PLANET VIP-1680 This is a 16-Port VoIP Gateway (8*FXS + 8*FXO) - SIP/H323 Dual Protocol that has a dual standard (SIP and H.323) compliant residential that provide a total solution for integrating voice-data network and the public switched telephone Network (PSTN). This is equipped with a Ethernet switch and built-in NAT router function that provides Internet access using only one IP address making it ideal choice for P2P voice chat and ITSP cost-saving solution.