Includes 5V power adapter.

? Pixel-based display - 128 x 64 monochrome graphical liquid crystal display (LCD) ? Four illuminated call appearance line buttons with tricolor LEDs ? LED indicates line state - active, idle, on hold, unregistered ? Line LED configurable to 13 different states (on/off, color, flash) ? Dedicated illuminated on/off buttons for audio mute, headset, and speakerphone ? Voicemail message waiting indicator light ? Voicemail message retrieval button ? Dedicated hold button ? Settings button for access to feature, setup, and configuration menus ? Volume control rocking up/down button controls handset, headset, speaker, ringer ? Standard 12-button dialing pad ? High-quality handset (RJ-7 connector) and cradle ? Built-in high-quality microphone and full-duplex speakerphone ? Headset jack - 2.5-mm port ? LED test function ? Two Ethernet LAN ports with integrated Ethernet Switch - 100BASE-T, RJ-45 ? 802.3af compliant PoE ? SIP version 2 (RFC 3261, 3262, 3263, 3264) ? SIP proxy redundancy - dynamic via DNS SRV, A records ? Re-registration with primary SIP proxy server ? SIP support in NAT networks - NAT (including serial tunnel [STUN]) ? SIPFrag (RFC 3420) ? Secure (encrypted) calling via SRTP (RFC 3711) ? Codec name assignment ? Voice algorithms: G.711 (A-law and µ-law), G.726 (16/24/32/40 kbps), G.729 A, G.723.1 (6.3 kbps, 5.3 kbps) ? Dynamic payload support ? Adjustable audio frames per packet ? Dual-tone multifrequency (DTMF) - in-band and out-of-band (RFC 2833) (SIP INFO) ? Flexible dial plan support interdigit timers ? IP address/URI dialing support ? Call progress tone generation ? Jitter buffer - adaptive ? Frame loss concealment ? VAD - voice activity detection with silence suppression ? Attenuation/gain adjustments ? MWI - message waiting indicator tones ? VMWI - voicemail waiting indicator - via NOTIFY, SUBSCRIBE ? Caller ID support (name and number) ? Third-party call control (RFC 3725)