The SMCPBX10 is a feature rich SIP based IP PBX telephony system that integrates traditional PBX services and VoIP technology into one easily managed device. Designed for the small business the SMCPBX10 is easy to install and manage. It can support up to 30 user accounts managed by a flexible call routing plan and SIP trunks for connecting multiple units to increase the number of extensions, link remote offices for free site-to-site calling, or connect with an ITSP for low cost calling.