JPH03210893A - Bypass system from relay line to trunk line - Google Patents

Abstract

PURPOSE:To receive a call to a desired extension directly independently of kinds of communication by providing an extension number transfer means transferred to other private branch exchange via an integrated service digital communication network to a private branch exchange and allowing the other private branch exchange to apply incoming call processing to a called extension based on an extension number of the called extension transferred while being added to a call setting request when the call setting request reaches. CONSTITUTION:Since a trunk line number conversion means 200 connects an extension 7 to an extension 8 via a relay line network 100, a relay line station number DN2 and an extension number DN8 are dialed and connection is disabled to other private branch exchange 2 via the relay line network 100, an extension number transfer means 300 adds the extension number DN8 dialed by the caller extension line 7 to a call setting request generated by the trunk line number conversion means 200 and the result is transferred to the other private branch exchange 2 via an integrated service digital communication network 4. When the call setting request reaches from the private branch exchange 1 to the other private branch exchange 2 via the integrated service digital communication network, the private branch exchange 2 applies incoming processing to the called extension 8 based on the extension number DN8 transferred added to the call request.

Description

[Detailed Description of the Invention] [Summary] Regarding a detour method from a trunk line to a central office line in a private branch exchange accommodated in a trunk line network and an integrated services digital communication network, the present invention also provides the following method when detouring to an integrated services digital communication network. Regardless of the type of communication (the purpose is to be able to receive calls directly to the desired extension; in order for an extension housed in a private branch exchange to connect to an extension housed in another private branch exchange via a trunk line network) , when dialing the trunk station number given by another private branch exchange or trunk network and the extension number of the called extension, the caller cannot connect to another private branch exchange via the trunk network. The other private branch exchange converts the trunk station number dialed by the call extension into the central office line number assigned by the general service digital communication network, and sends a call setup request with the central office line number as the called party number to the general service digital communication network. The central office line number converting means to transmit and the extension number of the called extension dialed by the calling extension are added to the call setting request generated by the central office line number converting means, and the call setting request is sent to another premises via the comprehensive service digital communication network. A private branch exchange is equipped with an extension number transfer means that transfers an extension number to the exchange, and when a call setup request is received from the private branch exchange via the service integrated digital communication network, the other private branch exchanges add it to the call setup request and forward it. The system is configured to perform incoming call processing on the called extension based on the extension number of the called extension.

[Industrial application field]

The present invention provides a trunk line network and a comprehensive service digital communication network (
This invention relates to a detour method from a trunk line to a central office line in a private branch exchange accommodated in ISDN.

When multiple private branch exchanges are accommodated in a trunk line network consisting of private lines, etc. and a public communication network, and it is not possible to connect to other private branch exchanges via the trunk line network, public communication A bypass service that bypasses the network and connects to another private branch exchange via the public communication network from a trunk line to a central office line is provided under the name of busy advance service.

[Conventional technology]

FIG. 4 is a diagram showing an example of a communication network to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional private branch exchange, and FIG. 6 is a diagram showing an example of a conventional private branch exchange, and FIG. It is a figure which shows an example of the detour process.

In FIG. 4, private branch exchanges (PBX) 1 and 2 are
It is connected by a trunk line 3, and is also connected to a private branch exchange (P
BX)l is accommodated in the Integrated Services Digital Network (ISDN) 4 via a central office line 5, and is also connected to a private branch exchange (PBX).
X) 2 is also accommodated in the integrated service digital communication network (I5DN) 4 via the central office line 6.

The private branch exchange (PBX) 2 is assigned the number ``82'' as the trunk line station number DNt for incoming calls via the trunk line 3, and is also assigned the number ``82'' as the trunk line station number D N t for receiving calls via the trunk line 3.
It is assumed that r044-433-8114J is assigned as the central office line number DN for incoming calls from DN) 4 to central office line 6.

4 to 6, an extension 7 accommodated in a private branch exchange (PBX) 1 is an extension 8 accommodated in a private branch exchange (PBX) 2 and assigned the number "3456" as the extension number D N s. , a call is made to connect via trunk line 3, and trunk line station number DN2 of private branch exchange (PBX) 2 is made.
= r81J and extension number DNa ``” '3 of extension 8
If you dial 456J in sequence, you will be connected to a private branch exchange (PBX).
)l, the central controller (CC) 12 detects a call from extension 7 using a known method, and the digit reception processor 121 sends the six-digit number r813456J sent from extension 7 to the subscriber circuit (LC). ) 14, Network (NW) 11
and is sequentially received via the signal transmitting/receiving device (SSR) 15 (step 511 in FIG. 6), and analyzes the trunk line station number DN2 (step S12).

First, the numeric reception processing unit 121 stores the main memory (MM) 13.
Refer to the first digit analysis table (DAI) 131 in
2 storage position a1° is detected and the second numerical analysis table (DA2
) 132, and then the storage position a133 of the third digit analysis table (DA3) 133 using the second digit rlJ received.
is detected and the third numerical analysis table (DA3) 133 is referred to.

In the third numerical analysis table (DA3) 133, the trunk line station number D
N2 = Call type of originating call by r81J r = trunk line originating call, number of digits in trunk station number m = "2 digits J, private branch exchange (
The normalized station number n assigned to the PBX) 2 for internal processing is stored.

The digit reception processing unit 121 generates a third digit analysis table (DA3) 1
33 is an outgoing call to the trunk line 3 (step 513), and if it is not an outgoing call to the trunk line 3, the process corresponding to the received number is executed (step 513). 514), after confirming that the call type r indicates an outgoing call to trunk line 3, the third digit analysis table (DA3) 1
According to the number of digits m of the trunk station number extracted from 33 = "2 digits", of the received six-phase number r813456J, the first two fingers "81J" is the trunk station number DN2, and the remaining four digits r3456
Step S, 15) Separate J from extension number D N m.
, respectively, are stored in the numeric storage area (DR) 134 (step 516).

Next, the central control unit (CC) 12 transmits the trunk line station number DN.
2 = The vacant trunk line 3 determined by r81J is selected using a known method (step 517), and if the vacant trunk line 3 is selected (step 518), the call processing to the vacant trunk line 3 is performed using a known method. Execute (step 519)
, if all trunk lines 3 are in use (step 518)
, the detour information registration area (AN
) 135, and the station line originating identification number (for example, number "0") and station line number D that are registered in advance corresponding to the normalized station number n extracted from the third numerical analysis table (DA3) 133.
Ns=r044 433 8114" is extracted (step 520), the vacant office line 5 is selected by a known method, a call setting message is created and selected with the extracted office line number DNe=r044 433 8114J as the called number. Integrated Service Digital Network (ISDN) via central line 5
) 4 (step 521).

The Integrated Services Digital Network (ISDN) 4 receives the called number = central office line number DNa = r included in the call setup message received from the private branch exchange (PBX) l via the central office line 5.
044 433 8114", select central line 6,
Conveys call setup messages.

In the private branch exchange (PBX) 2, when a call setting message arrives from the central office line 6, the incoming call is displayed on a predetermined receiving terminal (ATT) 9 using a known method.

When the operator of the reception terminal (ATT) 9 responds to the incoming call from the central office line 6 and the call setup between the calling extension 7 and the reception terminal (ATT) 9 is completed, the calling extension 7 returns to the reception terminal (ATT). If you wish to talk to the called extension 8 to the operator of ATT) 9, call the reception terminal (
The operator of the ATT 9 transfers the incoming call from the central office line 6 to the called extension 8 using a known method, and when the called extension 8 answers, it announces the incoming call from extension 7 and completes the transfer.

As a result of the above, the calling extension 7 can communicate with the desired called extension 8.

[Problem to be solved by the invention]

As is clear from the above explanation, in the conventional detour method from trunk lines to central office lines, when a call bypasses the integrated services digital network (ISDN) 4 and arrives at the private branch exchange (PBX) 2, it is always necessary to The calling extension 7 verbally requests the operator of the receiving terminal (ATT) 9 to receive the call to the desired called extension 8, and the receiving terminal (A
When the operator of TT) 9 performs a transfer operation, the call is transferred to the desired extension 8, and the call cannot be received directly to extension 8 as if it were routed through trunk line 3, especially in the case of data communication that does not involve voice calls. Since it is not possible to request the operator of the reception terminal (ATT) 9 to transfer the call to the desired extension by voice, it is not possible to detour to the integrated service digital communication network (I5DN) 4, and the communication that can be detoured to the central office line is limited. However, there were problems that impaired the economic efficiency and convenience of the communication system.

SUMMARY OF THE INVENTION An object of the present invention is to enable a call to be directly received at a desired extension, regardless of the type of communication, even when the call is detoured to an integrated service digital communication network.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, l is a private branch exchange, 2 is another private branch exchange, 4 is an integrated service digital communication network in which private branch exchanges 1 and 2 are accommodated, 7 is an extension accommodated in private branch exchange l, and 8 is another private branch exchange. 100 is a trunk line network in which private branch exchanges 1 and 2 are accommodated; 200 is a central office line number conversion means provided in private branch exchange 1;

DN 2 is the trunk station number assigned to the other private branch exchange 2 by the trunk line network 100, DN s is the extension number of extension 8, and DN s is the trunk station number assigned to the other private branch exchange 2 by the service integrated digital communication network 4. This is the central office line number assigned by.

300 is an extension number transfer means provided in the private branch exchange 1 according to the present invention.

[Effect]

The office line number converting means 200 dials the trunk line station number DN and the extension number D N a in order to connect the extension line 7 to the extension line 8 via the trunk line network 100, and as a result, the trunk line number converting means 200 converts the trunk line number DN into the trunk line network 1.
If it is not possible to connect to another private branch exchange 2 via 00,
The trunk line station number DN2 dialed by the calling extension 7 is converted to the central office line number DN, and a call setting request with the central office line number DNs as the called number is transmitted to the comprehensive service digital communication network 4.

The extension number transfer means 300 adds the extension number DNs dialed by the calling extension 7 to the call setting request generated by the office line number conversion means 200, and transfers it to another premises via the integrated service digital communication network 4. Transfer to exchange 2.

When a call setup request arrives from the private branch exchange 1 via the integrated service digital communication network 4, the other private branch exchange 2 receives an extension number D N that is added to the call setup request and transferred.
Based on s, incoming call processing is performed on the called extension 8.

Therefore, even if it becomes impossible to connect to another private branch exchange via the trunk line network and the call is detoured to the integrated service digital communication network, it is possible to receive the call directly to the desired extension. It becomes possible to provide a detour service from the trunk line to the central office line regardless of the situation, and the economic efficiency and convenience of the communication system are greatly improved.

[Example〕 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a private branch exchange according to an embodiment of the present invention, and FIG. 3 is a diagram showing an example of detour processing from the trunk line to the central office line in FIG. Codes indicate the same objects. In addition, the target communication network is the 4th
As shown in the figure.

In FIG. 2, a trunk line 3 connecting private branch exchanges (PBX) 1 and 2 as the trunk line network 100 in FIG.
is shown, and the station line number conversion means 200 in FIG.
As a detour information registration area (AN) 135 is a private branch exchange (
The incoming extension number processing unit 123 is provided in the main memory (MM) 13 of the private branch exchange (PBX) 1, and the incoming extension number processing unit 123 is provided in the central control unit (CC) 12 of the private branch exchange (PBX) 1 as the extension number transfer means 300 in FIG. It is provided.

In Figures 2 to 4, a private branch exchange (PBX)
Extension 7 accommodated in Private Branch Exchange (PBX) 1 makes a call to extension 8 accommodated in Private Branch Exchange (PBX) 2 to connect via trunk line 3, and the trunk line station number DN2 of Private Branch Exchange (PBX) 2 is called.
= r 81 J and extension number DNs of extension 8 = r
3456" in sequence, a private branch exchange (P
In BX)l, the central control unit (CC) 12 detects a call from extension 7 using a known method, and sends a digit reception processing unit 121
The six-phase number r813456 sent from extension 7 by
J, subscriber circuit (LC) 14, network (NW)
11 and the signal transmitting/receiving device (SSR) 15 (step 531 in FIG. 3), trunk line station number DN2.
(step 532).

First, the numeric reception processing unit 121 stores the main memory (MM) 13.
Refer to the first digit analysis table (DAI) 131 in
2 storage position a13□ is detected and the second numerical analysis table (DA
2) Referring to 132, the storage position a13 of the third digit division (DA3) 133 is determined by the second digit “l” received subsequently.
3 is detected and the third digit analysis table (DA3) 133 is referred to.

The digit reception processing unit 121 generates a third digit analysis table (DA3) 1
33 is an outgoing call to the trunk line 3 (step 533), and if it is not an outgoing call to the trunk line 3, the process corresponding to the received number is executed (step 533). 534), after confirming that the call type r indicates an outgoing call to trunk line 3, the third digit analysis table (DA3) 1
According to the number of digits m of the trunk station number extracted from 33 = "2 digits", the first two fingers "81" of the received six-phase number r813456 are designated as the trunk station number DN2, and the remaining four digits r3456.
step 535) to separate J from the extension number DN a;
Each is stored in the numeric storage area (DR) 134 (step 536).

Next, the central control unit (CC) 12 transmits the trunk line station number DN.
2 = r 81 J is selected by a known method (step 537), and if the vacant trunk line 3 is selected (step 538), a call is made to the vacant trunk line 3 by a known method. The process is executed (step 53
9), if all trunk lines 3 are in use (step 53
8), the detour information registration area (
Refer to AN) 135, Third Numerical Analysis Table (DA3) 13
The station line originating identification number (for example, "0" number) registered in advance corresponding to the normalized station number n extracted from 3, the station line number DNs=r044 433 8114J, and the public housed by the station line 5. The network type p indicating whether the communication network is an integrated service digital network (ISDN) 4 is extracted (step 540), but the extracted network type p does not indicate an integrated service digital network (ISDN) 4. If (step 841), the vacant office line 5 is
Select and extract the office line number DNs = r 044-4
A call setup message with 33-8114J as the called party number is created and sent to the integrated services digital network (ISDN) 4 via the selected central office line 5 (step 542).
.

On the other hand, network type p is integrated service digital communication network (IS).
DN) 4 (step 541)
, the number storage area (DR) is stored by the incoming extension number processing unit 123.
) 134. At step 543), the extension number DNs=r3456J is extracted from
SDN) 4 (step 544).

The integrated services digital network (ISDN) 4 receives the called number = central office line number DNe = r included in the call setup message received from the private branch exchange (PBX) l via the central office line 5.
044 433 8114", select central line 6,
A call setup message containing extension number DNi=r3456J as the destination subaddress is transmitted.

When a call setup message arrives from the central office line 6, the private branch exchange (PBX) 2 extracts the extension number DNs ``r3456J'' included as the destination subaddress, and uses a known method to specify the extension number DNs=r3456. An incoming call is displayed on extension 8.

When extension 8 responds, call setup between extensions 7 and 8, bypassing Integrated Services Digital Network (ISDN) 4, is completed.

Thereafter, extensions 7 and 8 can perform any communication such as voice communication and data communication via the set call.

As is clear from the above explanation, according to this embodiment, since the trunk line 3 is in use, the integrated service digital communication network (I
Even if the call bypasses the private branch exchange (PBX) 2 and bypasses the private branch exchange (PBX) 2, the extension number DN is transferred to the private branch exchange (PBX) 2 as the called subaddress, and
)2 is the called subaddress (=extension number DNs ” r34
56J), the reception terminal (
There is no need for the operator of ATT) 9 to make a call, and data communication without any voice calls can be performed without any problems, and all communication between private branch exchanges (PBXs) 1 and 2 is now possible. It becomes possible to provide a detour service to the central office line.

Note that FIGS. 2 to 4 are only one embodiment of the present invention, and for example, the trunk line network 100 connecting private branch exchanges (PBXs) 1 and 2 is limited to the trunk line 3. Although many other modifications may be considered, such as a relay switching network that passes through another private branch exchange, the effects of the present invention remain the same in any case.
The PBX) 1 and the communication network are not limited to those shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

〔Effect of the invention〕

As described above, according to the present invention, even if the communication network becomes unable to connect to another private branch exchange via the trunk line network and is detoured to the comprehensive service digital communication network, it is possible to receive a call directly to a desired extension. Therefore, it becomes possible to provide a bypass service from the trunk line to the office line regardless of the type of communication such as voice communication or data communication, and the economic efficiency and convenience of the communication system are greatly improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a diagram showing a private branch exchange according to an embodiment of the invention, and Fig. 3 is an example of a detour process from a trunk line to a central office line in Fig. 2. 4 is a diagram showing an example of a communication network to which the present invention is applied, FIG. 5 is a diagram showing an example of a conventional private branch exchange, and FIG. 6 is a diagram showing a detour from the trunk line to the central office line in FIG. It is a figure which shows an example of a process. In the figure, 1 and 2 are private branch exchanges (PBX), 3 is a trunk line, and 4 is an integrated services digital network (ISDN).
), 5 and 6 are office lines, 7 and 8 are extension lines, 9 is reception terminal (ATT), l l is network (NW), 12
is the central control unit (CC), 13 is the main memory (MM)
, 14 is a subscriber circuit (LC), 15 is a signal transmitting/receiving device (
SSR), 16 is trunk line trunk (TRK), l 7
is central office trunk (COT), l OO is trunk line network, 1
21 is a number reception processing unit, 122 is a number transmission processing unit, 12
3 is the incoming extension number processing unit, 131 is the first digit analysis table (D
AI), 132 is the second numerical analysis table (DA2), 133 is the third numerical analysis table (DA3), 134 is the numerical accumulation area (D
R), 135 is the detour information registration area (AN), 200 is the station line number conversion means, 3 inventions: Yo, Mizouchi 4 wells, Figure 2 (2nd station + connecting line 715 stations) Detour to the line, processing chart conventional h5 Hisashi Mizouchi hat Iso daichi

Claims (1)

[Scope of Claims] The networks are accommodated in a trunk line network (100) and an integrated service digital communication network (4), respectively, and are mutually connected via the trunk line network (100) or the integrated service digital communication network (4). In a possible plurality of private branch exchanges (1, 2), an extension (7) accommodated in the private branch exchange (1) is accommodated in another private branch exchange (2) via the trunk line network (100). In order to connect to the extension (8) called, the other private branch exchange (2) uses the trunk station number (DN_2) given by the trunk network (100) and the extension number (8) of the called extension (8). As a result of dialing DN_8), the trunk network (1
00), the other private branch exchange (2) receives the trunk station number (DN_2) dialed by the calling extension (7). It is converted into the office line number (DN_6) given by the integrated service digital communication network (4), and the office line number (DN_6) is
central office line number conversion means (20
0) and the called extension (8) dialed by the calling extension (7).
The extension number (DN_8) of the office line number converting means (2
The private branch exchange (300) adds an extension number transfer means (300) to the call setting request generated by the private branch exchange (00) and transfers it to the other private branch exchange (2) via the integrated service digital communication network (4). 1), and the other private branch exchange (2) adds information to the call setup request when the call setup request is received from the private branch exchange (1) via the integrated service digital communication network (4). The extension number (DN_8) of the called extension (8) to be transferred
A detour method from a trunk line to a central office line, characterized in that incoming call processing is performed on the called extension (8) based on the above.