JPH0654929B2 - Source address control method in ISDN public network - Google Patents

Description

DETAILED DESCRIPTION [Outline] Regarding an originating address control method in an ISDN public network, when the extension of the called side receives the originating address information from the public network when connecting from the public network to the extension of the PBX, ISDN PBX connected to the ISDN public network for the purpose of making it possible to identify whether it is from within the PBX and to make a return call from the receiving terminal in the PBX to the calling terminal on the public network side. ISDN public network to ISDN
When the PBX terminal receives a call, the PBX public network access number is added to the information of the calling address in the call setup message received from the ISDN public network by the PBX.
It is configured to have a function to put in the calling address of the call setting message sent to the receiving terminal of.

[Industrial application field]

The present invention relates to a source address control system in an ISDN public network, and more particularly to a connection between an ISDN public network and an ISDN PBX.

When connecting the ISDN public network and the ISDN PBX, it is required that the extension terminal in the PBX can be handled in the same manner as the terminal connected to the public network.

Before describing the conventional connection method between the ISDN public network and the ISDN PBX, the connection method in the ISDN public network will be described first with reference to FIGS. 10 to 12 in order to explain the ISDN number processing method. The same reference numerals denote the same parts throughout the specification.

In FIG. 10, 101 is an ISDN public network (CO), 102-105.
Are ISDN terminals (TE _a1 , TE _a2 , TE _b1 , TE _b2 ), respectively. ISD
In N, each subscriber can connect up to eight terminals to the bus provided to each subscriber. Each subscriber has a sub-address that identifies each subscriber's number as well as a terminal on each subscriber's bus.

In the example of FIG. 10, the subscriber A has the subscriber number #A and the subaddresses # and # for the terminals (TE _a1 , TE _a2 ) 102 and 103 on the bus of the subscriber A, and the subscriber B joins. Person number
In addition to #B, it has subaddresses #, # for terminals (TE _b1 , TE _b2 ) 104, 105 on the bus of subscriber B.

(I), (ii), (iii) and (iv) show signals (call setup message) for setting up a call. In the ISDN call setup message, there are four fields of address information, source address, source subaddress, destination address, and destination subaddress, and call setting is performed by setting appropriate information in these fields.

FIG. 11 is a diagram showing a call connection sequence in the public network.
FIG. 12 is a diagram showing the contents of the message at each stage of the public network connection sequence.

In FIG. 10, the call connection method will be specifically described with reference to FIGS. 11 and 12 by taking as an example the case where the terminal (TE _a1 ) 102 makes a call to the terminal (TE _b2 ) 105.

First, a person off- _hooks the terminal (TE _a1 ) 102 and
When calling E _b2 ) 105, the call setup message shown in (i) of FIG. 10 is set and sent to the ISDN public network (CO) 101 (FIG. 11). That is, the calling address is your subscriber number #
A, the originating sub-address is the sub-address of the terminal (TE _a1 ) 102,
The destination address is the subscriber number #B of the partner terminal, and the destination subaddress is the subaddress of the terminal (TE _b2 ) 105. The call setup message further includes call setup as a message type, as shown in FIG. 12 (a).

Upon receiving this call setup message, the public network (CO) 101 recognizes that the receiving terminal is #B, and sends the call setup message (ii) similar to that shown in FIG. 10 (i) to the subscriber #B. To the calling terminal (Fig. 11) and then to the calling terminal (Fig. 12).
(c)) It is sent to the originating terminal and the calling terminal displays the call (Fig. 11). Also, when the called terminal sends a calling message to the public network, it makes a ringing tone (Fig. 11).

Subscriber #B receives this message according to the prescribed procedure of ISDN, but since the called subaddress is #, the terminal
Only (TE _b2 ) 105 responded off-hook, FIG. 12 (b)
The response message shown in is transmitted to the public network (CO) 101 (first
(Fig. 1). The public network (CO) 101 sends this message to the calling terminal to stop the call display, and the terminal (TE _a1 ) 102
And the terminal (TE _b2 ) 105 are connected.

The sequence of disconnection, release, and release completion after the end of communication is performed by FIG. Disconnect, release,
And the contents of the release completion message are as shown in FIGS. 12 (e), (f) and (g).

With the connection in the public network described above, a return connection as described below is possible, which is extremely convenient for the user.

That is, if the calling address and the calling subaddress received at the time of an incoming call are stored in the storage device provided in the receiving terminal and the stored contents are displayed on the display or the like, not only the caller can immediately know, but It is possible to call the calling terminal by setting the calling address and the calling sub address to the called address and called sub address of the call setup message sent from the called terminal side, respectively.

However, in the connection system between the ISDN public network and the ISDN PBX, the return connection is not easy, as will be described later in detail.

[Conventional technology]

FIG. 13 shows a terminal (TE _b2 ) 105 of the ISDN public network in the conventional connection system between the ISDN public network and the ISDN PBX.
To a terminal (TE _a1 ) 13 connected to the ISDN PBX extension
FIG. 3 is a block diagram showing a case of connecting to 2. In the figure, the subscription number of the PBX 131 is #A and the extension number of the PBX is #a.
In ISDN PBX, a maximum of eight terminals are connected to extension number #a. Public network (CO) 101, terminal (TE
_b1 ) 104 and terminal (TE _b2 ) 105 are the same as those shown in FIG.

The terminal (TE _b2 ) 105 sends out a call setup message (i) to the public network (CO) 101 when making a call. That is, the destination address is the PBX subscription number #A, and the destination subaddress is the extension number #a in the PBX and the subaddress # of the terminal (TE _a1 ) 132 connected to the extension.
Is a combination of # and #, and the calling address and calling subaddress are the same as in the case of connection in the public network.
B, #. Public network that received the call setup message
(CO) 101 is the destination address #A as in the case of public network connection.
By recognizing that, the call setup message (ii) same as (i) is sent to the PBX 131.

The PBX 131 first analyzes the destination subaddress, extracts the extension number #a from this information, and outputs the destination address #a and the destination subaddress information destination subaddress information # a # received from the public network.
The call setup message (iii) containing the number # obtained by deleting the extension number #a from is sent to the extension a.

The terminal (TE _a1 ) 132 responds when the called subaddress matches its own number, and the terminal (TE _b2 ) 105 and terminal
Connection with (TE _a1 ) 132 is made.

FIG. 14 shows a terminal (TE _a1 ) 132 connected to the extension of the ISDN PBX to a terminal (TE _b2 ) 105 of the ISDN public network in the conventional connection method between the ISDN public network and the ISDN PBX.
It is a block diagram showing the case of connecting to the
Same as Figure 13. In this case, first, the terminal (TE _a1 ) 132 sets the call setup message (i) and sends it to the PBX 131. In this case, the call setup message (i) is, as shown in the figure, the extension number #a for the calling address and # for the calling sub address.
, The destination address is the access number α to the public network and the terminal
The combination of the subscriber number #B of (TE _b2 ) 105 and α # b, and the destination sub-address is the sub-address # of the terminal (TE _b2 ) 105.

Upon receiving the call setup message (i), the PBX analyzes the destination address and recognizes that the public network access number α is in it. Then, the call setting message (ii) is edited and sent to the public network. That is, the destination address in the call setup message (ii) is set to the subscriber number #B of the terminal (TE _b2 ) 105, which is the destination address α # B received from the extension minus the public network access number α, and the destination subaddress. Is set to the subaddress # of the terminal (TE _b2 ) 105 received from the extension, the subscriber number #A of the PBX is set to the calling address, and the calling subaddress # received from the extension is set to the PBX extension to the calling subaddress. Set # a # with number #a added. Thus, PB
From the terminal connected to the extension of X131, the terminal (TE _b2 ) 105 of the subscriber B connected to the public network (CO) 101 is called, and the terminal (TE _b2 ) 105 responds to the call. The connection between _a1 ) 132 and the terminal (TE _b2 ) 105 is established.

[Problems to be solved by the invention]

In the above-mentioned conventional connection method between the ISDN public network and the ISDN PBX, when the public network is connected to the extension of the PBX, the calling address information received by the extension of the called side (in the example of FIG. 14,
Since it is unclear whether #B) is from the public network or from within the PBX network, the receiving side cannot identify whether the calling source is an extension within the PBX network or a subscriber of the public network, which is inconvenient. There is a problem that is.

Also, the calling address received by the extension of the incoming call (in the example of Fig. 14,
#B) and the calling subaddress (# in the example of FIG. 14) are set to the called address and called subaddress to send back, and the call setup message is sent to the PBX.
Cannot call the calling terminal on the public network side because the callee terminal on the public network side cannot be called because the returned destination address (#B) does not include the public network access number. There is a problem that you call. That is, the conventional method has a problem that it is not possible to make a call back.

In view of the above problems, an object of the present invention is to use a PBX from a public network.
It is possible to identify whether the calling address information received by the extension of the receiving side is from the public network or from the PBX network when connecting to the extension of the receiving side, and the calling terminal of the public network side is called from the receiving terminal in the PBX. It is to be able to call back to the terminal.

[Means for Solving the Problems]

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

In the figure, I connected to the ISDN public network (CO) 101
SDN PBX131a is shown. According to the present invention, when an incoming call is made from the public network (CO) 101 to the terminal of the ISDN PBX 131a, the PBX 131a has the PBX 131a as the ISDN public network (CO).
The information (B) of the call origination address in the call setup message (ii) received from 101 is added with the public network access number α of the PBX 131a as the message (iii), and the receiving terminal (TE _a1 ) 132, terminal (TE) of the PBX 131a. _a2 ) It has a function to put it in the calling address of the call setup message sent to 133.

[Action]

When connecting from the ISDN public network (CO) 101 to the extension of the ISDN PBX 131a, since the extension number of the ISDN PBX 131a receives the access number α of the public network, the incoming call is from the public network. I understand.

Also, if the call origination address and the call subaddress received by the extension of the ISDN PBX 131a are put in the callee address and the callee subaddress and the call setup message is sent to the PBX 131a, the calling terminal of the original public network can be called and the call is sent back. It is possible.

〔Example〕

 The embodiment of the present invention will be described with reference to FIG. 1 again.

In the figure, ISDN PBX131a is an ISDN public network.
Information obtained by adding the public network access number α of the PBX 131a to the information #B of the calling address in the call setting message (ii) received from the (CO) 101 is used as the message (iii).
13 is the same as the conventional configuration of FIG. 13 except that the call setup message is sent to the called terminal (TE _a1 ) 132 or the terminal (TE _a2 ) 133. That is, the subscription number of the PBX 131a is #A, the extension number of the PBX is #a, and the ISDN PBX is
In 131a, a maximum of 8 terminals are connected to extension number #a. Public network (CO) 101, terminal (TE _b1 ) 104, terminal (TE _b2 ) 10
5 is the same as that shown in FIG.

The terminal (TE _b2 ) 105 sends out a call setup message (i) to the public network (CO) 101 when making a call. That is, the destination address is the PBX subscription number #A, and the destination subaddress is the extension number #a in the PBX and the subaddress # of the terminal (TE _a1 ) 132 connected to the extension.
Is a combination of # and #, and the calling address and calling subaddress are the same as in the case of connection in the public network.
B, #. Public network (C
The O) 101 recognizes the destination address #A, and sends the same call setup message (ii) as (i) to the PBX 131a, as in the case of the public network connection.

The PBX 131a first analyzes the destination subaddress, extracts the extension number #a from this information, #a as the destination address, and destination subaddress information # a # received from the public network as the destination subaddress.
Enter extension number #a from # and enter PB
The public network access number α of X is added to the calling address #B and sent to the extension a as a call setup message (iii).

The terminal (TE _a1 ) 132 responds when the called subaddress matches its own number, and the terminal (TE _b2 ) 105 and terminal
Connection with (TE _a1 ) 132 is made.

Terminal (TE _b2) are added PSTN access number α of PBX to the received originating address in the message (iii) to 105, by displaying the number α on a display or the like, the terminal (TE _b2) 105 It is extremely convenient for the user of the terminal because the calling terminal can be identified as being from the public network before the response from.

When calling back, the calling address α # B and calling subaddress # in the call setting message (iii) are
If you put it in the destination address and the destination subaddress and return, P
Without calling the extension number #B of the BX, the original calling terminal (T
E _b2 ) 105 can be called reliably.

FIG. 2 is a block diagram showing the configuration of the PBX 131a shown in FIG. In the figure, 21 is a network (NW),
22 is a line circuit (ILC) for ISDN terminal, 23 is a trunk for trunk line (ITK), 24 is a common control unit (CC), 25 is a main memory
(MM).

The common control unit (CC) 24 adds α to the calling address #B for the call setup message received from the trunk (ITK) 23 for the office line and performs other edit processing, and then sends this call setup message to the ISDN terminal line. Extension via circuit (ILC) 22
send to a.

FIG. 3 is a block diagram showing the details of the terminal (TE _a1 ) 132 and the ISDN terminal line circuit (ILC) 22. Terminal in the figure
In (TE _a1 ) 132, 301 is a handset (H), 302 is a communication circuit (SP), 303 is a codec (C / D), and 304 is a data terminal (DT).
E), 305 is a level converter (LV), 306 is a data rate converter (R)
A), 307 is a display unit (DSP), 308 is a switch (SW), 309 is a controller (CTL), 310 is a frame assembling / disassembling unit (FC), 311 is a driver (D), 312 is a receiver (R), 313 is a power supply (POW), 314
Is a hook switch (HS), 315 is a key, and 316 is a memory.

The display unit (DSP) 307 displays the calling address from the converter as it is. The originating address from the switch is also stored in memory 316 and its contents can be displayed later. The user sees the display, and the calling terminal P
It is possible to determine whether it is in the BX network or connected to the public network. Also, the calling address and the calling sub address displayed on the display unit (DSP) 307 can be returned to the calling source by calling the key 315 as the called address and the called sub address.

In the ISDN terminal line circuit (ILC) 22, 320 is a frame assembling / disassembling unit (FC), 321 is a driver (D), 322 is a receiver (R), and 323 is an interface unit (INF).

Between the ISDN terminal line circuit (ILC) 22 and the terminal (TE _a1 ) 132 is a so-called 2B + D channel digital subscriber line transmission line. Here, the B channel is an information channel and the D channel is a signal channel.

FIG. 4 is a diagram showing a call connection sequence between the public network and the PBX network according to the embodiment of the present invention. In FIG.
The only difference from the public network connection sequence in FIG. 11 is that the PBX is interposed between the receiving terminal and the exchange on the receiving side, and the call setting is performed after the processing of the calling address described above is performed in the PBX. It is almost the same as the public network connection sequence except that the message is sent to the receiving terminal.

FIG. 5 shows the PBX common control unit (CC) 24 shown in FIG.
3 is a flowchart illustrating the operation of the above. In FIG. 5, in step 51, the common control device (CC) 24 is the trunk for the office line.
(ITK) 23 to call setup information (call setup message (i
i)) Receive.

In step 52, the destination extension number (#a) is extracted from the contents of the destination subaddress (# a #) in the call setting information received from the trunk (ITK) 23 for the office line, and the destination ISDN terminal line circuit (ILC) is extracted. Call setup information (call setup message (i
ii) Enter in the destination address.

In step 53, the information (#) of the remaining called subaddress of the above processing is put into the called subaddress of the call setting information (call setting message (iii)) to be sent to the called ISDN terminal line circuit (ILC) 22.

In step 54, call originating information (#B) received from the trunk (ITK) 23 for the office line is provided with the office line access number α at the beginning, and the call setup information (ISC) for the ISDN terminal line circuit (ILC) 22 on the called side is sent ( Put it in the calling address of the call setup message (iii) (α # B).

In step 55, the contents of the calling subaddress (#) of the call setting information received from the trunk (ITK) 23 for the office line are set to the I side of the called side.
The call setting information (call setting message (iii)) to be sent to the SDN terminal line circuit (ILC) 22 is entered in the calling subaddress. In step 56, the standard editing processing of the call setting information to be sent to the ISDN terminal line circuit (ILC) 22 on the other receiving side is performed.

Then, in step 57, the call setting information (call setting message (iii)) is sent to the ISDN terminal line circuit (ILC) 22 on the called side.

Thus, the transmission of the call setting information is completed.

FIG. 6 is a diagram showing a state of processing on the main memory 25 of the PBX shown in FIG. In the figure, a call setup message from the trunk (ITK) 23 for the office line ((i in Fig. 1
i)) is converted in the PBX and becomes a call setup message ((iii) in FIG. 1) to become a line circuit for ISDN terminals.
It can be seen that it is sent to (ILC) 22.

FIG. 7 shows a memory 316 in the terminal (TE _a1 ) 132 shown in FIG.
It is explanatory drawing of the content of. As shown, the memory 316 includes two buffers 71 (BF1) and 72 (BF2), and n save memories (SA # 1 to SA # n) 73-1 to 73-n for the folding function. There is.

FIG. 8 is a flowchart explaining the display of the calling address information. In the figure, in step 81, the call setup message is received from the exchange, and the buffer (BF1) 71 in the memory 316 is received.
To store. Next, at step 82, the information of the source address and source subaddress in the buffer (BF1) 71 is displayed on the display unit (DSP) 3
Display on 07. From this display, it can be known whether the caller is from the public network or the PBX.

FIG. 9 is a flow chart for explaining the calling address, the calling sub address saving, and the calling back call for the call back function. In the figure, when the function key #i of the key 315 (Fig. 3) is pressed and communication is in progress in step 91, in step 92, the information of the calling address and the calling sub address in the buffer (BF1) 71 is saved in the save memory ( Save to sa # i) and finish the process.

If communication is not being performed in step 91, information of the source address and source subaddress in the save memory (sa # i) is copied to the destination address and destination subaddress of the buffer (BF2) 72 in step 93.

In step 94, information of the source address and source subaddress of the terminal (TE _a1 ) 132 is written in the source address and source subaddress of the buffer (BF2) 72.

In step 95, the buffer (BF2) 72 edits necessary information as a call setup message.

In step 96, the information in the buffer (BF2) 72 is sent to the public network (switch) as a call setup message.

In this way, the folding function can be realized.

〔The invention's effect〕

As is clear from the above description, according to the present invention, the IS
When connecting to the extension of the ISDN PBX from the DN public network, the access number α of the public network is added to the calling address received by the extension terminal of the ISDN PBX, so whether the incoming call is from the public network or the extension within the PBX. The serviceability is improved because it can be understood from

Also, since the calling address and the calling subaddress received by the extension of the ISDN PBX are put in the called address and the called subaddress and the call setup message is sent to the PBX, the calling terminal of the original public network can be called. IS
Even in the connection system between the DN public network and the ISDN PBX, it is possible to make a call back and the serviceability is improved from this point as well.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram showing the configuration of a PBX 131a in the embodiment of the present invention, and FIG. 3 is a terminal (TE _a1 ) 132 and I in the embodiment of the present invention.
FIG. 4 is a block diagram showing details of the line circuit (ILC) 22 for the SDN terminal, FIG. 4 is a diagram showing a call connection sequence between the public network and the PBX network according to the embodiment of the present invention, and FIG. 5 is shown in FIG. 6 is a flowchart for explaining the operation of the PBX common controller (CC) 24 according to the embodiment of the present invention, and FIG. 6 is a state of processing on the main memory 25 of the PBX according to the embodiment of the present invention shown in FIG. FIG. 7 shows a terminal (TE according to the embodiment of the present invention shown in FIG.
_a1 ) Explanatory drawing of contents of the memory 316 in 132, FIG. 8 is a flow chart for explaining display of calling address information according to the embodiment of the present invention, and FIG. 9 is a calling address for the loopback function according to the embodiment of the present invention. FIG. 10 is a flow chart for explaining saving of a calling subaddress and return call, FIG. 10 is a block diagram for explaining an ISDN public network connection system which is the background of the present invention, and FIG. 11 is a diagram showing a call connection sequence in the public network, FIG. 12 is a diagram showing the contents of a message in each step of the public network connection sequence, and FIG. 13 is a block diagram for explaining a case where a PBX arrives in the conventional connection method between an ISDN public network and an ISDN PBX, FIG. FIG. 3 is a block diagram illustrating a case where a PBX makes a call in a conventional connection method between an ISDN public network and an ISDN PBX. In the figure, 101 is a public network (CO), 104,105,132,133 ₁ terminal, 132 _a is PBX, 21 is a network (NW), the 22 IS
DN terminal line circuit (ILC), 23 is an office line trunk (ITK)
Reference numeral 24 is a common control device (CC), and 25 is a main memory.

Claims (1)

[Claims] 1. An IS connected via a trunk line trunk (23)
ISDN PBX that receives the call setup message from the DN network and sends it to the extension terminal connected via the ISDN line circuit (22).
In the above, when the ISDN PBX receives a call from the ISDN public network to an extension terminal of the ISDN PBX, the ISDN PBX extracts the landing extension number from the incoming subaddress in the call setting message received from the ISDN public network by the PBX to the extension terminal. In the incoming address of the call setup message, the remaining information of the incoming subaddress information is put in the incoming subaddress of the call setup message to the extension terminal, respectively, and the calling address of the PBX is set in the outgoing call address of the call setup message received from the ISDN public network. An originating address control method in an ISDN public network, which has a function of adding a public network access number to a call origination address of a call setting message to the extension terminal and sending the message to the extension terminal.