GrandStream GS-UCM6102 UCM6102 innovative IP PBX appliance Supports up to 500 SIP endpoint registrations, up to 60 concurrent calls and up to 32 conference attendees 1GHz ARM Cortex A8 processor and 512 MB DDR Ram, 4GB NAND Flash Integrated 2/4/8/16 PSTN trunk FXO ports, 2 analog telephone FXS ports with lifeline capability and up to 50 SIP trunk accounts UCM6102 includes an integrated NAT router and built-in firewall. Gigabit network ports with Integrates PoE, USB, SD card Comprehensive security protection using SRTP, TLS and HTTPS with hardware encryption accelerator, Fail2ban, Whitelist, Blacklist, alerts and more to protect against attacks