TWI412248B - Router and method for controlling connection of a telephone conversation by the same - Google Patents

Abstract

A router includes FXS port, FXO port, relay electronically connects between the FXS port and the FXO port, detecting circuit and controlling circuit. The FXS port connects to phone, the FXO port connects to PSTN. When the router is powered off, the detecting circuit is used to detect if the FXS port and the phone are connected to each other. The controlling circuit controls the on or off of the relay by the detecting result of the detecting circuit and the power state of the router. The present invention further provides a method for controlling connection of a telephone conversation by the router.

Description

Router and method for controlling call connection

The present invention relates to a router, and more particularly to a method for a router to control a call connection.

With the development and popularity of the Internet, Voice over Internet Protocol (VOIP) technology is widely used. VOIP is a technology service that delivers voice over IP networks. Users can make calls over the Internet using VOIP devices.

The conventional VOIP device includes at least a router and a telephone, and the router includes a relay, an external e-change subscriber (Foreign eXchange Subscriber or Foreign eXchange Station, FXS) interface, and a Foreign eXchange Office (FXO) interface respectively connected to the relay. . The telephone is connected to the FXS interface and dials a VOIP call by the FXS; the FXO interface is connected to a Public Switched Telephone Network (PSTN). When the router is powered off, the relay can automatically switch to interconnect the FXS interface with the FXO interface, and the phone can dial the PSTN phone through the FXO interface.

However, when the Internet re-establishes the connection or the router is powered back on, the route The system power supply provides a power supply of approximately 3.3V to the relay. At this time, the relay automatically disconnects the FXS interface from the FXO interface. If the user is dialing the PSTN phone through the FXO interface, This will automatically interrupt the user's call.

The router in the embodiment of the present invention includes an external switching user interface, an external switching station interface, and a relay, a detecting circuit and a control circuit electrically connected between the external switching user interface and the external switching station interface, and the external switching The user interface is coupled to the telephone, the external switching interface being connected to the public switched telephone network, and wherein the detecting circuit is configured to detect whether the external switched user interface is in communication with the telephone when the router is powered off ( a control state, wherein the control circuit is configured to control a switch state of the relay according to a detection result of the detection circuit and an electrical state of the router; if the external exchange user interface is between the user and the phone In the on state, the control circuit maintains the relay in a closed state, i.e., maintains the external switching user interface in a connected state with the external switching station interface.

The method for controlling a call connection by the router in the embodiment of the present invention includes the following steps: the router is powered off; the detecting circuit detects whether the external switched user interface and the telephone are in a connected (in-call) state; The control circuit controls the relay to remain in a closed state when the external exchange user interface is in an on state between the telephone and the telephone, i.e., to maintain the external exchange user interface in a connected state with the external exchange interface.

Compared with the prior art, the router of the present invention detects whether the telephone and the FXS interface are in an on state by setting a detection circuit, wherein the control circuit The detection result of the detecting circuit and the power-on state of the router to control the relay, that is, when the FXS interface is in an on state, the relay is activated regardless of whether the router is powered on again The closed state is maintained to maintain the connection between the FXS interface and the FXO interface, thus ensuring that the telephone is not interrupted by the PSTN call being re-powered by the router.

10‧‧‧ router

11‧‧‧FXS interface

12‧‧‧FXO interface

13‧‧‧ Relay

14‧‧‧Detection circuit

15‧‧‧Control circuit

16‧‧‧ indicator

20‧‧‧ telephone

30‧‧‧PSTN

1 is a functional block diagram of a router connected to a telephone and a PSTN according to a preferred embodiment of the present invention; and FIG. 2 is a flow chart of the operation of the router shown in FIG. 1.

Referring to FIG. 1 , a router 10 according to a preferred embodiment of the present invention includes an FXS interface 11 , an FXO interface 12 , a relay 13 electrically connected between the FXS interface 11 and the FXO interface 12 , a detection circuit 14 , and a control circuit 15 . Indicator 16.

The FXS interface 11 is connected to the telephone 20, and the FXO interface 12 is connected to the PSTN 30. When the relay 13 is closed, a connection is established between the FXS interface 11 and the FXO interface 12, so that the user can make a PSTN call by the telephone 20.

The detecting circuit 14 is electrically connected between the FXS interface 11 and the relay 13 for detecting whether the FXS interface 11 and the telephone 20 are in an on state. In the preferred embodiment, the detecting circuit 14 determines whether the FXS interface 11 and the telephone 20 are connected by detecting whether there is current flowing between the FXS interface 11 and the relay 13. (in progress) status.

The control circuit 15 is electrically connected between the relay 13 and the detection circuit 14 And the control circuit 15 is electrically connected to the power switch (not shown) of the router 10, and is configured to control the detection according to the detection result of the detection circuit 1'4 and the power state of the router 10. The switching state of the relay 13. When the user dials the PSTN call, that is, when the FXS interface 11 is connected to the telephone 20, the control circuit 15 keeps the relay 13 closed regardless of whether the router 10 is powered on, so that the telephone 20 is enabled. The FXS interface 11 and the FXO interface 12 remain in an on state; when the telephone 20 and the FXS interface 11 are hung up and the router 10 is powered on, the control circuit 15 causes the relay 13 is disconnected to disconnect the FXS interface 11 from the FXO interface 12, at which time the user can make a VOIP call by the telephone 20.

The indicator 16 is electrically connected between the relay 13 and the FXS interface 11 for indicating the connection state between the telephone 20 and the FXS interface 11. The indicator 16 illuminates when the telephone 20 is switched between the FXS interface 11 and the FXS interface 11, and the indicator 16 is extinguished when the telephone 20 is hung up from the FXS interface 11.

Referring to FIG. 2, when the router 10 controls the call connection, the method mainly includes the following steps:

Step S1: The router 10 is powered off. At this time, the relay 13 is closed, so that the FXS interface 11 is connected to the FXO interface 12, and the user can use the telephone 20 to make a PSTN call through the FXO interface.

Step S2: The detecting circuit 14 determines whether the FXS interface 11 and the telephone 20 are in an on state. If yes, go to steps S3 and S5, if not, then enter Proceed to step S4.

Step S3: The indicator 16 is illuminated.

Step S4: The indicator 16 is turned off.

Step S5: The control circuit 15 detects whether the router 10 is powered on again. If yes, go to step S6, if not, go to step S7.

Step S6: The relay 13 continues to remain closed, and remains in an on state with the telephone 20, the FXS interface 11 and the FXO interface 12.

Step S7: The detecting circuit 14 determines whether the FXS interface 11 and the telephone 20 are in a hanging state. If yes, go to S8, if not, go back to S5.

Step S8: The relay 13 disconnects the connection between the FXS interface 11 and the FXO interface 12, at which time the router 10 resumes the initial setting.

The router 10 of the present invention detects whether the telephone 20 and the FXS interface 11 are in an on state by setting the detection circuit 14, and the control circuit 15 detects the result by the detection circuit 14 and the router 10 The power-on state controls the relay 13, that is, when the FXS interface 11 and the telephone 20 are in an on state, the relay 13 remains closed regardless of whether the router 10 is powered back on, to maintain The connection between the FXS interface 11 and the FXO interface 12 ensures that the telephone 20 is not interrupted when the PSTN call is made because the router 10 is powered back on.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and those skilled in the art will be included in the equivalent modifications or changes in the spirit of the invention. Within the scope of the patent application.

10‧‧‧ router

11‧‧‧FXS interface

12‧‧‧FXO interface

13‧‧‧ Relay

14‧‧‧Detection circuit

15‧‧‧Control circuit

16‧‧‧ indicator

20‧‧‧ telephone

30‧‧‧PSTN

Claims (9)

A router comprising an external switching user interface, an external switching interface, and a relay electrically connected between the external switching user interface and the external switching interface, the external switching user interface being connected to the telephone The external switching station interface is connected to the public switched telephone network, wherein the router further comprises: detecting circuitry, configured to detect whether the external switched user interface and the telephone are in an on state when the router is powered off; And a control circuit, configured to control a switch state of the relay according to a detection result of the detection circuit and an electrical state of the router; wherein, when the router is powered on again, if the external exchange user interface is The telephone is in an on state, and the control circuit maintains the relay in a closed state to maintain the external exchange user interface in a connected state with the external exchange interface. The router of claim 1, wherein the control circuit disconnects the relay if the external exchange user interface is in a hung up state with the telephone and the router is powered back on The connection between the external exchange user interface and the external exchange station interface. The router of claim 1, wherein the detecting circuit determines between the external switching user interface and the telephone by detecting whether a current flows between the external switching user interface and the relay Whether it is on. The router of claim 1 or 2, wherein the router further includes an indicator for indicating that the telephone is inter-exchanged with the external user. The connection state between the faces. The router of claim 4, wherein the indicator is illuminated when the telephone is connected to the external exchange user interface; and when the telephone is connected to the external exchange user interface When off, the indicator is off. A method for controlling a call connection by a router according to claim 1, wherein the method includes the following steps: the router is powered off; and the detecting circuit detects whether the external switched user interface is connected to the telephone a state; when the external exchange user interface is in an on state with the telephone and the router is powered back on, the control circuit controls the relay to remain closed to maintain the external exchange user interface and the The external exchange interface is connected. The method of controlling a call connection by a router according to claim 6, wherein the control circuit detects whether the router is powered on again, when the external exchange user interface and the telephone are in a hung state, and The router is powered back on, and the control circuit controls the relay to disconnect the external switching user interface from the external switching interface. A method of controlling a call connection by a router according to claim 6 or 7, wherein the indicator is illuminated when the external exchange user interface is in an on state between the telephone and the telephone. The method of controlling a call connection by a router according to claim 6 or 7, wherein the indicator is turned off when the external exchange user interface is in a hanging state with the telephone.