Telephone network access device

A telephone network access device comprising:

• an Rj-11 port coupled to a public switched telephone network (PSTN) network;
• a voice splitter coupled to the Rj-11 port;
• a subscriber line interface circuit (SLIC) chip coupled to a voice over Internet protocol (VOIP) network;
• a first relay coupled to the voice splitter;
• a second relay coupled to the first relay, the SLIC chip, and a telephone;
• a ring detection unit coupled between the first relay and the voice splitter, wherein the ring detection unit outputs a first switch signal in response to detecting a ring signal from a PSTN communication;
• and
• a central processing unit (CPU) coupled to the first relay, the second relay, the SLIC chip, and the ring detection unit, and receiving the first switch signal from the ring detection unit;
• wherein the second relay connects the telephone to the VOIP network in response to a power on event, the CPU controls the first relay and the second relay connecting the telephone to the PSTN network in response to the CPU receiving the first switch signal from the ring detection unit, and controls the second relay reconnecting the telephone to the VOIP network in response to an ending of the PSTN communication.