Grandstream HT814 AES 4-FXS Office HD NAT Router 2-SIP Voip GatewayGrandstream IP Telephone Adaptor 4 FXS ports w router Supports 2 SIP profiles through 4 FXS ports and dual Gigabit ports Includes a built in NAT router which can handle routing speeds up to 100MBps TLS and SRTP security encryption technology to protect calls and accounts Automated provisioning options include TR 069 and XML config files Supports 3 way voice conferencing Failover SIP server automatically switches to secondary server if main server