The document describes the features and capabilities of the SAPEX IP-PBX server. It is an all-in-one embedded IP-PBX platform that integrates registrar, proxy, presence and voice mail servers. It supports SIP protocol and allows registration of multiple SIP trunks. Key features include seamless connectivity for remote users, dynamic DNS, presence and instant messaging, call detail recording, RADIUS client for authentication and accounting, and various call management functions.