| Display | 132×48 pixel LCD with backlight |
| Ethernet Ports | Dual switched 10/100 Mbps Ethernet ports |
| Protocol Support | SIP, TCP/UDP/IP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP-MED, LDAP, TR-069, 802.1x, TLS, SRTP |
| Audio Codecs | G.711µ/a, G.722, G.723.1, G.726-32, G.729 A/B, iLBC |
| Speakerphone | Full-duplex speakerphone with AEC (Acoustic Echo Cancellation) |
| Headset Jack | RJ9 headset jack (compatible with Plantronics headsets) |
| Bluetooth Support | No |
| PoE | IEEE 802.3af Power over Ethernet (PoE) |
| Power Supply | Input: 100-240VAC, 50-60Hz; Output: 5VDC, 1A; PoE: IEEE 802.3af |
| QoS | Layer 2 QoS (802.1Q, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS) |
| Call Features | Caller ID, call waiting, call transfer, call forward, call hold, 3-way conference, XML browser, hot desking, personalized music ringtone, server redundancy and fail-over |
| Network Features | NAT traversal, static IP, DHCP client/server/relay, DNS, DDNS, VLAN, VPN (L2TP/IPSec/OpenVPN), HTTPS, SRTP, TLS, LDAP, TR-069 |
| Dimensions | 209mm (L) x 184mm (W) x 76mm (H) |
| Weight | 0.95 kg |
| Provisioning | HTTP/HTTPS/TFTP/FTP, Auto-provisioning with FTP/TFTP/HTTP/HTTPS and PnP |
| Security | User and administrator level passwords, MD5 and MD5-sess based authentication, AES based secure configuration file, SRTP, TLS, HTTPS |
| Warranty | 1 year |
| Package Contents | GXP1628 phone, handset with cord, base stand, universal power supply, network cable, quick installation guide, GPL license |
| LCD Display Languages | English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, Chinese, Korean, Japanese |
| Environmental | Operating temperature: 0°C to 40°C; Storage temperature: -10°C to 60°C; Humidity: 10% to 90% Non-condensing |
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