Method and device for transmitting voice signal based on interconnected network and mobile communication network

This invention relates to a method and a device for transmitting voice signals based on Internet and mobile communication network, in which, said device includes a VOIP gateway, a radio T-R process unit, an instruction interface realizing mutual communication between said unit and the central process unit of the VOIP network and a coding-decoding unit realizing voice modulus conversion, said method includes: said VOIP gateway receives or transmits VOIP signaling information at the side of the internet, said radio T-R process unit sends or receives radio calling signaling at the side of the mobile communication network, setting end-to-end call to carry out voice transmission.