Điện thoại IP Yealink SIP-T21 E2

Audio Features

• HD voice: HD handset, HD speaker
• Wideband codec: AMR-WB (optional), Opus, G.722
• Narrowband codec: G.711(A/µ), 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

• 2 VoIP accounts
• Call hold, mute, DND
• One-touch speed dial, hotline
• Call forward, call waiting, call transfer
• Group listening, SMS, emergency call
• Redial, call return, auto answer
• Local 3-way conferencing
• Direct IP call without SIP proxy
• Ring tone selection/import/delete
• Set date time manually or automatically
• Dial plan
• XML Browser, action URL/URI
• Integrated screenshots
• RTCP-XR, VQ-RTCPXR
• Enhanced DSS Key

Directory

• Loal phonebook up to 1000 entries
• Black list
• XML/LDAP remote phonebook
• Smart dialing
• 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
• Centralized call recording
• Visual voice mail
• Call recording

Display and Indicator

• 132 x 64-pixel graphical LCD with backlight
• LED for call and message waiting indication
• Dual-color (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

• 2 line keys with LED
• 6 features keys: message, headset, redial, transfer, mute, hands-free speakerphone
• 6 navigation keys
• Volume control keys Interface
• 2 x RJ45 10/100M Ethernet ports
• Power over Ethernet (IEEE 802.3af), class 2 (T21P E2)
• 1 x RJ9 (4P4C) handset port
• 1 x RJ9 (4P4C) headset port

Other Physical Features

• Color: Black
• Wall mountable
• External Yealink AC adapter：AC 100~240V input and DC 5V/600mA output
• Power consumption (PSU): 0.8-1.4W
• Power consumption (PoE): 1.3-1.8W (T21P E2)
• Dimension (W*D*H*T): 209 mm*188 mm*150 mm*41 mm
• Operating humidity: 10~95%
• Operating temperature: -10~50°C (+14~122°F)

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
• OpenVPN, IEEE802.1X
• IPv6
• LLDP/CDP/DHCP VLAN
• ICE

Package Features

• Package content:
  – Yealink SIP-T21(P) E2 IP phone
  – Handset with handset cord
  – Ethernet Cable (1.5m CAT5E UTP Cable)
  – Stand
  – Quick Start Guide
  – Power Adapter: T21 E2 (Standard)/T21P E2 (Optional)
• Qty/CTN: 10 PCS
• N.W/CTN: 11.7 kg
• G.W/CTN: 12.5 kg
• Giftbox size: 215 mm*200 mm*118 mm
• Carton Meas: 615 mm*436 mm*208 mm