Technical specificationsPhysical characteristics• Diameter: 240 mm• Height: 77 mm• Weight: 1 kg (2.2 lb)• Color: Licorice (black)Display• LCD, 128x64 pixels (5 in. x 2.5 in.)Keypad• Keypad: Alphanumeric 0–9, *,on, off, mute, hold, volume up,volume down• Five buttons for menu navigation,contacts (line), and conferenceguideAudio characteristics• OmniSound®* 2.0 widebandtechnology• Microphone¬ Omnidirectional¬ Reception area: Up to 30 m2(320 ft2) for more than 10people in a room• Speakers¬ Frequency range: 200 Hz to7000 Hz¬ Volume: Max 90 db SPL 0.5 m¬ Equalizer: Soft, neutral, sharp• Codecs¬ G722, G711 (A-law and Mu-law),G729ab• DTMF¬ In Band, via RTP, SIP infoDirectory• Local Phone Book, up to 1000entries per profile• LDAP clientInteroperability• SIP 2.0, RFC 3261 and companionRFCsRecording• Support for SD memory cardsup to 2 GBPower• Power over Ethernet (IEEE 802.3af)Class 3• Transformer: 100 V AC to 240 V AC/13.5 V DCConnections• Ethernet: RJ-45• Expansion microphones (1 pair)Network and provisioning• DHCP and static IP• NTP and SNTP• Ethernet: 10/100Base-T• QoS support: IEEE 802.1p/Qtagging (VLAN), Layer 3 TOSand DSCP• Software upgrade: http/https• Web-based remote configuration• Web-based diagnostics• Provisionning: http/httpsSecurity• Authentication: Basic or digest• Transport: TLS and SRTP• Anti-theft protection: Kensington®security slotLanguages• Multi-language support (menu):Danish, Dutch, English, Finnish,French, German, Greek, Italian,Norvegian, Polish, Portuguese,Russian, Spanish, Swedish,TurkishSafety• EN 60950-1:2006• ANSI/UL 609501-2002• CAN/CSA-C22.2• No. 60950-1-03EMC• EN 301 489-3 V1.4.1 (2002-08)• EN 301 489-1 V1.6.1 (2005-09)• F CC Part 15 subpart B class A• F CC Part 15 subpart C• EN 300220-1:2000• EN 300220-2:2000Environmental conditions• Temperature:5 °C to 40°C (41°F to 104°F)• Relative humidity: 20% to 80%condensation free• Storage Temperature:-40°C to 70°C (-40°F to 158°F)Product ships with• OT4135 IP Conference Phone• 6.5m (21 ft) Network CableAccessories• 3GV28134AA Expansion microphones, 1 pair with cables1.5 m (5 ft) and 2.5 m (8 ft)• 3GV28133AA Transformer100–240 V AC/13.5 V DC with EU,UK, US & AUS plug and 7.5 m (25 ft)connection cable power