Yeastar S412 IP PBX 08FXS 8VOIP 8 channel. Hybrid VoIP system that is geared toward small businesses and is designed to deliver exceptional productivity and cost savings. The S412 is suitable for a team consisting of a maximum of 8 members, and can accomodate up to 8 concurrent calls. The S412 is a small standalone system that unlocks a wide range of beneficial communication features without extra licensing fees, including but not limited to, instant messaging, call conferencing, remote management, interactive voice response (IVR) and real time monitoring.