A Voice over Internet Protocol (VoIP) interface system for enabling communications between a plain old telephone service (POTS) device and a packet data network is disclosed. The VoIP interface system includes a POTS interface configured to communicate POTS voice telephone communications and a powered packet-based interface configured to communicate packet-based voice telephone communications with a host computer system that also provides power. The VoIP interface system also includes a memory system that includes a set of instructions, that direct the host system to prompt the user for a selection from a plurality of VoIP service providers, receive a selection identifying one of the plurality of VoIP service providers, identify profile information associated with the user and the selected one of the VoIP service providers, and populate one or more fields of a Session Initiation Protocol (SIP) module based on the profile information when executed.
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