Grandstream ANALOG TELEPHONE ADAPTER 1 FXS telephone port (RJ11); 1 FXO PSTN line port (RJ11); Power-outage life line support; Up to 2 SIP account profiles, SIP over TCP/TLS, SRTP; Dual 10/100 Mbps network ports (RJ45) with integrated high performance NAT router; Status LED for power, telephone, PSTN line, network, and message waiting indication; Advanced telephony features; Comprehensive voice codecs; Automated provisioning using HTTP/HTTPS/Telnet/TFTP; Symmetric and asymmetric voice codec/RTP in any call sessions; T.38 Fax; SIP o