Audio Features

• HD voice: HD handset, HD speaker
• Wideband codec: Opus*, G.722
• Narrowband codec: Opus*, G.711(A/µ), G.723.1, G.729, G.729AB, G.726, iLBC
• DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO
• Full-duplex hands-free speakerphone with AEC
• VAD, CNG, AEC, PLC, AJB, AGC

Phone Features

• 6 VoIP accounts
• One-touch speed dial, redial
• Call forward, call waiting
• Call transfer, call hold
• Call return, group listening
• Mute, auto answer, DND
• 3-way conference call
• Direct IP call without SIP proxy
• Ring tone selection/import/delete
• Hotline, emergency call
• Set date time manually or automatically
• Dial plan, XML Browser, Action URL/URI
• Integrated Screenshots
• RTCP-XR
• USB port (2.0 compliant) Bluetooth earphone through BT40 (pending), Wi-Fi through WF40 (pending), USB call recording through USB flash drive (pending)
• Enhanced DSS key

Directory

• Local phonebook up to 1000 entries
• Black list
• XML/LDAP remote phonebook
• Intelligent search method
• Phonebook search/import/export
• Call history: dialed/received/missed/forwarded

IP-PBX Features

• Busy Lamp Field (BLF)
• Bridged Line Apperance (BLA)
• Anonymous call, anonymous call rejection
• Hot-desking, voice mail
• Flexible seating
• Call park, call pickup
• Executive and Assistant
• Centralised call recording
• Visual voice mail

Display and Indicator

• 3.66" 240x120-pixel graphical LCD with backlight
• LED for call and message waiting indication
• Dual-colour (red or green) illuminated LEDs for line status information
• Intuitive user interface with icons and soft keys
• Multilingual user interface
• Caller ID with name and number
• Power saving

Feature keys

• 8 line keys with LED
• 8 line keys can be programmed up to 21 paperless DSS keys (3-page view)
• 8 features keys: message, headset, conference, mute, hold, transfer, redial, hands-free speakerphone
• 4 context-sensitive “soft” keys
• 6 navigation keys
• 2 volume control keys
• Illuminated message key
• Illuminated headset key

Interface

• Dual-port Gigabit Ethernet
• Power over Ethernet (IEEE 802.3af), Class 2
  1 x USB port (2.0 compliant)
  1 x RJ9 (4P4C) handset port
  1 x RJ9 (4P4C) headset port
  1 x RJ12 (6P6C) EHS port
  1 x RJ12 (6P6C) EXT port: Supports up to 6 Expansion Modules

Other Physical Features

• Stand with 2 adjustable angles
• Wall mountable
• External Yealink AC adapter (optional): AC 100~240V input and DC 5V/1.2A output
• Power consumption (PSU): 1.44~3.47W
• Power consumption (PoE): 1.72~7.07W
• Dimension (W*D*H*T): 265mm x 210mm x 170.5mm x 53.5mm
• Operating humidity: 10-95%
• Operating temperature: -10~50°C

Management

• Configuration: browser/phone/auto-provision
• Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy
• Auto-provision with PnP
• Zero-sp-touch, TR-069
• Phone lock for personal privacy protection
• Reset to factory, reboot
• Package tracing export, system log

Network and Security

• SIP v1 (RFC2543), v2 (RFC3261)
• Call server redundancy supported
• NAT traversal: STUN mode
• Proxy mode and peer-to-peer SIP link mode
• IP assignment: static/DHCP
• HTTP/HTTPS web server
• Time and date synchronization using SNTP
• UDP/TCP/DNS-SRV(RFC 3263)
• QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP
• SRTP for voice
• Transport Layer Security (TLS)
• HTTPS certificate manager
• AES encryption for configuration file
• Digest authentication using MD5/MD5-sess
• OpenVPN, IEEE802.1X
• IPv6
• LLDP/CDP/DHCP VLAN
• ICE

Package Features

• Package content:
  - Yealink SIP-T27G IP phone
  - Handset with handset cord
  - Ethernet Cable (1.5m CAT5E UTP Cable)
  - Stand
  - Quick Start Guide
  - Power Adapter (Optional)
  - Wall Mount Bracket (Optional)
• Qty/CTN: 5 PCS
• N.W/CTN: 6.6 kg
• G.W/CTN: 7.4 kg
• Giftbox size: 295mm x 224mm x 115mm
• Carton Meas: 602mm x 308mm x 236mm