Abstract: A module and method for automatically detecting and switching between FXO and FXS interfaces via a single RJ11 is disclosed. The module comprises a RJ11 jack, a USB controller, a modem element, a SLIC module and a DAA module, wherein the USB controller is electrically coupled with a computer for automatically detecting whether a PSTN phone line or a traditional telephone is plugged into the RJ11 jack. According to the detection, the telephone can be connected to the Internet for making and answering a VoIP call via the computer; the computer can be connected to the Internet for making and answering a VoIP call via the modem element; or the computer can make/answer a call to/from the PSTN.

Abstract: An apparatus and method for automatic call back are disclosed. When a first communication device requests connection via a first communication network with a higher calling rate, a second communication device of the present invention refuses the connection via the first communication network, but instead, requests communication with the first communication device via a second communication network with a lower calling rate.