DVX-2002F - Asterisk based IPPBX, up to 30 user support, (10 concurrent calls)  build-in 2 FXO ports

DVX-2005F - Asterisk based IPPBX, up to 100 user support, (20 concurrent calls)  build-in 4 FXO ports expandable up to 8 FXO ports using DVX-2020 module

DVX-8000/M/E - Asterisk based IPPBX with build-in Expansion Module (8010), 300 user support (60 concurrent calls), 250GB HDD, 4 expansion  slots for Analog/PRI interface