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 loses connection Supports T.38 Fax for creating Fax-over-IP Supports a wide range of caller ID formats Use with Grandstream?s UCM series of IP PBXs for Zero Configuration provisioning