A network device (10) for retrieving voice over Internet protocol (VoIP) configuration parameters includes an automatic dialing module, an asymmetric digital subscriber line (ADSL) module, a connection determining module, a sending module, and a parsing module. The automatic dialing module provides automatic dialing connections. The ADSL module provides ADSL connections. The connection determining module determines whether an automatic dialing connection and an ADSL connection of the network device are normal. The sending module communicates with the connection determining module and a server for sending a data retrieval request to the server. The response determining module communicates with the server for determining whether a response received from the server is correct. The parsing module communicates with the response determining module and the server for receiving data sent by the server corresponding to the data retrieval request and parsing the data to determine VoIP configuration parameters.