apply economic route selection when a PABX captures an ISDN line and makes a transmission, according to the transmission capability of an outgoing call. It is something that is done.

The transfer capability is the type of call defined by the transfer capability information element shown in TTC standard JT-Q931 “ISDN User / Network Interface Layer 3 Specification”.

Effect Therefore, according to the present invention, the transmission capacity is defined in the line setting of each extension terminal of the PABX, and it is determined whether or not the LCR is applied for each transmission capacity, so that the ISDN network side even prepares the equipment. Then, the LCR can be automatically applied in a digital communication mode other than the call mode.

Example Hereinafter, an example of the present invention will be described. FIG. 1 is a flow chart showing an economic route selection operation in one embodiment of the present invention, and FIG. 2 shows a configuration of a PABX having an LCR function.

First, in FIG. 2, 21 is a PABX, 22 is an extension telephone housed in the PABX 21, 23 is a similar data terminal, 24 is an ISDN line of a type 1 telecommunications carrier applicable to LCR, and 25 is an extension telephone 22. Is a terminal control device for controlling the data terminal 23, and 27 is a line control device for controlling the ISDN line 24. 28 is an extension telephone 22 or a data terminal 23
A speech path switch for passing voice and data to and from the ISDN line 24, a central processing unit 29 for controlling the entire PABX 21, and a memory 30 for operating the central processing unit 29. Memory 30
Includes various line data for operating the PABX21 and
Judgment data indicating whether or not to apply LCR as a PABX21 system is stored.

FIG. 3 shows the connection between the PABX 21 and the central office. In FIG. 3, 21 is a PABX, 22 is an extension telephone, and 23
Is a data terminal, 24 is an ISDN line, 31 is an existing type 1 telecommunications carrier central office switch, 32 is a new type 1 telecommunications carrier central office switch, and 33 is an existing type 1 telecommunications carrier. It is a gateway switch that connects the central office switch 31 and the new central office switch 32 of the first telecommunications carrier.

Next, the operation of determining whether to apply the LCR to the station line transmission will be described with reference to FIG. First, PA
Memory capacity of PABX21 is used to determine whether or not LCR is applied to each line capacity of extension terminals 22 such as BX21 and extension terminals such as data terminal 22, and the LCR is applied for each of the communication capabilities.
Store it inside.

The transfer capability is the type of call defined by the transfer capability information element shown in TTC standard JT-Q931 "ISDN user / network interface layer 3 specifications", and is classified as follows.

Circuit switching Call mode Voice 3.1kHz audio Digital communication mode Unlimited digital 64kbps H system mode Unlimited digital 384kbps Unlimited digital 1536kbps Packet switching packet mode PABX21 captures ISDN line 24 from an extension terminal such as extension telephone 22 or terminal data 23 When the dial for receiving is received (step 11), it is judged whether the LCR is applied as the system of the PABX21 using the judgment data stored in the memory 30 in the PABX21 (step 12). As a result of the determination, when applying LCR, first, the transfer capability of the calling terminal is extracted (step 13), and then whether LCR is applied to the call mode of the transfer capabilities (step 14),
Whether the LCR is applied to the digital communication mode (step 15) and whether it is applied to the packet mode (step 16) are sequentially determined, and if the LCR is applied to each, the dial input from the extension terminal is input. The data is accumulated, the toll number is determined, the access number of the new type 1 telecommunications carrier is added to the head of the number, and the number is sent to the central office 31 of the existing type 1 telecommunications carrier. As a result, the existing type 1 telecommunications carrier's central office switch 31 sends the other party's number to the new type 1 telecommunications carrier's central office switch 32 via the barrier exchange 33 and puts it on the ISDN network ( Step 17). If the result of the determination is that LCR is not applied, the other party's number received from the extension terminal is sent as it is to the exchange 31 of the existing type 1 telecommunications carrier (step 18), and the existing type 1 telecommunications carrier is used. The local exchange 31 determines the destination within the own ISDN network.

As described above, according to the above embodiment, the LCR is applied only to the outgoing call in the call mode according to the transmission capability of the outgoing call, and the outgoing call in the other modes is the normal outgoing call.
You can automatically sort with 21. Also, the setting value of whether to apply LCR is that for the time being, LCR is not applied to outgoing calls other than the call mode, but when the equipment of the new Type 1 telecommunications carrier has been enhanced, the setting value is set. By changing, without changing the processing program,
LCR can be applied even in the digital communication mode.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiment, the present invention applies LCR only to outgoing calls in the call mode according to the transmission capability of outgoing calls, and outgoing calls in other modes are normal outgoing calls. Since the PABX can automatically distribute the call, the caller simply dials the other party's number without paying attention to the transfer capability of the terminal itself, and the PABX automatically selects the optimal economic route according to the transfer capability of the call. It becomes possible to reduce the call / communication charges.

[Brief description of drawings]

FIG. 1 is an operational flowchart of an economic route selection method showing an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a PABX in the embodiment, and FIG. 3 is a PABX in the embodiment.
Fig. 4 is a block diagram showing the configuration of a conventional PABX, and Fig. 5 is a conventional PABX.
And FIG. 6 is a block diagram showing a connection form between the switchboard and the central office, and FIG. 6 is an operation flowchart showing a conventional economic route selection method. 21 …… PABX, 22 …… extension telephone, 23 …… data terminal, 24
...... ISDN line, 25, 26 ...... Terminal control unit, 27 ...... Line control unit, 28 ...... Call path switch, 29 ...... Central processing unit,
30 …… Memory, 31 …… Existing type 1 telecommunications carrier central office switch, 32 …… New type 1 telecommunications carrier central office switch, 33 …… Gate switch.

Claims (1)

[Claims] 1. An economic route selection method for determining whether or not to apply economic route selection when a PABX accommodating an ISDN line captures and sends an ISDN line according to the transmission capability of an outgoing call.