CN100377557C - ADSL network telephone and method of carrying out such ADSL network telephone - Google Patents
ADSL network telephone and method of carrying out such ADSL network telephone Download PDFInfo
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- CN100377557C CN100377557C CNB200410026523XA CN200410026523A CN100377557C CN 100377557 C CN100377557 C CN 100377557C CN B200410026523X A CNB200410026523X A CN B200410026523XA CN 200410026523 A CN200410026523 A CN 200410026523A CN 100377557 C CN100377557 C CN 100377557C
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Abstract
The present invention discloses an ADSL network telephone set which combines an ADSL broadband access technology and an IP telephone technology. When an ADSL network telephone is realized, an incoming call course comprises: a high-frequency signal is separated out from signals transmitted by a telephone line by an ADSL separator (5); the high-frequency signal is processed by a high-frequency signal switching circuit (4) so as to be switched into an IP data packet; an IP telephone data packet in the IP data packet is classified and inspected by a central control circuit (1); the IP telephone data packet is transmitted to a speech compression coding and decoding circuit (3) by the central control circuit so as to be decompressed and decoded; a speech signal is output to a PSTN telephone unit (2) after the decompression and the decoding; an answering course is in reverse. A traditional telephone, an IP telephone and broadband Internet surfing access can be simultaneously dialed by the ADSL network telephone set of the present invention via a traditional twisted pair telephone line. An IP address of a public network is directly obtained by the ADSL network telephone set without dialing an accessing number so that zero telephone fee of an IP telephone terminal is really realized.
Description
[technical field]:
The present invention relates to a kind of network telephone and networking telephone implementation method.
[background technology]:
ADSL (ADSL (Asymmetric Digital Subscriber Line)) technology is current topmost a kind of broadband access technology, it utilizes the traditional subscriber's telephone line of PSTN, be implemented on the telephone wire and not only transmit traditional analog telephone signal but also transmit data-signal at a high speed, ADSL MODEM is modulated into the digital signal that terminal equipment is sent here to be adapted at the defeated signal of telecommunication of phone line, simultaneously the line signal that receives is demodulated to a kind of equipment of digital signal.By adopting the ADSL access technology, broadband internet and traditional PSTN net have been linked into huge numbers of families through a twisted pair telephone line.So just make an ordinary telephone line both can beat traditional pstn telephone, can number beat IP phone by dialing IP telephone access again, the while can also surf the Net into reality.
IP telephony technology is with behind digitized voice or the compressed coding of vision signal, and the form of wrapping with IP transmits on local area network (LAN) or the Internet, is reduced into voice or video at receiving terminal.The Session Initiation Protocol of H.323 announcing with IETF that the agreement that IP phone adopts mainly contains that ITU-T announces, voice great advantage of transmitted in packets on network is exactly that cost is low, because be shared communication channel, but not monopolizes; Another benefit is to be convenient to realize (NGN) network of future generation, promptly carries out multimedia transmission on packet network.
Traditional telephone network is used phone number mark user, and the internet mainly adopts ICP/IP protocol, and the secondary ip address of establishing on the network comes addressing, so every IP phone all needs an IP address, the IP address can be static, also can be dynamic assignment.If on public network the IP address of static allocation, two IP phone just can be dialled the other side IP address and call out; If on public network the IP address of dynamic assignment, in a single day IP phone connects public network, will reach IP address allocated to an identifier that is fixed in the server registration oneself on the public network, if call out another IP phone, will use the IP address of the number the dialled IP phone machine of this number correspondence of inquiry to the server, if inquire the IP address, just with this IP address call the other side.But there is following problem in the IP phone of using at present:
1.IP phone is as if the static ip address that uses on the public network, cost is too high;
2.IP phone can't directly distribute dynamic IP addressing on public network;
3.IP phone generally is positioned at private network, insert public network by gateway or acting server, but gateway or acting server generally all has fire compartment wall, how to make IP phone firewall-penetrating and the extraneous obstacle of having communicated by letter and being difficult to go beyond into.
[summary of the invention]:
Purpose of the present invention is exactly in order to overcome the above problems, a kind of dynamic IP addressing that public network obtains the ISP distribution that at first is suitable for directly inserting is provided, and can avoid integrated plain old telephone, the IP phone of fire compartment wall, take second place also with the implementation method of the ADSL network telephone and the ADSL networking telephone of ADSL broadband access function.
For achieving the above object, the present invention proposes a kind of ADSL network telephone, comprises central control circuit 1, the pstn telephone unit 2, compress speech coding-decoding circuit 3, high-frequency signal change-over circuit 4 and the ADSL separator 5 that are connected with described central control circuit 1 respectively; ADSL separator 5 also is connected with pstn telephone unit 2, high-frequency signal change-over circuit 4 respectively, and described pstn telephone unit also is connected with described compress speech coding-decoding circuit 3.
Above-mentioned ADSL network telephone also comprises the ethernet interface circuit 6, the RS-232 interface circuit 7 that are connected with described central control circuit 1.
The present invention proposes a kind of ADSL networking telephone implementation method based on above-mentioned ADSL network telephone, the step that its realization is talked about is:
1) signal that is come by the telephone wire transmission that possesses the ADSL business is isolated high-frequency signal by the ADSL separator;
2) the IP packet is handled, is converted to high-frequency signal by the high-frequency signal change-over circuit;
3) detect wherein IP phone packet by the central control circuit branch;
4) carry out uncompressed encoding for the compress speech coding-decoding circuit IP phone data packet transmission;
5) behind the uncompressed encoding voice signal to output to the pstn telephone cell translation be voice;
The step that its realization is replied is:
1) voice messaging is accepted in the pstn telephone unit; 2) voice signal compresses, encodes through the compress speech codec unit, is transferred to central control circuit;
3) central control circuit is the IP packet by the IP agreement with the conversion of signals that the transmission of compress speech coding-decoding circuit comes;
4) with the IP packet through high-frequency signal change-over circuit modulation, signal transformation, and deliver on the telephone line after amplifying by the high-frequency signal change-over circuit.
In the above-mentioned ADSL networking telephone implementation method, in the step 3) that described realization is talked about, when central control circuit was told non-IP phone packet, then by the ADSL program module handles of central control circuit, network telephone was realized the broadband access network access function.In the step 1) that described realization is talked about, when the signal that is come by the telephone wire transmission is isolated low frequency signal by the ADSL separator, send the pstn telephone cell processing, realize common telephony functions.When network telephone is in that function of network phone is closed or during off-position, realizes common telephony functions.
Because adopted above scheme, the invention has the beneficial effects as follows: ADSL network telephone of the present invention both can be realized the IP phone function, can realize the black phone function again; Because the direct branch of central control circuit detects the IP phone packet and handles accordingly, make the IP phone packet must be through the ADSL program module handles, so the transmission of IP phone packet etc. are not through wherein router and fire compartment wall, and applied for the telephone wire of ADSL business by access, IP phone directly obtains public network IP address, need not make the IP phone terminal realize that really telephone expenses are zero by dialing Number for access.
The ADSL network telephone also is provided with Ethernet interface, RS-232 interface, possesses ADSL MODEM broadband access network access function.
[description of drawings]:
Fig. 1 is an ADSL network telephone theory diagram of the present invention;
Fig. 2 is the schematic block circuit diagram of ADSL network telephone embodiment of the present invention;
Fig. 3 is an ADSL network telephone embodiment software architecture diagram of the present invention;
Fig. 4 is an ADSL network phone system connection diagram of the present invention.
[embodiment]:
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
ADSL network telephone theory diagram as shown in Figure 1, ADSL network telephone of the present invention comprise central control circuit 1, the pstn telephone unit 2 that is connected with central control circuit 1 respectively, compress speech coding-decoding circuit 3, high-frequency signal change-over circuit 4 and ADSL separator 5, ethernet interface circuit 6, RS-232 interface circuit 7; ADSL separator 5 also is connected with pstn telephone unit 2, high-frequency signal change-over circuit 4 respectively, and the pstn telephone unit also is connected with compress speech coding-decoding circuit 3.
Fig. 2 is the hardware block diagram of ADSL network telephone embodiment, is divided into 8 unit:
1) the traditional PSTN telephone unit 2
This unit inserts telephone line by ADSL separator 5, it is the function that realizes traditional caller ID telephone that one communication MCU is arranged self, and finish key scan work, communicate by letter with central control unit 1 by serial interface circuit simultaneously, reception is from the order of central control unit, the state of reporting sends key assignments.The LCD display unit shows various incoming informations and system mode.When the ADSL networking telephone not during external power supply, the ADSL networking telephone is only realized the function of plain old telephone.
2) IP phone compress speech codec unit 3
This unit is realized by a slice CODEC chip, analogue voice signal is sampled after the AFE (analog front end) amplification filtering and is quantized, the laggard capable voice compression coding of digitlization, and G.723.1 selectable Coding Compression Algorithm has (5.3Kbps/6.3Kbps), G.711A/ μ restrains, G.729A.
3) the high-frequency signal change-over circuit 4
Comprise AFE analog front circuit 41 and DMT modulation-demodulation circuit 40, the ADSL AFE (analog front end) realizes that signal transformation, circuit amplify and the conversion of 2-4 line.The DMT modem section is finished the DMT modulation of baseband signal and the DMT demodulation work of line signal.The AFE analog front circuit comprises 2-4 line hybrid circuit, circuit amplification driving circuit, low-pass filter circuit, AGC automatic gain control circuit, A/D and D/A circuit.
4) ethernet interface circuit 6
This unit links to each other with the network interface card or the HUB of computer with direct-connected cable by Ethernet RJ-45 mouth.
5) the RS-232 interface circuit 7
This unit links to each other with the RS-232 interface of computer with direct-connected cable by the 9PIN D type head of RS-232.
6) power conversion unit
Power conversion unit is right+and the 12V DC power supply carries out conversion, needed 4 kinds of the DC power supply :+6V of generation system ,+3.3V ,+1.8V ,+18V.
7) central control circuit 1
Central control circuit adopts 32 embedded microprocessor, controls each unit co-ordination.
8) the ADSL separator 5: be used for the voice low frequency signal and the data high-frequency signal of the transmission of twisted-pair feeder words are separated; The voice low frequency signal send pstn telephone unit 2 to handle, and the data high-frequency signal send high-frequency signal change-over circuit 4 to handle.
Fig. 3 is the software architecture diagram of the ADSL networking telephone, bottom and hardware are come into contacts with, be boot and various driver, core is a uClinux operating system, application program C language compilation, major function have WEB configuration feature, LCD presentation control function, IP phone interactive function, software remote upgrade function, DynamicHost configuration feature, routing function, firewall functionality etc.
Fig. 4 is the networking schematic diagram of ADSL network phone system, the ADSL networking telephone is linked telephone office by traditional twisted pair telephone, the separator of local side will be simulated the low frequency voice signal and be separated with high-frequency data signal, and analogue voice signal enters the switching room of telephone office, thereby enters the PSTN net; High-frequency data signal router by ISP after ADSL MODEM demodulation enters broadband internet, and therefore, the compress speech signal of IP phone transmits through the Internet.If there is sip server to exist on the Internet, the ADSL network telephone is after having obtained the ISP IP address allocated, just register to sip server immediately, the information of registration has IP phone number, IP address allocated and the online information of ADSL telephone identifying code, appointment.The process that the ADSL networking telephone is initiated call is: at first dial the telephone number that will call out, whether inquiry the other side to the sip server is online according to telephone number, if online, just fetches the other side's IP address; Secondly with the IP address that obtains, adopt Session Initiation Protocol to make a call to the other side, if the other side's phone free time, will ring, and sending ALERTING message to the ADSL networking telephone that makes a call, the ADSL networking telephone is promptly sent the bell sound back to local microphone, if the other side's off-hook, this locality stops to send ring-back tone, enters the talking state of IP phone; If last side's on-hook, end of conversation, on-hook one side does not send busy tone, and as on-hook, call finishes.
When adopting the ADSL network telephone call of the above embodiment of the present invention, voice are compressed encoding after digitlization, breaks into the IP bag then, receives and sends via ADSL.The ADSL network telephone this in the telephone wire line of having applied for the ADSL business after, automatically be registered on the server of ADSL operator, obtain the IP address of dynamic assignment simultaneously, be positioned at identifier, IP phone number and the IP address of the sip server registration oneself on the public network then from trend, both can surf the Net now, can beat IP phone again, also can answer the phone that other IP phone machine is made.The IP phone number can be set up on their own by the user in principle, but,, then use the IP phone number that distributes if IP phone has been distributed number resource by code scheme E.164, otherwise directly use the pstn telephone number of this adsl line, perhaps adopt identifier as the IP phone number.
Speech low frequency signal and data high-frequency signal are separated by ADSL separator 5 from the line signal that telephone office brings in.Low frequency signal send black phone circuit pstn telephone unit 2 to handle, and realizes common telephony functions; High-frequency signal send ADSL analog front circuit 41 to handle, analog front circuit comprises 2-4 line hybrid circuit, the circuit amplification driving circuit, low-pass filter circuit, the AGC automatic gain control circuit, A/D and D/A circuit, hybrid circuit separates input/output signal, input signal after the separation send A/D change-over circuit after filtering and the control of AGC automatic gain, analog signal conversion is become digital signal, then, this digital signal is delivered to DMT modulation-demodulation circuit 40 and is carried out demodulation, signal after the demodulation is handled by central control circuit 1, central control circuit differentiates whether the IP packet of being received is the packet of IP phone, recognition methods is that the data of IP phone are surrounded by two kinds, the one, hello protocol (adopt H.323 or SIP or other) packet, the 2nd, VoP, receipt of call protocol data bag on fixed port, in calling procedure, the both sides of calling known the other side's IP address and the other side with the ip voice packet deliver to oneself on which port.So behind the access success, IP phone is monitoring reception ip voice packet on the port of determining just.The ip voice packet is transferred to the pstn telephone unit behind the uncompressed encoding of compress speech coding-decoding circuit 3, is converted to voice and exports from receiver.
What the ip voice packet adopted is Real-time Transport Protocol, transmits with UDP.Therefore, this machine is only determining to receive the UDP bag on the port.After receiving the UDP bag, at first judge the sender of UDP bag, whether be to transmit from the other side, if not, just abandon.Otherwise, judge further whether the bag of receiving is Real-time Transport Protocol, if not, just abandon.Be Real-time Transport Protocol, judge whether the Real-time Transport Protocol version that this machine is supported, if not, abandon.Be that the ip voice packet that this IP packet transmits for the other side then is described.Judge processing to this voice packet according to the packet number received and timestamp again: being that voice packet is overtime abandons or is put in the voice queue.
If what receive is not the packet of IP phone, then by the ADSL program module handles.So router and fire compartment wall in the ADSL program module are not passed through in the transmission of IP phone packet, successfully avoided the problem that IP phone need penetrate the Intranet fire compartment wall.The process of transmitting of signal is then opposite, central control circuit had both received from the link signal of Ethernet interface 6, also receive voice compression coding signal from compress speech coding-decoding circuit 3, after breaking into IP bag by the IP agreement, deliver to the DMT modulation-demodulation circuit and carry out the DMT modulation, carry out D/A conversion and circuit by the ADSL analog front circuit then and amplify and deliver on the telephone line, the traditional analog telephone signal is also delivered on the telephone line through the ADSL separator.
Claims (9)
1. an ADSL network telephone is characterized in that: comprise central control circuit (1), the pstn telephone unit (2) that is connected with described central control circuit (1) respectively, compress speech coding-decoding circuit (3), high-frequency signal change-over circuit (4) and ADSL separator (5); Described ADSL separator (5) also is connected with described pstn telephone unit (2), high-frequency signal change-over circuit (4) respectively, and described pstn telephone unit also is connected with described compress speech coding-decoding circuit (3).
2. ADSL network telephone as claimed in claim 1 is characterized in that: also comprise the ethernet interface circuit (6) that is connected with described central control circuit (1).
3. ADSL network telephone as claimed in claim 1 or 2 is characterized in that: also comprise the RS-232 interface circuit (7) that is connected with described central control circuit (1).
4. ADSL network telephone as claimed in claim 3, it is characterized in that: described high-frequency signal change-over circuit (4) comprises AFE analog front circuit (41), DMT modulation-demodulation circuit (40), described AFE analog front circuit (41) is connected with described ADSL separator (5), DMT modulation-demodulation circuit (40) respectively, and described DMT modulation-demodulation circuit (40) also is connected with described central control circuit (1).
5. ADSL networking telephone implementation method, the step that its realization is talked about is:
1) signal that is come by the telephone wire transmission that possesses the ADSL business is isolated high-frequency signal by the ADSL separator;
2) the IP packet is handled, is converted to high-frequency signal by the high-frequency signal change-over circuit;
3) detect wherein IP phone packet by the central control circuit branch;
4) carry out uncompressed encoding for the compress speech coding-decoding circuit IP phone data packet transmission;
5) behind the uncompressed encoding voice signal to output to the pstn telephone cell translation be voice;
The step that its realization is replied is:
1) voice messaging is accepted in the pstn telephone unit;
2) voice signal compresses, encodes through the compress speech codec unit, is transferred to central control circuit;
3) central control circuit is the IP packet by the IP agreement with the conversion of signals that the transmission of compress speech coding-decoding circuit comes;
4) with the IP packet through high-frequency signal change-over circuit modulation, signal transformation, and deliver on the telephone line after amplifying by the high-frequency signal change-over circuit.
6. ADSL networking telephone implementation method as claimed in claim 5, it is characterized in that, branch detecting method to the IP phone packet in the step 3) that described realization is talked about is: central control circuit is receipt of call protocol data bag on fixed port, set up and call out connection, determine the receiving port address of both sides IP address and ip voice packet; On the receiving port of determining, monitor the ip voice packet.
7. ADSL networking telephone implementation method as claimed in claim 6, it is characterized in that: in the step 3) that described realization is talked about, when central control circuit was told non-IP phone packet, then by the ADSL program module handles of central control circuit, network telephone was realized the broadband access network access function.
8. ADSL networking telephone implementation method as claimed in claim 5, it is characterized in that: in the step 1) that described realization is talked about, when the signal that is come by the telephone wire transmission is isolated low frequency signal by the ADSL separator, send the pstn telephone cell processing, realize common telephony functions.
9. as each described ADSL networking telephone implementation method among the claim 5-8, it is characterized in that: when network telephone is in that function of network phone is closed or during off-position, realizes common telephony functions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410026523XA CN100377557C (en) | 2004-03-13 | 2004-03-13 | ADSL network telephone and method of carrying out such ADSL network telephone |
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| CNB200410026523XA CN100377557C (en) | 2004-03-13 | 2004-03-13 | ADSL network telephone and method of carrying out such ADSL network telephone |
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| Publication Number | Publication Date |
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| CN1564563A CN1564563A (en) | 2005-01-12 |
| CN100377557C true CN100377557C (en) | 2008-03-26 |
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| CNB200410026523XA Expired - Fee Related CN100377557C (en) | 2004-03-13 | 2004-03-13 | ADSL network telephone and method of carrying out such ADSL network telephone |
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| CN107770184B (en) * | 2017-10-31 | 2020-02-18 | 中国电子科技集团公司第五十四研究所 | Multifunctional multiplexer of scattering communication system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336752A (en) * | 2000-08-01 | 2002-02-20 | 上海龙林通信技术有限公司 | IP telephone of wideband IP network |
| WO2002019666A2 (en) * | 2000-09-01 | 2002-03-07 | Nextlink.To A/S | A communications terminal, a system and a method for internet/network telephony |
| CN1373598A (en) * | 2002-04-05 | 2002-10-09 | 珠海华润通讯技术有限公司 | Speech communication method and broad-band telephone terminal using it |
| CN1455576A (en) * | 2002-04-18 | 2003-11-12 | 三星电子株式会社 | Digital subscriber-line modem and relevant method and computer programme product |
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2004
- 2004-03-13 CN CNB200410026523XA patent/CN100377557C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336752A (en) * | 2000-08-01 | 2002-02-20 | 上海龙林通信技术有限公司 | IP telephone of wideband IP network |
| WO2002019666A2 (en) * | 2000-09-01 | 2002-03-07 | Nextlink.To A/S | A communications terminal, a system and a method for internet/network telephony |
| CN1373598A (en) * | 2002-04-05 | 2002-10-09 | 珠海华润通讯技术有限公司 | Speech communication method and broad-band telephone terminal using it |
| CN1455576A (en) * | 2002-04-18 | 2003-11-12 | 三星电子株式会社 | Digital subscriber-line modem and relevant method and computer programme product |
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| CN1564563A (en) | 2005-01-12 |
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