Patent ID: 7123606
Filing Date: 2006-10-17
Classification: H04L,H04M

Abstract:
1. A voice over internet protocol device for auto-selectively dialing up a public switched telephone network or an internet phone, said voice over internet protocol device comprising: at least one line transfer switch, which connects with a terminal apparatus to receive a voice signal produced by said terminal apparatus; a control circuit, which is used to control each component in the entire device, and proceeds with packet processing for the signal received to produce a corresponding internet protocol packet; wherein at least one subscriber line interface circuit is connected to said at least one line transfer switch and to said control circuit to transform the voice signal transmitted from said terminal apparatus to a digital signal and then to transmit the digital signal to the control circuit to proceed with packet processing in order to carry out an internet telephone call by transmitting the internet protocol packet via the internet to the internet phone, wherein, in case a power supply failure is detected, the control circuit is connected to the line transfer switch to produce a trigger signal that causes the at least one line transfer switch to transfer a voice signal produced by said terminal apparatus from said at least one subscriber line interface circuit to said public switched telephone network, to thereby carry out voice communications over the public switched telephone network until power is restored; a rectifier, which connects with said control circuit to supply said control circuit with power required for its normal operation; at least one phone detection circuit, which is connected with said at least one line transfer switch and said control circuit to detect an employment status of said terminal apparatus; a ringing detection circuit, which is connected with said at least one line transfer switch and a loop to detect an in-coming call ringing signal transmitted from the public switched telephone network through said loop, wherein when said in-coming call ringing signal is detected, according to the employment status of said terminal apparatus detected by said at least one phone detection circuit, said control circuit supplies an in-coming call transfer signal to cause said at least one line transfer switch to connect said terminal apparatus with said loop to receive said ringing signal when the employment status of said terminal apparatus is that the terminal apparatus is unused, and when said terminal apparatus is picked up, to enable communication with a remote terminal apparatus to proceed through said public switched telephone network.