The IP04 is a complete Asterisk Appliance with four FXO or FXS module. It is an embedded open source Linux system with built-in SIP/IAX2 proxy server and NAT functions. It provides a solid, uniform platform for traditional PSTN communica-tions as well as VoIP communications. Targeting for SOHO user and SMB market with an easy to use graphical interface, IP04 provides a cost-saving solution on their telecommunication data needs. With IP04, company with branch offices in different countries can be easily combined together to work like a virtual single office through internet.