TWI221723B - Silent redial system for VoIP modem - Google Patents

Abstract

A redial system for a VoIP modem includes a subscriber line interface circuit (SLIC) for interfacing analog telephone signals from a telephone set to the VoIP modem and for generating redial signals to a public switched telephone network (PSTN), a first relay for connecting the telephone set with the PSTN or connecting the telephone set with the SLIC, a dummy load, a second relay connected between the PSTN and the dummy load for establishing or de-establishing a connection between the PSTN and the dummy load, a third relay connected between the first relay and the SLIC for establishing or de-establishing a connection between the first relay and the SLIC, and a control means for controlling the second and third relays to establish the connection between the PSTN and the dummy load and de-establish the connection between the first relay and the SLIC during the generation of the redial signals.

Description

㈣ Cape father jL Chong- | Case No. 91119051____ Year, Month, and Day Five. Description of the Invention (1) Field of Invention The present invention provides an Internet telephone modem, especially an Internet telephone modem with a silent redial function. . Background of the Invention-A, I, V, ^, ^, J, W, J, Khan, Ding, You, Zhou, Ping, Shi Ping, Shi Ping, Shi Fei Shi, V V u IC (Over Internet Protocol, VoIP) The use of the time is also right. The main advantage of using Internet telephony is that it is much cheaper than traditional telephones that use the public switched telephone network (PSTN) as the upper-A pipeline. Already. However, the quality of 1 dismissal is not stable. Therefore, the number of Internet calls is the same as that of the Internet phone. It uses the public switched telephone network as the communication tube. First, it is good to have a public switched telephone network that can be switched to the unified system. As auxiliary pass = total f energy. Therefore, the n machine came into being. This type of network ^ two-way Internet phone number system is set to Internet phone mode, but also ^ data, its initial state away from the call channel, users can also use this type ^ ^ ^ using the Internet for; Switch to the traditional telephone mode, that is, use ^ :, the telephone modem is manually operated as 2 pipes. In addition, when this type of network connection is used, the telephone network is exhausted, and it is stored in the Internet telephone modem first. , Need to dial-special 119, 11 〇, etc., this type of network electricity number = phone number, for example :; to the traditional phone mode function: JJ machine must be able to automatically switch phone network as a communication channel Instead of c-stable public sex-like internet phone mode 1

1 ^, 91119051 _ ^ ______ Μ 9 _j ^ < T V. Description of the Invention (2) — The Internet is still used as a communication channel. When encountering the above-mentioned emergency situation, this type of VoIP modem will cut off the electrical connection between the telephone and a subscriber loop interface circuit, and then be electrically connected to the public switched telephone network, and automatically redial the number at the same time. Emergency phone number. Please refer to Figure 1. Figure 1 is a block diagram of the redialing system 10 of the conventional Internet phone modem. A mechanical relay 20 is used to selectively electrically connect a telephone 12 to a public switched telephone network 22 or to a customer circuit interface circuit 14. The user loop interface circuit 14 is used as an interface between analog telephone signals and Internet telephone digital signals, so that data such as sound can be converted to a data format and transmitted on the network. The VoIP modem re-dial system 10 also includes a send-receive detection circuit (of f-hook and ring detect circuit) 18, which is electrically connected to the public switched telephone network 22 and electrically connected to the telephone set 1 through the relay 2 0 , Used to detect the ring signal (incoming call) from the public switched telephone network 22 and the handset hook status of the phone 2 (〇ff-h ο 〇kstatus). The VoIP modem redial system 10 also includes a dual tone multi-frequency redial coupling circuit (DTMF redial coupling circuit) 16 which is electrically connected to the user circuit interface circuit 1 4 And the public switched telephone network 22 to transmit the redial signal from the subscriber loop interface circuit 14 to the public switched telephone network 22. When the Internet phone is not in a usable state (for example, it is not connected yet), the relay 20 electrically connects the telephone 12 to the public switched telephone network 22, and the call made by the user at this time will pass through Public switched telephone network

E! | Case No. 91119051_ Day Amendment V. Description of the Invention (3) Route 2 2 is transmitted out; when the internet telephone modem is in operation, the 'relay 2 0 will switch the telephone 12 to the electrical circuit. 1 4 In order to take advantage of Internet phone functions. The user can also set a switching code (p r e d e t e r m i n e d c 〇 d e), such as ‘* * * *’, etc., to manually control the relay 2 〇 to connect electricity to the public switched telephone network 2 2. Although the cost of dialing an internet phone modem is cheaper, and the quality of the phone modem is not stable enough, any user should make an important or emergency call while the phone suddenly disconnects the traditional public switched telephone network 2 2 as an auxiliary call As for the channel modem, when the user dials a telephone number that is stored in the modem in advance, for example, the data opportunity such as 11 9 and 1 10 will automatically switch to the public switched telephone network channel and automatically Redial the phone number dialed by the user for the telephone network instead of using the network as usual. In other words, the redial system of the internet telephone modem controls the relay 20 to electrically connect the telephone 12 to the public switched telephone and redials. If the dialing mode adopted by the telephone 12 is tone-dialing mode, the user loop interface ^ generates a DTMF redial signal, and transmits this signal to the public switched telephone network through the dual tone handle circuit 16 twenty two. If the dialing mode used by the telephone set 12 is pulse-dialing mode, the relay 20 will be charged and turned off to generate the correct number of dialing pulses. The home circuit interface dials a pre-phone 1 or 2 but the network should not want to connect. For the Internet phone, the Internet phone, the Internet phone will be sent to the public phone as the call pipe 1 0 will automatically call the network 2 2 and multi-frequency dialing route 1 4 will produce a multi-frequency re- Dial in another love mode to turn on the modem quickly

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Jil id Case No. 91119051 __ ^ η__j V. Description of the invention (4) The new dial-up system 10 uses this method to achieve automatic re-zeroing. The above-mentioned system, the redialing procedure is when the telephone is connected to the public switched telephone network 2 2 It is said that the user will hear the redialing sound of multi-frequency dialing or pulse dialing. Such annoying sounds often trouble the users of the telephone dial-up redialing system. The purpose and summary of the invention: "Sound network telephony" "Direct dial 12" ^ is #come to learn the static version of the network data machine, send a user back to the phone number, a pre-set redial modem to the phone user The public switch of the circuit cuts off the internet telephone circuit interface circuit of the public relay, the signal interface, the phone number signal to a public mute redialer, the selective electrical interface circuit, the telephone network, and the common exchange telephone. The network is connected to the user modem and at that time, the exchange number system was connected to t load ^ load $ and the static of the circuit was used to transfer the user's telephone network. This issue also includes the public voice system The home circuit is re-spoken. The interface includes a false negative electrical dialing between the first communal circuit and the electrical circuit. The relay relay of the telephone network device is selective and a second relay is used to select the electrical connection between the carriers. When the circuit and the first relay system include the number and the network circuit, a network telephone will be generated, which will be used to connect to the connection or to a third electrical device.

α 日 κ] χ -—-—_ Case No. 91119051 Amendment V. Description of the Invention (5) Interval 'is used to selectively establish or cut off the electrical connection between the user loop interface circuit and the second relay, And a controller for controlling the second relay to establish an electrical connection between the public switched telephone network and the dummy load when the redial is performed, and controlling the third relay to cut off the user loop interface circuit And the electrical connection between the first relay. For a detailed description of the invention, please refer to FIG. 2. FIG. 2 is a block diagram of the redial of the Internet telephone modem in accordance with the present invention = system 30. The redial system of the Internet telephone modem is 30 packets. It is used as the interface of the analog telephone signal and the digital telephone signal, so that the Internet telephone modem can transmit the analog telephone signal from the telephone 32 in the form of data ^ on the network. When the user circuit When the interface circuit 38 receives a preset telephone number, the preset telephone number is the telephone number stored in the Internet phone modem ($) in advance, it will generate a redial signal and send it to— Public switched telephone network 42. The redial system 30 of the VoIP modem further includes a first relay 40, which is preferably a mechanical relay, and is used to selectively electrically connect the telephone 32 to the public switched telephone network 42 or to the subscriber loop interface circuit 38. . The re-dial system 3 of the internet telephone modem further includes a dummy load 48, a second relay 50, and a third relay 36. The second and third relays 50 and 36 are preferably optically coupled relays. (Photo relay). The second relay 50 is electrically connected between the public switched telephone network 42 and the dummy load 48, and is used to selectively establish or cut off the electrical connection between the public switched telephone network 42 and the dummy load 48. The third relay ^

«___ 91Π9 ^ _Year Month Day Amendment V. Description of Invention (6) '-It is electrically connected between the first relay 40 and the user circuit interface circuit 38, and is used to selectively establish or cut off the first relay 4 〇 Electrical connection with the user loop interface circuit 38. The re-dial system 30 of the internet telephone modem also includes two control circuits 5 2 and 3 4 which are used to control the switching actions of the second and third relays 50 and 36 respectively. When the redial signal is generated, the second and third relays 50, 36 are controlled to establish the electrical connection between the public switched telephone network 42 and the dummy load 48, and cut off the first relay 4 and the user circuit. Electrical connection between interface circuits 38.

The re-dial system 30 of the network electrical modem also includes a transceiver detection circuit 4 4 which is electrically connected to the public switched telephone network 4 2 and is electrically connected to the telephone 3 2 through the first relay 40, for Detect the earphone hook status of the telephone 3 2 and the ringing message (incoming call) of the telephone sent from the public switched telephone network 4 2. The re-dial system 3 of the Internet telephone modem also contains ~ < tone-multi-frequency redial coupling circuit 4 6 which is electrically connected between the public switched telephone network 4 2 and the user circuit interface circuit 38. It is used to couple the redial signal to the transceiver detection circuit 44 and to isolate the voltage between the transceiver detection circuit 44 and the user circuit interface circuit 38. As is known in the art, when an emergency situation occurs, the VoIP modem preferably uses a more stable call channel such as the public switched telephone network 4 2 to transmit call information. For example, the VoIP phone A dialing rule or an emergency telephone number (such as 110, 119, etc.) is stored in the modem in advance. When a user makes a call using the Internet telephone modem, if the phone code matches the dialing rule or emergency telephone number, The VoIP modem

Page 10 122 Bi 23 Case No. 91119051 Month Revision ~

5. Description of the invention (7) The redial procedure will be started to establish a new telephone signal transmission channel based on prostitutes. The process of re-dialling is different for a phone that uses the dual-frequency dialing mode and a phone that is in the sweep mode. The dialing mode is the same as that of the dialing mode. ii to ΐ ϊ ΐ Ϊ 丄 The first relay 40 is switched to electrically connect the telephone 32 to the subscriber loop interface circuit 38, while the other second relay 5 is open and the third relay 36 is closed (cl. se). Please refer to FIG. 3. FIG. 3 is a flowchart of the mute two-tone multi-frequency redial procedure of the present invention applied to a telephone using multi-frequency dialing: Step 1 0 0: Start; Step 102: The user repeats Frequency dialing mode dials a number that matches the phone number stored in the telephone network modem, restarts the dialing process; step U4: the control circuit 52 sets the second relay 50 to off (the state of ci is 'false' The load 48 is electrically connected to the public switched telephone network 'Γ ϋ to provide the public switched telephone network 4 2 The state of lifting the handset (OFF-HOOK); == 106 · The control circuit 34 sets the third relay 36 to the on state, In order to cut off Lei Yesa ^, v pen; 38 of the electrical connection between electricity ^ 32 and the user circuit interface circuit Step 108: The user dials the signal of the old person and regenerates it through the double 1 facade electricity 4 channels 38-double, multi-frequency Re & ❿ Double "Frequency re-dialling coupling circuit mijp 16 μ month, winning number 91119051 Amendment V. Description of invention (8) 4 6 This signal is transmitted to the public switched telephone network 4 2; Step 1 1 0: No. A relay 4 0 is switched to switch the telephone 3 2 The male contact 42 switched telephone network; Step 112: The control circuit 34 is set to the third relay 36 off (Close) of state, to establish a first relay 40 electrically connected to the circuit 38 of the user interface circuit;

Step 114: The control circuit 52 sets the second relay 50 to an on state (0Pen) to cut off the electrical connection between the dummy load 48 and the public switched telephone network 42; and step 116: ends. Please note that steps 11 2 and 1 1 4 start after the redial signal is all generated, so that the VoIP modem redial system 30 can be reset to the original setting state. Please refer to FIG. 4. FIG. 4 is a flowchart of the mute pulse redial procedure of a telephone using the pulse dialing mode according to the present invention: Step 2 0: Start; Step 2 2: The user dials in the pulse dialing mode. A number that matches the phone number stored in the VoIP modem, re-start the dialing process;

Step 2 04: The control circuit 52 controls a relay to 50 by repeatedly turning it on and then turning it off to regenerate the dial pulse signal, and transmits this signal to the public switched telephone network 4 2 and the second relay ^ 5 0 is closed after the pulse dial signal is generated

16 1221 ^ 23 Rev. February 9 ¥: Case No. 91119051 Amended 5. Description of Invention (9) (c 1 〇se) state, fake load 48 is electrically connected to the public parent telephone network 4 2 to provide public Switching electrical network 4 2 Lifting the handset (OFF-HOOK); Step 2 0 6: The first relay 40 is switched to connect the telephone 3 2 to the public switched telephone network 4 2; Step 2 0 8 : The control circuit 52 sets the second relay 50 to an open state to cut off the electrical connection between the dummy load 48 and the public switched telephone network 42; and step 2 10: end.

Please note that step 208 starts after all the redial signals are generated, so that the VoIP modem redial system 30 can be reset to the original setting state.

Compared with the conventional technology, the Internet telephone modem redial system 30 of the present invention uses the second relay 50 and the third relay 36 to control the electrical connection between the telephone 32 and the public switched telephone network 42. When the user dials a phone number that matches the phone number that has been stored in the internet phone modem beforehand, the second relay 50 is closed (c 1 se) to establish a fake load 4 8 and the public switched telephone network 4 Electrical connection between 2 In addition, in the multi-frequency dialing mode, the third relay 36 is turned on (0pen) to cut off the electrical connection between the telephone 32 and the user and the circuit circuit 38. Because the redial signal and the telephone & are isolated, the user will not hear the sound of the two signals when the redial signal or redial pulse is transmitted to the public switched telephone network 4 2. Then, after the redial signal is transmitted ^

1221 ^ 23 jci ^ 93 · 1611 ^ 4 1 Case No. 91119051 _ revised month and year _ 5. Description of the invention (10) One relay 4 0 and the second relay 50 0 are switched to electrically connect the telephone 3 2 to the public exchange Telephone network 4 2. At this point, the VoIP modem re-dial system 30 completes the mute dialing process. This procedure can prevent users from being disturbed by the redial signal sound. The above description is only a preferred embodiment of the present invention, and any equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the invention patent.

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122 + 72 ^ ^ Mou Yue α Yue Bei Λ Female 'Private Case No. 91119051 Revised diagrams Simple illustrations Simple illustrations Figure 1 is a block diagram of the redial system of a known Internet telephone modem to indicate Internet telephone data The machine's silent redial system is shown in Figure 2. Figure 3 is a flowchart of the mute dual-tone multi-frequency redial procedure of a network circuit modem using the multi-frequency dial mode. Figure 4 is a flowchart of the mute dual-tone multi-frequency redial procedure of a network circuit modem in pulse dialing mode. Explanation of symbols in the figure 1 0, 3 0 Redial system of Internet telephone modem 1 2, 3 2 Telephone 14, 38 User circuit circuit 1 6 4 4 Dual tone multi-frequency redial coupling circuit 1 8, 4 4 Send and receive detection circuit 2 0 Mechanical relay 2 2, 4 2 Public switched telephone network 3 4, 5 2 Control circuit 36 Third relay 40 First relay 48 Fake load 50 Second relay

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Claims (1)

irv ίϋ Amend the year and year, "this | six, the scope of patent application I 1 ·" redial "system of" voice over Internet iprotocol modem (VoIP modem) ", including: user circuit interface circuit (Subscriber line interface cm feuit 'SLIC), which is used as the interface between the analog signal sent by a telephone and the digital signal of the 7-way telephone modem, and when the subscriber loop interface circuit receives a specific telephone number The subscriber loop interface circuit will generate a redial signal to a public switched telephone network (PSTN); a first relay for selectively electrically connecting the telephone to the public switched telephone network Or to the user loop interface circuit; a dummy load; a second relay electrically connected between the public switched telephone network and the dummy load for selectively establishing or cutting off the public switched telephone network Electrical connection between the circuit and the dummy load; a third relay electrically connected to the user circuit interface circuit and Between the first relays for selectively establishing or cutting off the electrical connection between the user loop interface circuit and the first relay; and a controller for controlling the second relay when the re-dial signal is generated Establish the electrical connection between the public switched telephone network and the dummy load 'and control the third relay to cut off the electrical connection between the user circuit interface circuit and the first relay. 2 · As described in item 1 of the scope of patent application System, where when the redial Page 16 4. The system described in item 1 of the scope of patent application, which additionally contains ... Second, send 2 = circuit (off-h00k and ring detect clrcuit), /, is connected via the first relay to the phone and to the public switched telephone network to detect the hook status of the phone Can f-hook status) and detect incoming calls. ~ 5 · The system described in item 4 of the scope of patent application, further comprising: a dual tone frequency redial coupling circuit (DTMF) electrically connected to the public switched telephone Between the network and the user loop interface circuit, the redial signal is transmitted to the transceiver detection circuit, and the voltage between the transceiver detection circuit and the subscriber loop interface circuit is isolated. ° 6 · The system described in item 1 of the scope of patent application, wherein the specific telephone number is stored in the user loop interface circuit. Page 17 Price 2: 1: 丨 q sa ji! 16f " Amendment of this case No. 91119051 Amendment VI. Patent application scope I 7. The system described in item 1 of the patent application scope, wherein the first relay is a Mechanical relay. 8. The system according to item 1 of the scope of patent application, wherein the second relay and the third relay are photo relays. 9. A method of redialing a VoIP modem, the VoIP modem includes a relay for selectively electrically connecting a telephone to a public switched telephone network or to a subscriber loop in the VoIP modem Interface circuit, the method includes the following steps: a) controlling the relay to electromechanically connect the telephone to a subscriber loop interface circuit in the VoIP modem; b) the subscriber loop interface circuit receives a specific telephone number; c) Establish the electrical connection between the public switched telephone network and a dummy load; d) cut off the electrical connection between the subscriber loop interface circuit and the relay; e) generate a redial signal from the subscriber loop interface circuit and send the The signal is transmitted to the public switched telephone network; and f) controlling the relay to electrically connect the telephone to the public switched telephone network. 10. The method as described in item 9 of the scope of patent application, further comprising the following steps: g) cutting off the electrical connection between the public switched telephone network and the dummy load; h) establishing the user loop interface circuit and Electrical connection between the relays. Page 18 u