| Protocols/Standards | SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP, ARP/RARP, ICMP, DNS (A record and SRV), DHCP, PPPoE, TFTP, NTP, STUN, SIMPLE |
| Network Interfaces | Dual switched 10/100 Mbps with integrated PoE (Power over Ethernet - for GXP285 only) support |
| Graphic Display | 128 x 32 pixel graphic LCD |
| Feature Keys | 3 dynamic context sensitive soft keys, 3 navigation/menu/volume keys, 7 dedicated function keys for: HOLD, SPEAKERPHONE, SEND, TRANSFER, CONFERENCE, FLASH and HEADSET |
| Voice Codec | Support for G.723.1, G.729 A/B, G.711 u/a-law, G.726, G.722 (wide-band), GSM and iLBC, in- band and out-of-band DTMF (in audio, RFC2833, SIP INFO) |
| Telephony Features | Hold, Mute, Transfer, Forward, 3-way Conference, Downloadable Phone Book (XML, LDAP up to 200 items), Call Waiting, Call Log, Off-hook Auto Dial, Auto Answer, Click-To-Dial, Downloadable Ringtones, Server Redundancy and Fail-over Support |
| Headset Jack | 2.5mm and RJ9 headset jack |
| QoS | Layer 2 (802.1Q, 801.2p) and Layer 3 (ToS, DiffServ, MPLS) QoS |
| Security | User and administrator level passwords, MD5 and MD5- sess based authentication, AES based secure configuration file, SRTP |
| Multi-language | English, Spanish, French, German, etc |
| Upgrade/Provisioning | Firmware upgrade via TFTP/HTTP, mass deployment using central secure provisioning file |
| PoE (Power over Ethernet) | Integrated (IEEE 802.3af) |
| Power | Universal power adaptor (Input: 100-240VAC 50-60Hz, Output:+5VDC, 1.2A, UL Certified) included |
| Physical | Dimension: 168mmx200mmx89.5mm
Unit weight: 0.62KG
Package weight: 0.725KG |
| Temperature/Humidity | 32-104°F/ 0-40 °C, 10-90% (non-condensing) |
| Compliance | FCC,CE,C-Tick |