This document discusses using a SIP-416 server to provide IP PBX and VoIP services. It can support up to 16 extensions and concurrent calls. The SIP-416 can be used alone as a SIP proxy server or combined with a PABX. It also supports SIP trunking and connections to smartphones via WiFi. Sample configurations include using the SIP-416 for voice with a separate router for data, connecting two SIP-416 servers via the internet, and supporting smartphone softphones over 3G or WiFi.