Patent ID: 8204183

Claim:
A method for enabling an Internet extension to ring a conventional extension, an enterprise telephone network comprising the Internet extension and the conventional extension, the method comprising the steps of: (a) receiving a calling request from the Internet extension, the calling request comprising a conventional extension number of the conventional extension; (b) assigning an IP address and a port to a real-time transport protocol (RTP) channel according to a correspondence relationship between the Internet extension number and the conventional extension number; (c) transmitting the IP address and port using an assignment signal so that the internet extension and the conventional extension can transmit voice packets to each other according to the assignment signal; (d) substituting an exchange number of the enterprise telephone network for the conventional extension number in the calling request; (e) transmitting the substituted calling request to a gateway having the exchange number according to the exchange number so that the gateway transmits a ring signal to a voice automatic machine via a telephone exchange in response to the substituted calling request; (f) receiving an acknowledge (ACK) signal from the gateway, the ACK signal representing a reply of the voice automatic machine to the ring signal; (g) transmitting the ACK signal to the Internet extension; (h) receiving a response signal from the Internet extension, the response signal is generated by the Internet extension in response to the ACK signal; and (i) transmitting the response signal to the gateway.