This hard phone is another ATA (analog telephone adaptor). It enables you to connect your POTS (plain old telephone system) phones to the Internet. Think of it as a phone jack for VoIP. It has one ethernet port and one RJ11 phone jacks. Out of the box, it is configured for DHCP. This means that it gets its IP address from your DHCP server automatically.
NOTE: We have seen instances where installing the Adapta behind a firewall which blocks ICMP packets causes problems with registration. Try turning off any ICMP blocking on your firewall.