|  Protocols/ Standards |  SIP RFC3261, TCP/ IP/ UDP, RTP/ RTCP, HTTP/ HTTPS, ARP/ RARP, ICMP, DNS (A record, SRV, NAPTR), DHCP, PPPoE, SSH, TFTP, NTP, STUN, SIMPLE, LLDP-MED, LDAP, TR-069, 802.1x, TLS, SRTP | 
  |  Network Interfaces |  Dual switched auto-sensing 10/100 Mbps Ethernet ports | 
  |  Graphic Display |  132 x 48 LCD display | 
  |  Feature Keys |  2 line keys with dual-color LED and 1 SIP account, 3 XML programmable context sensitive soft keys, 5  (navigation, menu) keys. 13 dedicated function keys for PAGE/ INTERCOM, PHONEBOOK, MESSAGE,  HOME, HOLD, RECORD, MUTE, HEADSET, TRANSFER, CONFERENCE, SEND and REDIAL,  SPEAKERPHONE, VOLUME | 
  |  Voice Codecs |  Support for G.711µ/a, G.723, G.726-32, G.729 A/B, iLBC (pending), Opus (pending), in-band and  out-of-band DTMF (In audio, RFC2833, SIP INFO) | 
  |  Headset Jack |  RJ9 headset jack (allowing EHS with Plantronics headsets) | 
  |  Telephony Features |  Hold, transfer, forward, 5-way conference, call park, call pickup, shared-call-appearance (SCA)/ bridged-line-appearance (BLA), downloadable phonebook (XML, LDAP, up to 2000 items), call waiting, call log (up to 500 records), customization of screen, off-hook auto dial, auto answer, click-to-dial, flexible dial plan,  hot desking, personalized music ringtones and music on hold, server redundancy and fail-over | 
  |  Base Stand |  Yes, 2 angled positions available, wall mountable | 
  |  Wall Mountable |  Yes | 
  |  QoS |  Layer 2 QoS (802.1Q, 802.1P) and Layer 3 (ToS, DiffServ, MPLS) QoS | 
  |  Security |  User and administrator level access control, MD5 and MD5-sess based authentication, 256-bit AES  encrypted configuration file, TLS, SRTP, HTTPS, 802.1x media access control | 
  |  Multi-language |  English, German, Italian, French, Spanish, Portuguese, Russian, Croatian, simplified and traditional  Chinese, Korean, Japanese and more | 
  |  Upgrade and Provisioning |  Firmware upgrade via TFTP / HTTP / HTTPS, mass provisioning using TR-069 or AES encrypted XML  configuration file | 
  |  Power and Green Energy Efficiency |  Input: 100-240V; Output: +12V, 1A;  Max power consumption: 6W | 
  |  Operating Temperature and Humidity |  0 ~ 40ºC (32 ~ 104ºF ), 10 ~ 90% (non-condensing) | 
  |  Compliance |  FCC: Part 15 (CFR 47) Class B  CE: EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, EN60950-1  RCM: AS/ACIF S004; AS/NZS CISPR22/24; AS/NZS 60950; AS/NZS 60950.1 | 
  |  Dimension |  209 x 184.5 x 76.2mm | 
  |  Weight |  0.74kg |