CN204119307U - A kind of using the system of VOIP phone as pstn telephone extension set - Google Patents

A kind of using the system of VOIP phone as pstn telephone extension set Download PDF

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Publication number
CN204119307U
CN204119307U CN201420118169.2U CN201420118169U CN204119307U CN 204119307 U CN204119307 U CN 204119307U CN 201420118169 U CN201420118169 U CN 201420118169U CN 204119307 U CN204119307 U CN 204119307U
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module
pstn
voip phone
pstn telephone
voip
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CN201420118169.2U
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Chinese (zh)
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李俊红
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Beijing Haichen Century Science And Technology Development Co ltd
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SHENZHEN TIANXINGJIAN ELECTRONICS CO Ltd
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Abstract

The utility model provides a kind of using the system of VOIP phone as pstn telephone extension set, this system comprises pstn telephone module (1), VOIP phone module (2) and controller (3), the audio frequency of pstn telephone module (1) exports and is connected with the audio frequency input of VOIP phone module (2), the audio frequency input of pstn telephone module (1) exports with the audio frequency of VOIP phone module and is connected, pstn telephone module (1) is by the connection of PSTN switch (13) with far-end PSTN terminal (12), VOIP phone module (2) is connected with N number of VOIP telephone terminal (5-x) as extension set by the service of the P2P webserver (4), controller (3) is connected with pstn telephone module (1) by first interface (8), and controller (3) is connected with VOIP phone module (2) by the second interface (9).Whereby, the utility model can will realize the function of VOIP phone as pstn telephone extension set.

Description

A kind of using the system of VOIP phone as pstn telephone extension set
Technical field
The utility model relates to PSTN(Public Switched Telephone Network, PSTN) wire communication technology, VOIP(Voice over Internet Protocol, voice-over-net phone) telephony, Internet technology.More specifically, the utility model relates to a kind of using the system of VOIP phone as pstn telephone extension set.
Background technology
Existing pstn telephone turns inside line needs a switch, and extension set is still PSTN telephone, and also need wiring, wiring installation is vast and numerous, and cost is very high; Increase a new extension set and just need increase circuit, very dumb; When extension subscriber is not or not extension set side, then phone cannot be connected, very not convenient.But, pstn telephone and inside line still extensively being used, especially at commercial applications.On the other hand, due to the fast development of smart mobile phone, panel computer and Internet technology, almost everybody, always and everywhere hold a VOIP phone.Special inside Private Branch Exchange PBX and extension seem waste very in this case, and VOIP phone does not play one's part to the full the inconvenience solving extension.
Utility model content
For above-mentioned problem, the purpose of this utility model is to provide using the system of VOIP phone as pstn telephone extension set, and it can will realize the function of VOIP phone as pstn telephone extension set.
To achieve these goals, the utility model provides a kind of using the system of VOIP phone as pstn telephone extension set, described system comprises pstn telephone module (1), VOIP phone module (2) and controller (3), the audio frequency of pstn telephone module (1) exports and is connected with the audio frequency input of VOIP phone module (2), the audio frequency input of pstn telephone module (1) exports with the audio frequency of VOIP phone module and is connected, described pstn telephone module (1) is by the connection of PSTN switch (13) with far-end PSTN terminal (12), described VOIP phone module (2) is connected with N number of VOIP telephone terminal (5-x) as extension set by the P2P webserver (4), wherein 1≤x≤N, described controller (3) is connected with described pstn telephone module (1) by first interface (8), and described controller (3) is connected with VOIP phone module (2) by the second interface (9).
During far-end PSTN terminal (12) caller, controller (3) controls pstn telephone module (1) off-hook by interface (8), and obtain extension number, by UART or USB interface (9), extension number is passed to VOIP phone module (2), VOIP phone module (2) can connect VOIP telephone terminal (5-x) accordingly.When VOIP telephone terminal (5-x) caller, controller (3) sends off hook signal by interface (9), and obtains pstn telephone number, controls pstn telephone module (1) off-hook and dial number number by interface (8).Thus set up the connection with far-end PSTN terminal (12) by PSTN switch (13).Talk-through, first both sides all can take out stitches, and will automatically disconnect after the other side detects, release circuit and port.Like this, VOIP phone (5-x) has just become the extension set of pstn telephone module (1) by said system.
According to system of the present utility model, described VOIP phone module (2) is connected with P2P server (4) by network interface card (205), and described P2P server (4) is connected with described VOIP telephone terminal (5-x) (1≤x≤N).
According to system of the present utility model, described pstn telephone module (1) comprises start-up circuit, two or four line change-over circuits, bell signal sample circuit, dial-up circuit, beep generator, dtmf decoder, busy tone detecting circuit and speaking circuit.
According to system of the present utility model, described controller (3) is by comprising MCU(301), start control circuit and ring detecting circuit.The MCU of controller (3) can be connected by the bell signal sample circuit of ring detecting circuit with pstn telephone module (1), obtains bell signal; The start-up circuit that can control pstn telephone module (1) by starting control circuit carries out off-hook, on-hook operation; The dual-tone dialing signal that it sends DTMF can be controlled by exporting binary-coded decimal to the dial-up circuit of pstn telephone module (1); Different prompt tones can be sent by exporting digital control its to beep generator; By the connection of the busy tone detecting circuit with pstn telephone module (1), obtain busy tone state.Connected by UART or USB serial line interface between the CPU of MCU and the VOIP telephone terminal (2) of controller (3), controller (3) transmits hook-up command, extension number, hangup command to VOIP telephone terminal (2); Ring order, pstn telephone number, busy tone state information is obtained from VOIP telephone terminal (2).
According to system of the present utility model, described second interface (9) is UART or USB interface.
According to system of the present utility model, described ringing signal test circuit is connected with the bleeder circuit be connected across between A, B in pstn telephone module (1).Bell signal can wake the MCU(301 in controller (3) up by ringing signal test circuit) and trigger corresponding actions.
According to system of the present utility model, the MCU(301 in controller (3)) be connected to control beep generator as required with the beep generator (105) in pstn telephone module (1) and send the multiple prompt tone such as " busy tone ", " requesting extension number ".
According to system of the present utility model, the MCU(301 in controller (3)) be connected to dtmf decoder (106) in pstn telephone module (1).Dtmf decoder (106) can obtain the DTMF double-audio signal transmitted by far-end, and be converted to BCD(binary coded decimal, binary-coded decimal system) code, and pass to MCU(301), this function can be used for identifying the extension number that transmits of far-end.
According to system of the present utility model, the MCU(301 in controller (3)) be connected to busy tone identification circuit (107) in PSTN module.Busy tone identification circuit (107) can obtain the busy tone transmitted by PSTN switch, and makes itself and MCU(301) port level that is connected occurs that logic changes, this function can be used for identifying far-end hook state.
In the utility model, first to set up pstn telephone module (1) to be connected with the audio frequency of VOIP phone module (2), the audio frequency of pstn telephone module (1) exports and links together with the audio frequency input of VOIP phone module (2), and the audio frequency input of pstn telephone module (1) exports with the audio frequency of VOIP phone module and links together.Like this, be connected when pstn telephone module (1) establishes with far-end PSTN terminal (12), when VOIP phone module (2) and VOIP telephone terminal (5-x) also establish and be connected simultaneously, the voice communication in fact just established between far-end PSTN terminal (12) with VOIP telephone terminal (5-x) is connected.The Main Function of controller (3) is exactly help above-mentioned two realizations connected, when far-end PSTN terminal (12) caller, controller (3) controls pstn telephone module (1) off-hook by interface (8), and obtain the extension number that far-end PSTN terminal (12) transfers to, by UART or USB interface (9), extension number is passed to VOIP phone module (2), VOIP phone module (2) can connect VOIP telephone terminal (5-x) accordingly.When VOIP telephone terminal (5-x) caller, controller (3) sends off hook signal by interface (9), and obtain the pstn telephone number that VOIP telephone terminal (5-x) transfers to, control pstn telephone module (1) off-hook by interface (8) and dial number number.Thus set up the connection with far-end PSTN terminal (12) by PSTN switch (13).The another one effect of controller is taken out stitches, and disconnects.Talk-through, when far-end PSTN terminal (12) active on-hook, PSTN switch detects this on-hook signal, just send busy tone to pstn telephone module (1), controller (3) can obtain this busy-back signal, then by sending hangup command with the serial line interface (9) of VOIP phone module (2) to it, realizes work of taking out stitches, disconnect, release port.When VOIP telephone terminal (5-x) active on-hook, hook state information is sent to VOIP phone module (2), this on-hook information is passed to controller (3) by serial line interface by VOIP phone module (2), and controller (3) sends on-hook signal by starting control circuit control pstn telephone module (1).
Accompanying drawing explanation
Fig. 1 is that the utility model is a kind of using the theory diagram of VOIP phone as the system of pstn telephone extension set;
Fig. 2 is that the utility model is a kind of using the circuit diagram of VOIP phone as the system of pstn telephone extension set; .
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Principle of the present utility model illustrates:
The utility model is a kind of using the system of VOIP phone as pstn telephone extension set, comprise pstn telephone module (1), VOIP phone module (2) and controller (3), the audio frequency of pstn telephone module (1) exports and is connected with the audio frequency input of VOIP phone module (2), the audio frequency input of pstn telephone module (1) exports with the audio frequency of VOIP phone module and is connected, pstn telephone module (1) is by the connection of PSTN switch (13) with far-end PSTN terminal (12), VOIP phone module (2) is connected with N number of VOIP telephone terminal (5-x) as extension set by the P2P webserver (4), wherein 1≤x≤N, controller (3) is connected with pstn telephone module (1) by first interface (8),
Controller (3) is connected with VOIP phone module (2) by the second interface (9).Wherein, pstn telephone module (1) comprises start-up circuit, two or four line change-over circuits, bell signal sample circuit, dial-up circuit, beep generator, dtmf decoder, busy tone detecting circuit and speaking circuit.
During far-end PSTN terminal (12) caller, controller (3) controls pstn telephone module (1) off-hook by interface (8), and obtain extension number, by UART or USB interface (9), extension number is passed to VOIP phone module (2), VOIP phone module (2) can connect VOIP telephone terminal (5-x) accordingly.When VOIP telephone terminal (5-x) caller, controller (3) sends off hook signal by interface (9), and obtains pstn telephone number, controls pstn telephone module (1) off-hook and dial number number by interface (8).Thus set up the connection with far-end PSTN terminal (12) by PSTN switch (13).Talk-through, first both sides all can take out stitches, and will automatically disconnect after the other side detects, release circuit and port.Like this, VOIP phone (5-x) has just become the extension set of pstn telephone module (1) by said system.
Controller (3) is by comprising MCU(301), start control circuit and ring detecting circuit.Ringing signal test circuit is connected with the bleeder circuit be connected across between A, B in pstn telephone module (1), the MCU of controller (3) can be connected by the bell signal sample circuit of ring detecting circuit with pstn telephone module (1), obtain bell signal, also namely bell signal can wake the MCU(301 in controller (3) up by ringing signal test circuit) and trigger corresponding actions; Controller (3) can control pstn telephone module (1) start-up circuit by starting control circuit carries out off-hook, on-hook operation; Controller (3) can control by exporting binary-coded decimal to the dial-up circuit of pstn telephone module (1) the dual-tone dialing signal that it sends DTMF; MCU(301 in controller (3)) be connected with the beep generator (105) in pstn telephone module (1), different prompt tones can be sent, as " busy tone ", " requesting extension number " by exporting digital control its to beep generator; By the connection of the busy tone detecting circuit with pstn telephone module (1), obtain busy-back signal.Connected by UART or USB serial line interface between the CPU of MCU and the VOIP telephone terminal (2) of controller (3), controller (3) transmits hook-up command, extension number, hangup command to VOIP telephone terminal (2); Ring order, pstn telephone number, busy tone state information is obtained from VOIP telephone terminal (2).
MCU(301 in controller (3)) be connected to dtmf decoder (106) in pstn telephone module (1).Dtmf decoder (106) can obtain the DTMF double-audio signal transmitted by far-end, and be converted to BCD(binary coded decimal, binary-coded decimal system) code, and pass to MCU(301), this function can be used for identifying the extension number that transmits of far-end.MCU(301 in controller (3)) be connected to busy tone identification circuit (107) in PSTN module.Busy tone identification circuit (107) can obtain the busy tone transmitted by PSTN switch, and makes itself and MCU(301) port level that is connected occurs that logic changes, this function can be used for identifying far-end hook state.
Particularly, as depicted in figs. 1 and 2, system of the present utility model is formed primarily of pstn telephone module (1), VOIP phone module (2), controller module (3) three part.Pstn telephone terminal (12), the P2P webserver (4), VOIP telephone terminal set (5) are the part of the whole main frame of composition and extension set communication system.The set (5) of VOIP telephone network terminal is made up of VOIP telephone terminal (5-x) (1≤x≤N), as N platform extension set of the present invention.VOIP phone module (2) and each VOIP telephone terminal (5-x) (1≤x≤N) have a unique ID number, and with this No. ID in the upper registration of P2P server (4).The id number of VOIP phone module (2) is mapped as host number HOST-ID, and No. ID of each VOIP telephone terminal (5-x) can be mapped as an extension number EXT-ID.All No. ID, and HOST-ID, EXT-ID of mapping are stored in the FLASH ROM(208 in VOIP phone module (2)) in the middle of.
Because P2P server (4) has fixing IP address in the Internet, whenever can initiate to connect to P2P server (4) at the upper registered VOIP phone of P2P server (4) for any one, and connect in P2P server (4) permission situation.And due to network VOIP phone general unfixing IP address in the Internet, only have interim IP address.Therefore, VOIP phone module (2) can not directly and VOIP phone (5-x) connect.In fact, the VOIP phone module (2) in system of the present invention and VOIP telephone terminal (5-x) (1≤x≤N) need timing frequent connection P2P server (4), by the IP address of self notice P2P server (4).Like this, when the temporary ip address of VOIP phone changes, P2P server (4) just can be known in time.Further, the information whether VOIP phone (5-x) is online can be obtained.VOIP telephone terminal (2) also can obtain the whether online information of VOIP phone (5-x) when timing connects P2P server.
During far-end PSTN terminal (12) caller, by Ring1-Ring2 from PSTN switch (13) to pstn telephone module (1) between send bell signal, AC signalling signal passes on rectifier bridge (102) by resistance R0, after rectifier bridge changes AC signalling signal into direct current, by R2 and R3 dividing potential drop, voltage V1 significantly raises, V1 > Vref, the output state of comparator CP1 is reversed to high level by low level, MCU(301) after I/O-2 receives this reverse signal, first the level of I/O-1 port is reversed to low level by high level, transistor T1 conducting, drive the coil of relay HK that relay HK is closed, the hook switch being equivalent to telephone set is depressed, off hook signal is sent to PSTN switch, then beep generator (105) is driven to sound " requesting extension number " by SPI universal serial bus, the above-mentioned prompt tone sent is sent to PSTN circuit by R7, T2, rectifier bridge (102), pstn telephone terminal (12) is passed to by PSTN switch (13), after the user of pstn telephone terminal (12) hears this prompt tone, transfer to extension number.The extension number DTMF double-audio signal transferred to passes to pstn telephone module (1), decoding through dtmf decoder (106) exports binary-coded decimal, pass to MCU by SPI universal serial bus, one one ground receives, and so just can receive the extension number of multidigit.Can determine that receiving a few secondary data just stops accepting according to the extension number figure place of setting in advance.
The MCU(301 of controller (3)) obtain extension number EXT-ID after, first send off-hook information by UART or USB interface to VOIP phone module (2), start VOIP phone module (2).Then by UART or USB interface, this EXT-ID is sent to the CPU(206 of VOIP phone module (2)).CPU(206) unique ID number of corresponding VOIP phone is found by inquiry, VOIP phone module (2) is connected with P2P server (4) by network interface card (205), first the state obtaining VOIP telephone terminal (5-x) determines whether online, if online, on P2P server (4), send the call request of No. ID pointing to VOIP phone (5-x), the temporary ip address of VOIP phone module (2) to VOIP telephone terminal (5-x) forwarded call request, and is sent to VOIP phone (5-x) by Internet by P2P server (4).
As now VOIP telephone terminal (5-x) is just busy, then set up TCP or UDP with VOIP phone module (2) and be connected, and send the network and short message of " just busy ".The MCU(301 of controller (3)) received the information of " just busy " sent by VOIP phone module (2) by UART or USB serial ports after, control beep generator by spi bus and send " busy tone " audio signal, audio signal is sent to by rectification circuit (102) and the closing contact of relay HK on the PSTN circuit that Ring1-Ring2 is connected through the audio amplifier circuit that is made up of transistor T2, resistance R5.The MCU(301 of same Time Controller (3)) by UART asynchronous serial port or the USB port CPU(206 to VOIP phone) send on-hook order, take out stitches.
As now VOIP phone (5-x) is in idle condition, loud speaker is then driven to send ring back tone, prompting user has incoming call, as user's off-hook then VOIP phone (5-x) accept, from the call request of VOIP phone module (2), to set up TCP or UDP with VOIP phone module (2) and be connected.Audio output AUDIO OUT due to the call module (108) of pstn telephone module (1) has received audio frequency amplifier OP (201) the input AUDIO IN of VOIP phone module (2), so the speech of user that far-end PSTN terminal (12) obtains can send to the audio input amplifier OP (201) of VOIP phone module (2) by the call module (108) of pstn telephone module (1), and be loaded in network data by CPU after ADC analog-to-digital conversion and be sent to VOIP telephone terminal (5-x), earphone or loud speaker is driven to sound.
In like manner, speaking circuit (108) audio input end AUDIO IN due to pstn telephone module (1) has received the audio frequency amplifier OP (202) of VOIP phone module (2)) output, so the voice signal that the networking telephone (5-x) that VOIP phone module (2) receives is sent can by DAC digital-to-analogue conversion, OP202 passes to the speaking circuit (108) of pstn telephone module (1) after amplifying, and be sent on PSTN network by the circuit-closing contacts of rectifier bridge (102) and relay HK, far-end pstn telephone terminal (12) is passed to again through PSTN switch (13), receiver or hand-free loudspeaker is driven to sound.Like this, the full-duplex voice communication of VOIP phone (5-x) and far-end pstn telephone terminal (12) is just established.
On the contrary, if when VOIP phone (5-x) is as caller, dialing interface is first dialled prefix number " 0 " or " 9 ", or the prefix number dialing outside line pstn telephone of other agreement, expression will dial outside line pstn telephone.VOIP telephone terminal (5-x) connects P2P server, obtain the information whether VOIP phone module (2) is online, the call request pointing to VOIP phone module (2) unique ID number is then sent to P2P server as online, and the temporary ip address of self is issued P2P server, P2P server forwards the call request of VOIP phone (5-x) to VOIP phone module (2).
As now VOIP phone module (2) hurries, then set up network with VOIP phone (5-x) and be connected, and send the network and short message of " just busy " to the other side.After VOIP phone (5-x) receives called " just busy " network and short message, drive earphone or loud speaker to send busy tone, prompting user is called just busy.User can on-hook, takes out stitches.
As VOIP phone module (2) is idle, VOIP phone module (2) sends ringing information to controller (3), after controller (3) receives ringing information, hook-up command is sent to VOIP phone module (2), VOIP phone module (2) accepts request, and sets up TCP or UDP network with VOIP phone (5-x) and be connected.Then the telephone number of far-end PSTN terminal (12) is issued VOIP phone module (2) by VOIP phone (5-x), CPU (206) receives this number and this number is passed to the MCU (301) of controller (3) by UART or USB port, first I/O-1 port is set to low level by MCU (301), relay HK coil motion is driven by T1, R1, make the junction closure of relay HK, this action is that pstn telephone module (1) have issued off hook signal to PSTN switch (13).Then, MCU(301) number is disassembled the binary-coded decimal into 4BIT, send to DTMF generator (104) that the audio signal of dual-tone multifrequency occurs by SPI universal serial bus, and after signal stabilization, open dtmf signal output by SPI serial bus control, Ring1 is transferred to by the circuit-closing contacts of R6, T2, R5 and rectifier bridge (102) and relay HK---Ring2 interface, namely on PSTN transmission line, pass to PSTN switch (13).Each binary-coded decimal all needs to repeat to export once through said process, last PSTN switch (13) obtains the telephone number of complete far-end pstn telephone terminal (12), and according to this number, check the state of far-end pstn telephone terminal (12), if far-end pstn telephone terminal (12) state is " hurrying ", then return " busy tone " audio signal to pstn telephone module (1), this audio signal can arrive the speaking circuit of pstn telephone module (1), and the audio input end of VOIP phone module (2) is exported to through Audio out port, VOIP telephone terminal (5-x) is sent to by VOIP phone module (2), loud speaker or headset earpiece is driven to send busy tone, user hears rear on-hook, take out stitches.
If far-end pstn telephone terminal (12) state is " free time ", then PSTN switch (13) distally pstn telephone terminal (12) send bell signal.After person's off-hook to be used, just establish VOIP phone (5-x) and the full-duplex voice communication of far-end pstn telephone terminal (12), had before audio transmission process and described, repeated no more here.
No matter which side is caller, and which side is called, after end of conversation, all can complete whole work of taking out stitches.If VOIP telephone terminal (5-x) first sends on-hook signal to VOIP phone module (2), then VOIP phone module (2) disconnects and being connected with TCP or UDP of VOIP telephone terminal (5-x), releasing network port, the simultaneously CPU(206 of VOIP phone module (2)) to the MCU(301 of controller (3)) send hangup command, it is high level that the MCU (301) of controller (3) puts port I/O-1, transistor T1 ends, the coil blackout of relay HK, the normal opened contact of relay HK disconnects, be equivalent to the hook switch pressure of telephone set, on-hook signal is sent to PSTN switch (13), PSTN switch (13) release pstn telephone module (1) and far-end pstn telephone terminal (12) take switch ports themselves, now the telephone number of pstn telephone module (1) and far-end pstn telephone terminal (12) correspondence is in " free time " state.So just complete action of all taking out stitches.
On the contrary, if far-end pstn telephone terminal (12) first on-hook, PSTN switch (13) just discharges the switch ports themselves that far-end pstn telephone terminal (12) takies, and send busy tone to pstn telephone module (1), busy tone identification circuit (107) in pstn telephone module (1) identifies busy tone, I/O-3 port is set to low level, it is high level that MCU (301) detects that this low level puts port I/O-1, transistor T1 by, the coil blackout of relay HK, the normal opened contact of relay HK disconnects, be equivalent to the hook switch pressure of telephone set, on-hook signal is sent to PSTN switch (13), PSTN switch (13) release pstn telephone module (1) takies switch ports themselves, now the telephone number of pstn telephone module (1) and far-end pstn telephone terminal (12) correspondence is all in " free time " state.This completes the action of taking out stitches of PSTN network side.Then the MCU(301 of controller (3)) by UART or USB serial line interface, hangup command is passed to the CPU(206 of VOIP phone module (2)), CPU(206) hangup command is issued VOIP telephone terminal (5-x), VOIP telephone terminal (5-x) disconnects and being connected with TCP or UDP of VOIP phone module (2), releasing network port, completes action of all taking out stitches.
More than said process, achieve far-end pstn telephone terminal (12) by dialing the telephone number of pstn telephone module (1), the overall process dial the connection between extension number foundation with VOIP telephone terminal (5-x) after connecting again, conversing, take out stitches; Achieving VOIP telephone terminal (5-x) by dialing the number call VOIP phone module (2) of special code " 0 " or " 9 " or other agreement, after connecting, dialling the overall process that the telephone number of far-end pstn telephone terminal (12) and far-end pstn telephone terminal (12) connect, converse, take out stitches again.Thus achieve all functions of VOIP telephone terminal (5-x) as the extension set of pstn telephone module (1).
Be appreciated that above description and accompanying drawing are only used for explaining the utility model, obviously, additive method also can be adopted under the utility model ambit to change and amendment the utility model not departing from.

Claims (8)

1. using the system of VOIP phone as pstn telephone extension set, it is characterized in that, described system comprises pstn telephone module (1), VOIP phone module (2) and controller (3),
The audio frequency of pstn telephone module (1) exports and is connected with the audio frequency input of VOIP phone module (2), the audio frequency input of pstn telephone module (1) exports with the audio frequency of VOIP phone module and is connected, described pstn telephone module (1) is by the connection of PSTN switch (13) with far-end PSTN terminal (12), described VOIP phone module (2) is connected with N number of VOIP telephone terminal (5-x) as extension set, wherein 1≤x≤N;
Described controller (3) is connected with described pstn telephone module (1) by first interface (8), and described controller (3) is connected with VOIP phone module (2) by the second interface (9).
2. system according to claim 1, it is characterized in that, described VOIP phone module (2) is connected with P2P server (4) by network interface card (205), described P2P server (4) is connected with described VOIP telephone terminal (5-x), wherein 1≤x≤N.
3. system according to claim 1, it is characterized in that, described pstn telephone module (1) comprises start-up circuit, two or four line change-over circuits, bell signal sample circuit, dial-up circuit, beep generator, dtmf decoder, busy tone detecting circuit and call module.
4. system according to claim 1, is characterized in that, described controller (3) is by comprising MCU(301), start control circuit and ring detecting circuit.
5. system according to claim 1, is characterized in that, described second interface (9) is UART or USB interface.
6. system according to claim 4, is characterized in that, described ringing signal test circuit is connected with the bleeder circuit be connected across between A, B in pstn telephone module (1).
7. system according to claim 4, it is characterized in that, the MCU (301) in controller (3) is connected to control beep generator as required with the beep generator (105) in pstn telephone module (1) and sends multiple prompt tone.
8. system according to claim 4, is characterized in that, the MCU (301) in controller (3) is connected to the dtmf decoder (106) in pstn telephone module (1).
9. system according to claim 4, is characterized in that, the MCU (301) in controller (3) is connected to the busy tone identification circuit (107) in PSTN module.
CN201420118169.2U 2014-03-14 2014-03-14 A kind of using the system of VOIP phone as pstn telephone extension set Expired - Fee Related CN204119307U (en)

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Granted publication date: 20150121