Grandstream GXP2000 SIP VoIP Phone. The Grandstream GXP-2000 sip phone is a next generation enterprise IP telephone based on open industry standards. Built on innovative technologies, the GXP-2000 sip phone features market leading superb audio quality, rich functionalities, and excellent manageability at affordable prices. Main Features:

• Support SIP (RFC3261), TCP/IP/UDP, RTP/RTCP, HTTP, ARP, ICMP, DNS (A record and SRV), DHCP(both client and server), PPPoE, TFTP, NTP
• Support NAT traversal (STUN, etc), server fail-over, SIP presence (SIMPLE), and more
• Multiline support of up to 11 lines indicators (expandable to a few dozen more through expansion key-module)
• Graphical LCD to display up to 8 lines and 22 characters per line
• Dual 10/100Mbps Ethernet ports
• Headset jack
• Support Caller ID display or block, per call or permanent
• Call waiting, Hold, Mute, Transfer (blind or attended), Forward, and more
• Multi-party conferencing
• Integrated Power-over-Ether (802.3af)
• And many more enterprise grade features