JP2010109739A - Ip key telephone set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an IP key telephone set which includes an IP outside line function coping with the number of IP outside lines ranging from a small scale to a large scale and a router function, can executes the functions at a high speed and can be achieved at a low cost. <P>SOLUTION: A CCU 1 includes a packet transfer circuit 10 as hardware, and has the IP outside line function and the router function necessary for the IP outside line function. A CEU 2 also includes a packet transfer circuit 20 as hardware, and has the IP outside line function and the router function necessary for the IP outside line function. The CCU 1 and the CEU 2 are connected in series and interlocked to achieve the IP outside line function and the router function of an IP key telephone set as a whole. A basic block of software for controlling the IP outside lines is operated on the CCU 1, and a block for performing NAT of SIP messages, voices and images is operated on the CEU 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an IP button telephone apparatus, and more particularly, to an IP button telephone apparatus having an IP external line function and a router function that can handle the number of IP external lines from a small scale to a large scale.

  The IP button telephone device has an IP outside line function and a router function. The router function includes a router function for connecting a PC (Personal Computer) connected to the IP button telephone device to the Internet via an ISP (Internet Service Provider), and the IP external line and IP extension of the IP button telephone device. There is a router function for voice / video packets between external lines / internal lines to enable voice / video calls to and from. The router function of the conventional IP button telephone device is realized by software transfer, and the IP outside line function is realized by a number of board configurations.

Patent Document 1 describes an Internet protocol-compatible private branch exchange capable of expanding the number of accommodated terminals. In this case, by introducing a built-in protocol handler in the MGC (Multimedia Gateway Controller), the number of ports of the control target terminal can be expanded from a small scale to a large scale.
Japanese Patent Laid-Open No. 2003-318954

  The IP button telephone equipment has IP-KT (Internet Protocol Key Telephone) with audio and video media capabilities, A-KT (Advanced Key Telephone) with video input / output and browser functions, and PC telephone key functions. Accommodates various IP extension telephones, such as an added soft phone (Software Key Telephone). Under such circumstances, the IP button telephone device has an IP external line function and a router function capable of accommodating from a small number of IP external lines of about 1 to 48 to a large number of IP external lines such as 49 to 192. It is desirable that these functions are executed at high speed.

  In an IP button telephone device having a router function by software transfer in the past, trying to realize an IP external line function that can accommodate a large number of IP external lines requires a large number of boards, resulting in high-cost hardware. Furthermore, there is a problem that the processing speed decreases.

  The Internet protocol-compatible private branch exchange of Patent Document 1 enables expansion of the number of accommodated terminals, and does not enable expansion of the number of IP external lines.

  The object of the present invention is to provide an IP external line function and a router function that can correspond to the number of IP external lines from a relatively small scale, or from a small scale to a large scale, and these functions are executed at high speed and at a lower cost. It is to provide an IP button telephone device that can.

  To achieve the above object, the present invention includes a packet transfer circuit including a packet transfer circuit as hardware, a main control board including a main control unit having an IP external line function and a router function necessary for the IP external line function, and a packet transfer circuit. Including hardware as an IP outside line router control board equipped with an IP outside line router control unit having an IP outside line function and a router function necessary for the IP outside line function, the main control board and the IP outside line router control board are in series A first feature is that the main IP control unit and the IP external line router control unit are connected and the entire IP external line function and router function are realized.

  In the present invention, a basic block of software for controlling the IP outside line operates on the main control unit, and a SIP message and a voice are included in the software for controlling the IP outside line on the IP outside line router control unit. A second feature is that a block that performs NAT (Network Address Translation) of an image operates.

  Furthermore, the present invention includes a main control board that includes a packet transfer circuit as hardware and includes a main control unit having an IP external line function and a router function necessary for the IP external line function. A third feature is that a basic block of software for controlling an outside line and a block for performing NAT (Network Address Translation) of SIP messages and voice / images operate.

  According to the first and second features of the present invention, an IP external line function and a router function that can accommodate from a small number of IP external lines to a large number of IP external lines are provided, and an IP that executes these functions at high speed. A button telephone device can be realized at low cost.

  Further, according to the third feature, it is possible to realize an IP button telephone apparatus that has an IP external line function and a router function capable of accommodating a relatively small number of IP external lines and that executes these functions at a low cost.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram conceptually showing an IP button telephone apparatus according to the present invention. The IP button telephone apparatus 100 of the present invention includes a main control unit (CCU: Central Control Unit) 1 and a customer edge unit (CEU: Customer Edge Unit) 2. CCU1 and CEU2 correspond to a main control unit and an IP external router control unit of the present invention, respectively. CCU1 and CEU2 are each composed of a single board, which are connected in series.

  The CCU 1 controls the basic operation of the entire IP button telephone device according to the main control software. Further, the CCU 1 has an IP external line function and a router function necessary for the IP external line function, and performs call processing control between the IP external line and the IP internal line and between them (including the IP internal lines). The CCU 1 includes the packet transfer circuit 10 as hardware, thereby realizing a router function. The main control software can interpret SIP, which is a protocol for IP external lines, so that IP external lines can be accommodated and IP external lines can be sent and received.

  CEU2 has an IP external line function and a router function necessary for the IP external line function, and functions as a high-speed broadband router that performs IP communication in which voice information and control information are multiplexed. CEU 2 also includes a packet transfer circuit 20 as hardware, thereby realizing a router function.

  The CCU 1 can accommodate a large number of IP extension telephones such as the IP key telephone 31 and other IP extension terminals 32. The PC can also be connected to CEU2.

  The CEU 2 is connected to a next generation network (NGN: Next Generation Network) 6 through an ONU (Optical Network Unit) 5. NGN6 is further connected to ISP7. The ONU 5 is a device installed in a subscriber's home in order to connect a terminal device such as a personal computer to the network in an optical fiber subscriber communication network. 0AB to J indicate telephone numbers in the IP telephone service of NGN6, and 050 indicates an IP telephone carrier (phone number starting with 050) serving the IP telephone. NGN6 is an IP network that integrates telephone services and video communication services using SIP, and includes IP telephone services with telephone numbers 0AB to J.

  Various types of boards that realize various functions can be mounted on the IP button telephone device. The present invention pays particular attention to the IP external line function and the router function. The CCU 1 is configured as a single board including the packet transfer circuit 10 having a hardware (custom LSI) configuration, and the CEU 2 is also a hardware. The packet transfer circuit 20 having the configuration is included to constitute a single board. Also, load distribution is achieved by distributing software blocks that control IP external lines to CCU1 and CEU2. When mounting, these two boards are connected in series, and CCU1 and CEU2 are linked to realize the IP external line function and router function of the IP button telephone device as a whole.

  When accommodating a small number of IP external lines of about 1 to 48 lines, all the software blocks that control IP external lines are mounted only on the CCU board and operated to operate the IP external line function and router. Functions can be realized.

  FIG. 2 is a block diagram conceptually showing the IP button telephone apparatus in this case. 2, the same or equivalent parts as in FIG. 1 are denoted by the same reference numerals. In this case, the CEU function is also incorporated in the CCU board.

  However, when accommodating a large number of IP external lines such as 49 to 192 lines, the processing load of the CPU becomes heavy with just the CCU board, and the processing speed becomes slow and processing becomes impossible. Service at the site is degraded. Therefore, in the present invention, the IP external line function and the router function of the IP button telephone apparatus are realized as a whole by distributing the load to CCU1 and CEU2 and connecting these boards in series.

  When linking CCU1 and CEU2, the basic block of the software that controls the IP external line is operated on CCU1, and among the software that controls the IP external line, SIP messages with heavy processing load and NAT (Network Address of voice / image) The block that performs the translation) should be run on CEU2.

  A CPU is arranged in each of CCU1 and CEU2, and the CPU is configured as a multi-CPU system that performs overall control by linking these CPUs, so load balancing can be realized. As a result, the speed of the IP outside line function can be increased.

  In outgoing / incoming calls to / from the IP external line, audio / video packets are transmitted / received through the route of the IP external network-CEU2-CCU1-IP extension. Since this transmission / reception is performed through the packet transfer circuits 10 and 20 having a hardware configuration installed in each of the CCU 1 and CEU 2, the router function can be speeded up. Furthermore, the processing load on the CPU itself in CCU1 and CEU2 is reduced.

  FIG. 3 is a functional block diagram showing an embodiment of the present invention. In FIG. 2, the same or equivalent parts as in FIG.

  The IP button telephone apparatus 100 according to the present embodiment has an external line such as an analog line, a number display contract line, a network number dial-in line, an analog leased line, a digital leased line, and an ISDN line. ) As well as VoIP lines and NGN (Next Generation Network) lines (IP external lines). In addition to extension terminals such as general analog terminals, digital button telephones, ISDN terminals, hotel phones, and fax machines (TDM extension telephones), IP extension telephones and other IP extension telephones are accommodated. Control calls to and from the phone.

  In the IP button telephone apparatus 100, the CCU 1 is mounted on a single board, and controls the basic operation (main control) of the entire IP button telephone apparatus according to the main control software. In addition, the CCU 1 performs call processing control between an IP external line, an IP extension, a TDM external line, and a TDM extension (including IP extensions and TDM extensions) to enable various calls. The main control software can interpret SIP, which is a protocol for IP external lines, so that IP external lines can be accommodated and IP external lines can be sent and received.

  CEU2 is also mounted on a single board and has a function as a high-speed broadband router that multiplexes voice information and control information to perform IP communication.

  A TDM system main control unit (TCCU: TDM Central Control Unit) 8 is also mounted on one board, and transmits / receives control information to / from CCU 1 to perform TDM system main control. This control includes, for example, control of various dedicated interfaces (TDM control units) for TDM external lines and internal lines.

  The voice conversion unit (VCU) 9 sends voice packets according to the media capability selected for the call and the media capability of the extension phone when it is transferred to an extension phone with a different media capability for voice. Convert from high sound quality to standard sound quality or vice versa. Also, a high-quality or standard-quality voice packet is sent to an extension telephone that holds a high-quality sound and a standard sound quality and does not have a hold sound at the time of holding according to the media capability during a call.

  TCCU8 includes legacy terminals (TDM extension telephones) such as fax terminal 61, hotel phone terminal 62, digital button telephone 63, and standalone telephone 64, and legacy external lines such as general external lines, ISDN net lines, digital private lines, and analog private lines (TDM external line) can be connected via various dedicated interfaces (TDM control unit) and a TDM bus 51 for TDM communication. The TDM bus 51 includes a D channel that transmits and receives control information and a B channel that transmits and receives audio information.

  CCU1 and TCCU8 are connected by two LAN cables, a LAN cable 54 for voice information transmission and a LAN cable 55 for control information transmission. CCU1, CEU2, and VCU9 are also connected with a LAN cable. Further, a maintenance computer 65 is connected to the CCU 1 via the LAN cable 16 and a switching hub (HUB) 53 is connected via the LAN cable 52. The HUB 53 is connected to a voice conference device as an IP key telephone 31 or an IP extension terminal 32 via a dedicated interface, and an IP cordless phone 33 is accommodated in a wireless access point (AP), and a software phone application is also provided. The mounted computer 40 is connected.

  CCU1 is CPU11, DDR memory (RAM) 12, flash memory 13, dedicated chip 10 specialized for packet transfer control, removable compact flash (CF) memory 14 and layer 2 switch (L2SW) 15 Is the main component. The dedicated chip 10 is a custom LSI that functions as the packet transfer circuit 10 of FIG.

  When CCU1 is powered on or reset (POWERON / RESET), the boot loader (software) in the flash memory 13 operates first, and the OS stored in the file system of the CF memory 14 is loaded into the DDR memory 12. to start. Next, the OS loads the CF memory 14 application (main control software) into the DDR memory 12 and starts it. As a result, the main control software operates.

  Further, the CF memory 14 has a database (DB) of system data (setting data) of the IP button telephone device, which is taken out as necessary and set as a variable on the DDR memory 12. Thereby, the IP button telephone apparatus operates according to the system data. The system data can be set by the maintenance computer 65.

  CEU2 includes a CPU 21, a DDR memory 22, a flash memory 23, a dedicated chip 20 specialized for packet transfer control, and an L2SW 24 as main components. The dedicated chip 20 is a custom LSI that functions as the packet transfer circuit 20 of FIG. 1 and is the same as the dedicated chip 10.

  TCCU8 is CPU81, DDR memory 82, flash memory 83, phi (PHY) 84, highway switch 85 that controls B channel of TDM bus 51, Dch control signal communication chip 86 that controls D channel, and DSP (Digital Signal Processor) 87 is the main component. The PHY 84 is an LSI that controls the physical layer of Ethernet (registered trademark) (not shown). The VCU 9 includes a CPU 91, a DDR memory 92, a flash memory 93, an L2SW 94, and a DSP 95 as main components. The DSP 95 converts voice packets from high sound quality to standard sound quality. The reverse conversion is also performed.

  The IP button telephone device 100 of the above embodiment is configured as a multi-CPU system in which CPUs 11, 21, 81, 91 are distributedly arranged in each of CCU1, CEU2, TCCU8 and VCU9, and these CPUs are linked to perform overall control. Therefore, load distribution can be realized. The TDM system dedicated interface (TDM control unit) also includes a CPU. In addition, since the packet transfer is controlled by the hardware configuration of the dedicated chips 10 and 20 mounted on the CCU1 and CEU2, the router function can be speeded up and the processing load on the CPU is reduced.

  In the IP button telephone device 100, for example, when the single phone 64 makes and receives calls via the TDM external line, the TCCU 8 performs control of call processing by transmitting and receiving control information via the CCU 1 and the LAN cable 55, and the TDM extension and the TDM external line. Allows voice information to be sent and received between them. The single telephone 64 and the TCCU 2 transmit / receive the PCM-converted voice information via the TDM bus 51 by time division multiplexing communication.

  Further, for example, when the single telephone 64 is made / received via an IP external line, a PCM converted voice signal is transmitted / received between the single telephone 64 and the TCCU 8 on the TDM bus 51 by time division multiplexing communication. Voice packets are exchanged between the TCCU 8 and the CCU 1 via the LAN cable 54. DSP87 of TCCU8 is used for the exchange of voice information TDM and packets. Control information between the TCCU 8 and the CCU 1 is transmitted / received via the LAN cable 55. In CEU2, it is connected to the IP external line via L2SW24, and CCU1 and CEU2 exchange voice packets by using their dedicated chips 10 and 20, respectively.

  In addition, for example, when the IP key telephone 31 makes / receives a call via a TDM external line, routes of the TDM bus 51, TCCU8, CCU1 and HUB53 are established. Furthermore, when the IP key telephone 31 makes / receives a call via an IP external line, the routes of CEU2, CCU1 and HUB53 are established.

  FIG. 4 is a diagram showing software blocks operating on CCU1 and CEU2. On CCU1, call control processing (CC: Call Controller) 101, IP external line accommodation block (IPTRK) 102, IP extension termination block (IPSLTC) 103, and voice / video packet NAT (Network Address Translation) block (RTP-NAT) 104 To work.

  The CC 101 is a software block that performs main control and call processing control of the IP button telephone device. IPTRK102 is a block for interpreting an IP external SIP message ([SIP / SDP] IPTRK specification), and IPSLTC103 is a block for interpreting an IP internal SIP message ([SIP / SDP] internal specification). The RTP-NAT 104 is a block that performs NAT of RTP (Real-time Transport Protocol) and RTCP (RTP Control Protocol), which are audio / video packets.

  On the other hand, on CEU2, a SIP gateway controller (SGC) 201 is operated. The SGC 201 is a block that performs WAN (WAN: Wide Area Network) -LAN conversion of SIP messages and audio / video packets among software blocks that control IP external lines. The SGC 201 includes an IP address NAT block (SIP-NAT) 202 and an audio / video packet NAT block (RTP-NAT) 203.

  The SIP-NAT 202 once terminates the SIP-UA (User Agent) from the IP outside line (WAN) side and re-establishes the SIP-UA on the LAN side. Or conversely, once terminate the SIP-UA from the LAN side, and re-install the SIP-UA on the WAN side. As a result, the IP address described in the SIP message and the IP address of the SIP packet are NATed and vice versa. For example, a SIP message of [SIP / SDP] ITSP (Internet Telephony Service Provider) is converted into a SIP message of [SIP / SDP] IPTRK specification or vice versa. The RTP-NAT 203 is a block that performs RTP and RTCP NAT which are audio / video packets. Here, NAT of voice / video packets is performed by being distributed to RTP-NAT 104 and RTP-NAT 203.

  As described above, the basic block of the software that controls the IP external line is operated on the CCU1, and among the software that controls the IP external line, the block that performs NAT of heavy processing load SIP message and voice / image address is CEU2. By operating on the above and distributing them to the CPUs of CCU1 and CEU2, it is possible to realize high speed IP external line functions and router functions that can accommodate a large number of IP external lines as a whole.

  FIG. 5 is a diagram showing software blocks that operate on the CCU 1 when accommodating a small number of IP external lines of about 1 to 48 lines (FIG. 2). In FIG. 5, the same or equivalent parts as in FIG. In this case, since the CEU function is also incorporated into the CCU board, all the software blocks in FIG. 4 are operated on the CCU. For this reason, although the number of IP external lines accommodated is limited, it is possible to realize an IP button telephone apparatus that executes the IP external line function and the router function at high speed at low cost.

It is a block diagram which shows notionally the IP button telephone apparatus of this invention. FIG. 2 is a block diagram conceptually showing an IP button telephone apparatus when accommodating a small number of IP external lines. It is a functional block diagram which shows one Embodiment of this invention. It is a figure which shows the software block which operate | moves on CCU and CEU of FIG. It is a figure which shows the software block which operate | moves on CCU of FIG.

Explanation of symbols

1 ... Main control unit (CCU), 2 ... Customer edge unit (CEU), 5 ... ONU (Optical Network Unit), 6 ... Next generation network (NGN), 7.・ ・ ISP (Internet Service Provider), 8 ... TDM system main control unit (TCCU), 9 ... Voice conversion unit (VCU), 10,20 ... Dedicated chip (transfer circuit), 11,21, 81,91 ... CPU, 12,22,82,92 ... DDR memory (RAM), 13,23,83,93 ... Flash memory, 14 ... Compact Flash (registered trademark) (CF) Memory, 15, 24, 94 ... Layer 2 switch (L2SW), 16, 52, 54, 55 ... LAN cable, 31 ... IP button telephone, 32 ... IP extension terminal (voice conferencing equipment) 33 ... IP cordless phone, 40 ... computer, 51 ... TDM bus, 53 ... switching hub (HUB), 61 ... fax terminal, 62 ... hotel phone terminal, 63 ...・ Digital button phone, 64 ・ ・ ・ Single unit Speaker, 65 ... Maintenance computer, 84 ... Phi (PHY), 85 ... Highway switch, 86 ... Dch control signal communication chip, 87,95 ... DSP, 100 ... IP button Telephone equipment

Claims (3)

A main control board including a packet transfer circuit as hardware, and having a main control unit having an IP external line function and a router function necessary for the IP external line function;
An IP external router control board that includes a packet transfer circuit as hardware and is equipped with an IP external router function unit having an IP external function and a router function necessary for the IP external function,
The main control board and the IP external router control board are connected in series, and the main control unit and the IP external router control unit are interlocked to realize the entire IP external function and router function. IP button telephone device. On the main control unit, a basic block of software for controlling the IP outside line operates. On the IP outside line router control unit, among the software for controlling the IP outside line, a SIP message and a voice / image NAT (Network 2. The IP button telephone apparatus according to claim 1, wherein a block that performs Address Translation operates. A main control board including a packet transfer circuit as hardware, and having a main control unit having an IP external line function and a router function necessary for the IP external line function,
An IP button telephone apparatus characterized in that a basic block of software for controlling an IP outside line and a block for performing NAT (Network Address Translation) of a SIP message and voice / image operate on the main control unit.

Images