CN1260657A - Local area network digital telephone exchange system - Google Patents
Local area network digital telephone exchange system Download PDFInfo
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- CN1260657A CN1260657A CN 99100139 CN99100139A CN1260657A CN 1260657 A CN1260657 A CN 1260657A CN 99100139 CN99100139 CN 99100139 CN 99100139 A CN99100139 A CN 99100139A CN 1260657 A CN1260657 A CN 1260657A
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Abstract
The local area network digital telephone switching system comprises electronic computer, server formed by connected network card and telephone speech card (telephone switching sysetm), digital telephone extension and connection server and network data wire of all digital telephone extensions (transmismission line). The server is connected with public telephone network. Said server sets a network address for every extension, and establishes network address data base for correspondent relationship between the extension number and network address. Said system uses server as network bridge, and establishes computer digital network network between public telephone network and all digital extensions, so that it can utilize computer digital network technology to identify and transmit dual-tone multifrequency signal to establish connected relation of calling party and called party, and utilizes D/A and A/D conversion to implement two-way speech transmission between calling party and called party.
Description
The present invention relates to a kind of electrical communication technology, relating to a kind of or rather is the computer network system of feature with the telephone exchange function.
Traditional telephone switching system is mainly connected to form by telephone exchange, telephone set and transmission line, and telephone exchange makes between arbitrary telephone subscriber and desired another telephone subscriber and sets up annexation and intercourse information.Exchange, converse with analog voice signal.Private branch exchange connects each extension telephone user and is connected with public switched telephone network (PSTN) by trunk line.
Existing local area network (LAN), inside intelligent network as enterprise, building etc., by digital circuit (being generally optical cable or cable) and be connected the computer data network that the some terminals (computer) on this digital circuit are formed, each network terminal is by the digital circuit transmitting digital signals.Carry out information interchange and resource-sharing.
Along with the develop rapidly and the people of the computer technology and the communication technology instruct the serious hope of production, scientific research, commercial affairs, management etc. to utilizing state-of-the-art technology, built the intelligent wiring system in more and more enterprises, cause, the building, promptly be laid with two covers are independent mutually, Each performs its own functions switched telephone network and internal computer data network simultaneously, telephone wire and optical cable or cable are also deposited, make inner information network complicated, also increased the construction cost of network and maintenance, operation, management cost.
The objective of the invention is to design a kind of local area network digital telephone exchange system, by the telephone exchange technology is applied in the computer network, two combine into one with switched telephone network and internal computer data network in other words, and form a kind of novel local area network digital telephone exchange system that possesses the telephone exchange function with an internal computer data network simultaneously.
The object of the present invention is achieved like this: a kind of local area network digital telephone exchange system, comprise telephone exchange, subsets and transmission line, and it is characterized in that: described subsets are digital telephone extension sets; Described transmission line is the computer network data line; Described telephone exchange is the server that is connected and composed by electronic computer, network interface card and telephone sound card, telephone sound card and network interface card are connected with the bus of electronic computer respectively, described network interface card also is connected with the computer network data line, described telephone sound card also is connected with public telephone network, and described digital telephone extension set is connected on the computer network data line.
Described computer network data line comprises computer special use or the general digital grid line that contains NT net, NOVEL net.
Described server has more than two or two, and the server more than two or two connects public telephone network respectively, and the server more than two or two is connected to each other by the Digital Media that comprises Internet, satellite optical fiber.
Described digital telephone extension set is the multimedia computer that includes special-purpose software, is made up of CPU and the network interface card that is connected with CPU, sound card and sending of being connected with sound card, receiver, and described network interface card connects described network data line.
Described digital telephone extension set is the computer that adds special digital phonecard and software, the special digital phonecard be plugged in the expansion slot of computer and connect give, receiver, also include network interface card, connect computer and described network data line.
Described digital telephone extension set is made up of an ordinary telephone set and a jockey, and this jockey includes central processing unit, read-only memory, random access memory, A/D converter, D/A, input/output interface controller, network interface and speech/double-audio signal processor; Described read-only memory, random access memory and input/output interface controller are connected with central processing unit respectively, described network interface is connected with the input/output interface controller and is connected with described network data line, described input/output interface connects A/D converter, D/A and speech/double-audio signal processor respectively, and described speech/double-audio signal processor connects ordinary telephone set.
Described digital telephone extension set is the special digital telephone set, comprise central processing unit, read-only memory, random access memory, input/output interface controller, keyboard, A/D converter, D/A and network interface, described read-only memory, random access memory and input/output interface controller connect central processing unit respectively, described keyboard, A/D converter, D/A and network interface connect the input/output interface controller respectively, and described network interface is connected with described network data line.
Local area network digital telephone exchange system of the present invention, include outside to inner call model, inner to outside call model and inner to inner call model, it is characterized in that:, and set up network address database with corresponding relation between extension telephone number and its network address for each digital telephone extension set is provided with a network address; With the server that connects to form by electronic computer, telephone sound card and network interface card as bridge, make between public switched telephone network (PSTN) and each digital extension set and set up the computer numeral network, utilize the identification of computer numeral network technology, forwarding dual-tone multifrequency/pulse signal to set up calling and called telephone subscriber's annexation and carry out the calling and called two-way voice transmissions by digital-to-analogue, analog-to-digital conversion.
Described outside further comprises to inner call model: described server is receiving that public telephone network provides the dialogue environment when calling out, obtain purpose numeral extension telephone data earlier, find purpose numeral extension telephone network address by the referral web site database again, and call intent numeral extension telephone, set up with public telephone network between be connected.
Described inside further comprises to outside call model: described server is when receiving the internal digital extension telephone to the call signal of external call, by server the digital call signal is outwards carried out the forwarding of touch-tone signal, set up with public telephone network between be connected.
Described inside further comprises to inner call model: when server receives that a certain digital extension telephone A calls out the digital call signal of another digital extension telephone B, the referral web site database finds the network address of purpose numeral extension telephone B, and by this network address purpose numeral extension telephone B is called out, set up being connected between digital extension telephone A and digital extension telephone B.
Described network address database is based upon in other network equipment of the inside of described server or server outside.
The present invention connects each the digital extension telephone (terminal) in the LAN (Local Area Network) by server (private branch exchange), each local area network (LAN) connects by server, thereby form the local area network (LAN) of extension, this local area network (LAN) also possesses the function that is better than telephone switching system except the function with computer network.Server distributes a network address for each digital extension telephone, realizes connection between each digital extension telephone by the Network Search address.The numeral extension telephone will include the packet of dialing information and deliver to server, and server unpacks the back and takes out dialing information, by two audio-frequency generators dialing signal is delivered to public telephone again and puts through phone on the net, finishes the process of being called to outside line by interior lines.When server is received dual-tone dialing signal from public telephone network, the data of talking with environment and obtaining the purpose extension set is provided by server, from database, retrieve the network address of digital telephone extension set, thus the process that realization is called to interior lines by outside line.
Local area network digital telephone exchange system of the present invention and traditional telephone switching system relatively have following characteristics: the extension set number of a. black phone switching system is because of being subjected to its capacity limit, therefore fix, and local area network digital telephone exchange system of the present invention, because of the internal communication resource huge, in theory, manageable extension set number is unrestricted; B. the trunk line of black phone switching system is fixed, and local area network digital telephone exchange system of the present invention has sufficient extending space, and its cost is well below legacy phone switch; C. the black phone switching system needs to begin backguy from switch when dilatation, and local area network digital telephone exchange system of the present invention then can be from any network node lead-in wire; D. the black phone switching system carries out communication with time-division, empty branch technology, the bandwidth of ordinary telephone line only is 64K, and local area network digital telephone exchange system of the present invention is to utilize the high-speed wideband data communication ability of computer network to carry out communication, bandwidth can reach 100M, convert digital signal to and after overcompression in audio signal, the bandwidth of single channel conversation is much smaller than 64K, so the single channel conversation only need be no more than the data flow of 10Kbit/s; E. legacy phone switch uses analog voice signal to exchange, and local area network digital telephone exchange system of the present invention is that analog signal conversion is become digital signal with after public telephone network is connected, and transmits in local area network digital telephone exchange system then; F. local area network digital telephone exchange system of the present invention has more powerful expanded function than black phone switching system, can realize the function that legacy phone switch need use higher cost to realize with lower cost, when realizing video telephone and video conference as the analog form of using legacy phone switch, image quality is low, realization cost height, and when realizing video telephone and video conference with the computer numeral network communication ability of local area network digital telephone exchange system, required cost reduces greatly, and image quality is good, in addition, the setting of voice mail also greatly facilitates inner telephone-moving, more meets the requirement of the office of flowing; G. local area network digital telephone exchange system of the present invention can be finished functions such as charging, statistics, management in very simple and direct mode, and can be dissolved in more easily in the modern computer management mode.
The present invention is applied to switched telephone network with computer networking technology, both are united two into one, thereby form a kind of digital telephone exchange system that adopts computer networking technology, can reduce the equipment cost of switched telephone network and maintenance, operating cost greatly, and provide function widely, also simplified the inside intelligent information network configuration in enterprise, cause, building etc. simultaneously greatly, set up basis in advance for phone enters information superhighway.
Further specify technology of the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 1 is the local area network digital telephone exchange system structural representation
Fig. 2 is first kind of example structure schematic diagram of digital telephone extension set among Fig. 1
Fig. 3 is second kind of example structure schematic diagram of digital telephone extension set among Fig. 1
Fig. 4 is the third example structure schematic diagram of digital telephone extension set among Fig. 1
Fig. 5 is the 4th a kind of example structure schematic diagram of digital telephone extension set among Fig. 1
Fig. 6 is that local area network digital telephone exchange system main control module S1 structure and flow process concern schematic diagram
Fig. 7 is an automatic off-hook module S2 workflow diagram among Fig. 6
Fig. 8 is that called extension set data obtains module S3 workflow diagram among Fig. 6
Fig. 9 is called extension set name and a purpose Web site query module S4 workflow diagram among Fig. 6
Figure 10 is a called call extension module S5 workflow diagram among Fig. 6
Figure 11 is a called extension set state feedback module S6 workflow diagram among Fig. 6
Figure 12 is an outside line resource query module S7 workflow diagram among Fig. 6
Figure 13 is an outside line dial module S8 workflow diagram among Fig. 6
Figure 14 is an inside/outside line connectivity module S9 workflow diagram among Fig. 6
Figure 15 is an interior lines dialing receiver module S10 workflow diagram among Fig. 6
Figure 16 is interior/interior lines connectivity module S11 workflow diagram among Fig. 6
Figure 17 is an on-hook module S12 workflow diagram among Fig. 6
Figure 18 is the network address database structural representation of local area network digital telephone exchange system of the present invention
Referring to Fig. 1, local area network digital telephone exchange system of the present invention is connected to form by server 11, grid line 12 and a plurality of digital telephone extension set 13, and is connected with public telephone network 14.Server 11 comprises electronic computer 111, bus 112 and the telephone sound card 113 that is connected with bus 112 (as the employed sound card in 168 information service centers) and network interface card 114.Electronic computer 111 is connected and composed by cpu central processing unit U1, random access memory U2, read-only memory U3 and bus control unit U4.Network interface card 114 is used to connect computer network, connects each digital telephone extension set 13 (extension set A, extension set B by grid line 12 ...).113 of telephone sound cards be used to provide language environment and with being connected of public telephone network 14.Telephone sound card 113 includes A/D analog to digital converter U5, D/A digital to analog converter U6, public telephone state identifier U7, dual tone multi-frequency dtmf/pulse signal identifier U8 and dual tone multi-frequency dtmf/pulse signal generator U9.Server 11 is when implementing, and its hardware components only needs in common computer plant telephone sound card and network interface card to realize.
Referring to Fig. 2, be first kind of enforcement structure of digital telephone extension set 13 in the system of the present invention, be a kind of multimedia computer that comprises special-purpose software, by computer 21, network interface 22, sound card 23 and give, receiver 24 (receiver and microphone) forms, network interface 22 connects grid lines 12.
Referring to Fig. 3, be second kind of enforcement structure of digital telephone extension set 13 in the system of the present invention, it is a kind of computer that installs special digital phonecard and software additional, form by computer 31 (can utilize existing computer), network interface 32, digital telephone card 33 and electrophone 34 (receiver and microphone), network interface 32 connects grid line 12, digital telephone card 33 comes down to a digital-to-analogue (A/D, D/A) transducer, is plugged in the expansion slot of computer 31, and computer 31 can be used for control, packed data.
Referring to Fig. 4, it is the third enforcement structure of digital telephone extension set 13 in the system of the present invention, be a kind of structure that installs special equipment 42 on existing ordinary telephone set 41 additional, special equipment 42 is connected to form by cpu central processing unit 421, read-only memory 422, random access memory 423 (single-chip microcomputer), I/O (I/O) interface controller 424, digital-to-analogue (A/D, D/A) transducer 425, speech, dual-tone multifrequency, pulse signal processor 426, power supply 427 and network interface 428.Network interface 428 connects grid line 12, and signal processor 426 connects ordinary telephone set 41, and power supply 427 provides direct current supply for special equipment 42.
Referring to Fig. 5, be the 4th kind of enforcement structure of digital telephone extension set 13 in the system of the present invention, be a kind of independently, special-purpose digital telephone extension set, connect to form by cpu central processing unit 51, read-only memory 52, random access memory 53 (single-chip microcomputer), I/O (I/O) interface controller 54, digital-to-analogue (A/D, D/A) transducer 55, keyboard 56, network interface 57 and electrophone (receiver and microphone) 58.Network interface 57 connects grid line 12.
The digital telephone extension set receives net call sign by server, detects the extension set state by CPU, then sends busy signal to network if do, if the spare time is then sent bell signal, send waiting signal to network simultaneously; Send off hook signal to network behind the digital telephone extension set off-hook; After the digital telephone extension set receives the communications signals of network, the digital signal of network is converted to voice signal and converts the voice signal of digital telephone extension set to digital signal, realize conversation by digital-to-analogue (A/D, D/A) transducer; The digital telephone extension set send on-hook signal by CPU to network after on-hook or receiving the network on-hook signal, finish conversation.
Referring to Fig. 6, the main control module of local area network digital telephone exchange system shown in figure S1 structure and flow process relation, main control module S1 is used to manage other module, finishes the digital signal exchange between the inside/outside line.Other module comprises automatic off-hook module S2 (seeing Fig. 7 for details), called extension set data obtains module S3 (seeing Fig. 8 for details), called extension set name and purpose Web site query module S4 (seeing Fig. 9 for details), called call extension module S5 (seeing Figure 10 for details), called extension set state feedback module S6 (seeing Figure 11 for details), outside line resource query module S7 (seeing Figure 12 for details), outward dialing module S8 (seeing Figure 13 for details), inside/outside line connectivity module S9 (seeing Figure 14 for details), interior lines dialing receiver module S10 (seeing Figure 15 for details), in/interior lines connectivity module S11 (seeing Figure 16 for details) and on-hook module S12 (seeing Figure 17 for details).
Automatic off-hook module S2 is when outside line has call signal to enter server, and control public telephone state identifier U7 off-hook also keeps.Called extension set data obtains module S3 after server is received the extension number (as DTMF or pulse signal) that outside line dials in, and control DTMF/ pulse signal identifier U8 receives and identifies this signal.Called extension set name and purpose Web site query module S4 are after server is received the extension number that outside line dials in, (database structure as shown in figure 18 for inquiry extension set name and purpose network address database, for setting up unique corresponding relation between extension number and network address), obtain the purpose network address.Called call extension module S5 gives corresponding extension set with call signal after receiving the purpose network address.Called extension set state feedback module S6 is used to detect called extension set state, and analyzes this state, so that make corresponding processing.Outside line resource query module S7 is used to inquire about the busy-idle condition of outside line.It is the dtmf signal of outside line that outward dialing module S8 is used to transmit the outside line signal that extension set sends out.Inside/outside line connectivity module S9 sets up passage for the conversation of inside/outside line.Interior lines dialing receiver module S10 is used to obtain the interior lines dialing signal.Interior/interior lines connectivity module S11 is that passage is set up in the mutual conversation between the extension set of interior lines.On-hook module S12 is used to discharge resource and fill in record after finishing conversation.
Further specify accompanying drawing 6 to accompanying drawing 18 below in conjunction with three kinds of mode of operations of system of the present invention and with reference to accompanying drawing 1.X1 represents the outside line bell signal among the figure, X2 represents the called phone double-audio signal, X3 represents the called phone digital signal, X4 represents called extension set network address signal, X5 represents audio digital signals, and X6 represents analog voice signal, and X7 represents called call extension signal, X8 represents completely restricted extension state feedback signal, X9 represents the completely restricted extension off hook signal, and X10 represents the completely restricted extension on-hook signal, and X11 represents the outside line on-hook signal, X12 represents outside line resource status signal, X13 represents that home extension intercom allows signal, and X14 represents outside line resource feedback signal, and X15 represents the outside line bell signal, X16 represents the External Call signal, and X17 represents off hook signal.
The outside may further comprise the steps to inner call model:
A. when the public telephone state identifier U7 on the server telephone sound card when outside line receives outside bell signal, electronic computer to server sends the External Call signal, after electronic computer is received this signal, under S1 master control module controls shown in Figure 6, start electronic computer and start working;
B. send the software off hook signal by Fig. 6, S2 automatic off-hook module shown in Figure 7 to public telephone state identifier U7, electronic computer enters Fig. 6 subsequently, the called extension set data of S3 shown in Figure 8 obtains module, by the digital to analog converter U6 on the server telephone sound card prompting audio digital signals of direct inward dialing to extension autom is converted to analog voice signal and is sent to public telephone network;
C. will convert called extension set digital signal to from the called extension set dual-tone multifrequency/pulse signal of public telephone network by the dual-tone multifrequency on the server telephone sound card/pulse signal identifier U8, after the S3 module receives this called extension set digital signal, it is passed to Fig. 6, called extension set name of S4 and purpose Web site query module shown in Figure 9;
The d.S4 module is by inquiry network address database shown in Figure 180, called extension set digital signal is translated into called extension set network address signal and is transferred to Fig. 6, called call extension module S5 shown in Figure 10, the S5 module is sent called call extension signal by the network interface card U10 and the network data line 12 of server to called extension set;
E. receive the completely restricted extension state feedback signal of called extension set by Fig. 6, called extension set state feedback module S6 shown in Figure 11, be busy tone or waiting signal, the S6 module is fed back the extension set state and is waited for the extension set off-hook to public telephone network according to the signal condition that receives and by analog to digital converter U6, finishes callwork;
F. after carrying machine, extension set then enters outside with inner talking state, server is under the control of main control module S1, start Fig. 6, the inside/outside wire module S9 work of Figure 14, to be converted to audio digital signals from the analog voice signal of public telephone network by A/D converter U5, by electronic computer this audio digital signals is passed to the called number digit extension by network interface card U10 and network data line 12 again, finish voice transfer from outside to inside, and the audio digital signals that the called number digit extension sends is transferred to the S9 module by network interface card U10 and network data line 12, the S9 module converts its D/A digital to analog converter U6 by telephone sound card on the server to analog voice signal after receiving this audio digital signals again, pass to outside calling party through public telephone network, finish voice transfer from the inside to the outside.Behind talk-through, then enter Fig. 6, S12 on-hook module shown in Figure 17.
Inside may further comprise the steps to outside call model:
A. after the network interface card U10 on the server received called phone digital signal from inner caller digital telephone extension set, then server entered outside line resource query module S7 under the control of Fig. 6, main control module S1 shown in Figure 12;
B.S7 obtains outside line resource status signal from public telephone state identifier U7, if outside line is No Assets, then send busy-back signal to the caller extension set by network interface card U10, otherwise, the called phone digital data transmission is given as Fig. 6, outward dialing module S8 shown in Figure 13;
The c.S8 module dials by dual-tone multifrequency/pulse signal generator U9 the called phone digital signal to public telephone network, and directly enter Fig. 6, inside/outside line connectivity module S9 shown in Figure 14 work;
The d.S9 module will convert audio digital signals to by analog to digital converter U5 from the called analog voice signal of public telephone network, electronic computer by server is passed to caller digital telephone extension set by network interface card U10 and network data line 12, finish voice transfer from outside to inside, and the audio digital signals that caller digital telephone extension set sends is transferred to the electronic computer of server by network interface card U10 and network data line 12, convert its digital to analog converter U6 to analog voice signal by electronic computer again and pass to outside callee, finish voice transfer from the inside to the outside through public telephone network by telephone sound card on the server.Above-mentioned steps realizes inner calling and conversation to the outside, then enters Fig. 6, on-hook module S12 shown in Figure 17 behind talk-through.
Inside may further comprise the steps to inner call model:
A. after the network interface card U10 on the server received call signal from caller digital telephone extension set, as Fig. 6, shown in Figure 15, server entered under main control module S1 control as Fig. 6, called extension set name shown in Figure 9 and works with purpose Web site query module S4;
The b.S4 module becomes completely restricted extension network address signal with called internal digital extension set conversion of signals by the referral web site database, and is transferred to Fig. 6, called call extension module S5 shown in Figure 10;
The c.S5 module is sent called call extension signal by the network interface card U10 and the network data line 12 of server to the called number digit extension, called extension set feedback extension set status signal busy tone or wait, after module S6 receives this status signal, send extension set state feedback signal to the caller extension set, finish the callwork of extension set and extension set by network interface card U10;
D. behind called number digit extension off-hook, server is under the S1 master control module controls, enter in as shown in figure 16 the S11/the interior lines connectivity module carries out work, S11 sends home extension intercom by network interface card U10 to extension set two and allows signal, extension set two is directly conversed by network after receiving this permission signal, finish completely restricted extension and converse mutually, enter the on-hook module behind the talk-through.
The present invention connects public telephone network and digital network again by set up relevant apparatus on universal or special computer, the analog signal conversion of public telephone network can be become digital signal, after can compressing according to different situations again by communication between various computer network patterns and arbitrary digital telephone extension set, realize that function of exchange, relevant apparatus can comprise telephone sound card, MODEN card, X.25 card, telecommunication card, resource expansion board and special-purpose software etc.Its network transmission system can be the universal or special digital network that various computers use, as NT net, NOVEL net etc.
What above embodiment was related is situation about using as telephone private branch exchange with a server, and can there be two or more servers in real system, each server is except that connecting public telephone network, also can be connected to each other by various Digital Medias such as Internet, satellite optical fiber etc., digital telephone extension set under the different server can be conversed by the communication between two servers, and server also can be supported strange land phone INCOM intercom.And related network address database can be arranged on server inside, also can be arranged in other network equipment that is connected with server by bus.
The present invention also can realize other function easily, comprises all basic functions, the management function of SPC telephone exchange and the function that some are unique.
Utilizing principle of the present invention can realize too with the office exchange is the telephone switching system of core.
Claims (12)
1. a local area network digital telephone exchange system comprises telephone exchange, subsets and transmission line, it is characterized in that: described subsets are digital telephone extension sets; Described transmission line is the computer network data line; Described telephone exchange is the server that is connected and composed by electronic computer, network interface card and telephone sound card, telephone sound card and network interface card are connected with the bus of electronic computer respectively, described network interface card also is connected with the computer network data line, described telephone sound card also is connected with public telephone network, and described digital telephone extension set is connected on the computer network data line.
2. local area network digital telephone exchange system according to claim 1 is characterized in that: described computer network data line comprises computer special use or the general digital grid line that contains NT net, NOVEL net.
3. local area network digital telephone exchange system according to claim 1, it is characterized in that: described server has more than two or two, server more than two or two connects public telephone network respectively, and the server more than two or two is connected to each other by the Digital Media that comprises Internet, satellite optical fiber.
4. local area network digital telephone exchange system according to claim 1, it is characterized in that: described digital telephone extension set is the multimedia computer that includes special-purpose software, be made up of CPU and the network interface card that is connected with CPU, sound card and sending of being connected with sound card, receiver, described network interface card connects described network data line.
5. local area network digital telephone exchange system according to claim 1, it is characterized in that: described digital telephone extension set is the computer that adds special digital phonecard and software, the special digital phonecard be plugged in the expansion slot of computer and connect give, receiver, also include network interface card, connect computer and described network data line.
6. local area network digital telephone exchange system according to claim 1, it is characterized in that: described digital telephone extension set is made up of an ordinary telephone set and a jockey, and this jockey includes central processing unit, read-only memory, random access memory, A/D converter, D/A, input/output interface controller, network interface and speech/double-audio signal processor; Described read-only memory, random access memory and input/output interface controller are connected with central processing unit respectively, described network interface is connected with the input/output interface controller and is connected with described network data line, described input/output interface connects A/D converter, D/A and speech/double-audio signal processor respectively, and described speech/double-audio signal processor connects ordinary telephone set.
7. local area network digital telephone exchange system according to claim 1, it is characterized in that: described digital telephone extension set is the special digital telephone set, comprise central processing unit, read-only memory, random access memory, the input/output interface controller, keyboard, A/D converter, D/A and network interface, described read-only memory, random access memory and input/output interface controller connect central processing unit respectively, described keyboard, A/D converter, D/A and network interface connect the input/output interface controller respectively, and described network interface is connected with described network data line.
8. local area network digital telephone exchange system, include outside to inner call model, inner to outside call model and inner to inner call model, it is characterized in that:, and set up network address database with corresponding relation between extension telephone number and its network address for each digital telephone extension set is provided with a network address; With the server that connects to form by electronic computer, telephone sound card and network interface card as bridge, make between public switched telephone network (PSTN) and each digital extension set and set up the computer numeral network, utilize the identification of computer numeral network technology, forwarding dual-tone multifrequency/pulse signal to set up calling and called telephone subscriber's annexation and carry out the calling and called two-way voice transmissions by digital-to-analogue, analog-to-digital conversion.
9. local area network digital telephone exchange system according to claim 8, it is characterized in that: described outside further comprises to inner call model: described server is receiving that public telephone network provides the dialogue environment when calling out, obtain purpose numeral extension telephone data earlier, find purpose numeral extension telephone network address by the referral web site database again, and call intent numeral extension telephone, set up with public telephone network between be connected.
10. local area network digital telephone exchange system according to claim 8, it is characterized in that: described inside further comprises to outside call model: described server is when receiving the internal digital extension telephone to the call signal of external call, by server the digital call signal is outwards carried out the forwarding of touch-tone signal, set up with public telephone network between be connected.
11. local area network digital telephone exchange system according to claim 8, it is characterized in that: described inside further comprises to inner call model: when server receives that a certain digital extension telephone A calls out the digital call signal of another digital extension telephone B, the referral web site database finds the network address of purpose numeral extension telephone B, and by this network address purpose numeral extension telephone B is called out, set up being connected between digital extension telephone A and digital extension telephone B.
12. local area network digital telephone exchange system according to claim 8 is characterized in that: described network address database is based upon in other network equipment of the inside of described server or server outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99100139 CN1260657A (en) | 1999-01-11 | 1999-01-11 | Local area network digital telephone exchange system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 99100139 CN1260657A (en) | 1999-01-11 | 1999-01-11 | Local area network digital telephone exchange system |
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| CN1260657A true CN1260657A (en) | 2000-07-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1638390B (en) * | 2003-12-25 | 2013-05-08 | 冲电气工业株式会社 | A radio communication terminal adapter, radio communication terminal and connection program thereof |
| CN110944245A (en) * | 2019-12-17 | 2020-03-31 | 佛山市冰河电子科技有限公司 | Digital-analog integrated program-controlled subscriber exchanger |
-
1999
- 1999-01-11 CN CN 99100139 patent/CN1260657A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1638390B (en) * | 2003-12-25 | 2013-05-08 | 冲电气工业株式会社 | A radio communication terminal adapter, radio communication terminal and connection program thereof |
| CN110944245A (en) * | 2019-12-17 | 2020-03-31 | 佛山市冰河电子科技有限公司 | Digital-analog integrated program-controlled subscriber exchanger |
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