JP2001237850A - Pbx-atm signaling conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signaling conversion system that makes conversion between ATM call connection information and PBX call connection information. SOLUTION: In a network where a caller private branch of exchange (PBX) and a called party PBX are connected via an ATM network, a CLAD is provided with a means that receives and analyzes call connection information from a caller PBX, with a means that converts the information after being analyzed into a correspond ATM network, with a means that receives and analyzes the call connection information from the ATM network, and with a means that converts the ATM address into a corresponding PBX selection signal after the analysis. Thus, the SVC connection in the ATM network is attained, the band usage efficiency in the ATM network is enhanced and the communication cost is reduced and also the information can be transmitted without deteriorating its voice quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a P
The present invention relates to a PBX-ATM signaling conversion method for performing a voice call between BXs.

[0002]

2. Description of the Related Art Conventionally, when a voice call is made between PBXs via an ATM network, an ATM forum af-vtoa-
As standardized by 0078 (circuit emulation service), communication on the ATM network is transmitted by a PVC connection, and the voice band (band for PBX) in the ATM network is always occupied regardless of whether it is used or not. Thus, the statistical multiplexing effect, which is an advantage of the ATM system, could not be obtained. Also, the relay exchange was performed by the PBX side because of the PVC connection. In the case of this PVC connection method, in addition to an increase in the number of channels between the CLAD and the relay PBX, there is a demerit that voice quality is degraded because celling / decelling is repeated.

[0003]

In the above prior art, C
Since the LAD does not have the function of receiving the call connection information from the calling side PBX, analyzing it, and converting it to the corresponding ATM address, the SVC connection in which a call path is established every time there is a call connection request cannot be made. Voice communication via the ATM network was performed by PVC connection.

[0004] An object of the present invention is to solve the above-mentioned problems and to provide an AT
An object of the present invention is to enable voice communication by SVC connection on an M network.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a network for connecting a private branch exchange (PBX) on the calling side and a PBX on the called side via an ATM network. Means for receiving and analyzing call connection information from the side PBX, means for analyzing and converting it to a corresponding ATM address, means for receiving and analyzing call connection information from the ATM network, Is provided to the CLAD by means for converting the signal into a selection signal of the corresponding PBX.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a network configuration according to an embodiment of the present invention.

In FIG. 1, reference numerals 104, 105 and 106 denote CLADs embodying the present invention.

[0009] The PBX 101 in FIG.
2. FAX 103 is connected, Tx between PBX and CLAD
They are connected by TC2M interfaces 109 and 110 and an OD interface 111. The connection to the ATM network 100 directly from the CLAD 106 or the ATM switch 10
ATM with built-in CLAD function
It is connected from the switch 108.

FIG. 2 shows call connection information and PB of an ATM according to the present invention.
It is a PBX-ATM interworking conceptual diagram which converts the call connection information of X.

The CLAD 201 in the site A and the CLAD 211 in the site B are connected by a trunk line 200 constructed by an ATM dedicated line or a high-speed digital dedicated line. And at site A, PBX 202 is C
The LAD 201 and the TTC2M interface 203 are connected by an individual line signal system, and the telephone 204 and the FAX 205
Is housed. On the other hand, at site B, PBX2
Reference numeral 12 is connected to the CLAD 211 via the OD interface 213, and accommodates a telephone 214 and a FAX 215.

In the PBX-ATM network system realized by the present invention, a call connection path (logical path) for transferring call connection information is fixedly secured between the CLADs 201 and 211 by PVC connection. Only one call connection path is set. On the other hand, a call path (logical path) for transferring voice information is provided after call setting information is exchanged through a call connection path for each call from the PBX.
Established by SVC connection.

The number of calls (number of communication paths) established between both sites is set in advance in both CLADs as configuration information.

For example, when there is a call connection request from the site A telephone set 204 to the site B telephone set 214, the calling PBX 202 transfers the call connection information to the CLAD 201. Upon receiving this information, CLAD 201 analyzes
It is converted to TM call connection information and transferred to the trunk line. CLA of site B which received ATM call connection information from the trunk line
D211 analyzes and converts it into PBX call connection information,
Transfer to X212. PBX212 that received this information
Calls the corresponding telephone 214 after the analysis, and a telephone call is established between the telephones 204 and 214.

FIG. 3 shows that the interface with the PBX is TT.
FIG. 10 is a sequence diagram of call connection information in a case where connection is performed in a C2M interface in which a signaling method is an individual line and a start signal is a DP signal; With reference to this figure, a description will be given of a process from calling to establishment of a call.

When the calling PBX 302 receives a calling signal from the telephone 303, it returns a dial tone. The caller of the telephone 303 receiving the dial tone dials the telephone number of the telephone 313 on the called side. PB that received this dial
X302 determines that there is a call connection request to the called telephone 313, and the calling PBX 302 sets the activation signal SS to O.
N, and transfers the selection signal DP signal to the calling side CLAD 301. The CLAD has a function of detecting the DP signal, and can recognize the telephone number of the incoming call by checking the change of “0” or “1” of the signal bit A of the time slot 0 of the TTC2M interface. After receiving the selection information, the CLAD 301 analyzes the ATM address (AF in the E.164 format) with reference to the number conversion table.
The telephone number is set left-justified in the IDI area after the I area, the empty area is padded with “0”, and “F” is set in the last digit. The AFI area is fixed at “45”), and the ITU-T Q. The call is mapped to the SET-UP message format of 2931 / ATM Forum UNI 4.0, and the call is transmitted to the ATM network (relay line) 300. The ATM network 300 sends an S to the called CLAD 311.
ET-UP message is transferred and the calling CL
Returns CALL PROC to AD301. ATM network 30
CL of the called side that has received the SET-UP message from 0
The AD 311 analyzes the ATM address (E.164 format) in the SET-UP message, and sends the C address to the ATM network 300.
Returns ALL PROC, converts received ATM address to PBX selection signal (PB signal or DP signal), turns on incoming signal SR, and transfers selection signal (PB signal or DP signal) to called side PBX 312 I do. The PBX 312 that has received this selection information transmits a calling signal to the corresponding telephone set 314 after analysis. When the receiver who hears the ringing tone picks up the handset, a response signal is generated by the PBX 312.
Return to Upon receiving the response signal, the PBX 312 starts the activation signal S
Turn S on. CLA that received ON of start signal SS
D311 transmits CONN to the ATM network 300. CO
The ATM network 300 receiving the NN sets the CONN to the CLAD3.
01 and CONN ACK to CLAD3
Return to 11. Upon receiving the CONN, the CLAD 301 turns on the incoming signal SR and returns a CONN ACK to the ATM network. PBX that received ON of SR from CLAD301
When 302 turns on SR, a telephone call is established between telephones 304 and 314.

[0017]

As described above, according to the present invention, means for receiving and analyzing call connection information from a calling PBX, means for analyzing and converting the information to a corresponding ATM address, The CLAD is provided with means for receiving and analyzing call connection information of the CLAD and means for converting the ATM address into a corresponding PBX selection signal after the analysis.
The SVC connection in the TM network becomes possible, and the band use efficiency in the ATM network is improved, and the communication cost can be reduced. Also, there is an effect that transmission can be performed without deteriorating voice quality.

[Brief description of the drawings]

FIG. 1 is a network configuration diagram of an embodiment when implementing the present invention.

FIG. 2 is a conceptual diagram of PBX-ATM interworking for converting ATM call connection information and PBX call connection information.

FIG. 3 is a sequence diagram showing a procedure for transferring call connection information (individual line signaling).

[Explanation of symbols]

200: trunk line (ATM, high-speed digital line), 2
01 · 211 ··· CLAD (cell assembly / cell disassembly device), 202 · 212 ··· PBX (private branch exchange), 203
... TTC 2M interface (JJ20.10-1
2), 204, 214 ... Telephone (TEL), 205.2
15: Facsimile (FAX), 213: OD interface.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshimichi Nome, 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the IP Systems Division of Hitachi, Ltd. (72) Inventor Tadashi Tamaki 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa F-term in the IP Systems Division of Hitachi, Ltd. (Reference) 5K030 HA10 HB11 HB18 JA06 JA13 KA13 LB02 5K049 BB04 5K051 AA05 DD03 GG02 JJ02

Claims (6)

[Claims] The present invention relates to a network for connecting a private branch exchange (PBX) on a calling side and a PBX on a called side via an ATM network.
In the disassembly device (CLAD), a function of receiving call connection information from the calling side PBX, a function of converting the received PBX call connection information into an asynchronous transfer mode (ATM) call connection information, and a function of receiving data from the ATM network. A PBX-AT having a function of receiving call connection information and a function of converting the received ATM call connection information into PBX call connection information.
M signaling conversion scheme. 2. The CLAD comprises: means for interpreting a selection signal (PB signal / DP signal) from a calling PBX;
2. The PBX-ATM signaling conversion system according to claim 1, further comprising means for interpreting a SET-UP signal from the M network. 3. The CLAD receives a PBX selection signal (P
2. The PBX-ATM signaling conversion system according to claim 1, further comprising a number conversion table for converting between the B signal / DP signal) and the ATM address in the ATM SET-UP signal. 4. The PBX-ATM signaling conversion system according to claim 1, wherein said number conversion table can be set and changed by configuration information. 5. The PBX according to claim 1, wherein the interface of the calling / calling side PBX is a TTC 2M interface, and the call connection system is a dedicated line signaling system.
-ATM signaling conversion scheme. 6. The PBX-ATM according to claim 1, wherein the interface of the calling / calling side PBX is an OD interface, and the call connection system is an individual line signaling system.
Signaling conversion method.