Product Name: USB VoIP PhoneModel Number: BT6600Place of Origin: ChinaFeatures: 1) Network interface setup wizard for DHCP, PPPoE, or fixed IP network environment 2) Auto configuration support (plug-n-play operation - requires no user setup when network access is available) 3) Smart firmware management support (no need for manual firmware upgrade) 4) Compatibility in multi-vendor open architecture VoIP networks 5) Dynamic DNS (DDNS) support for the use of domain name instead of IP address 6) NTP and redundant DNS service support 7) NAT / firewall traversal support with border session controller or stun server