linksys pap2t: 1.FXS VoIP phone adapter. 2.1 RJ-45 port LAN Ethernet . 3.Fax,Inside Rooter/NAT, gateway Linksys pap2t: 1.FXS VoIP phone adapter. 2.1 RJ-45 port LAN Ethernet . 3.Fax,Inside Rooter/NAT, gateway Factory price original linksys PAP2t voip adapter with 2 FXS ports Product characteristic 1. Support SIP2.0 (RFC3261), TCP/UDP/IP, RTP/RTCP/, HTTP, ICMP ARP/RARP, DNS, DHCP, NTP, PPPoE, STUN, ...