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 | Main CatalogCommunication systems for office and vehicles IP phone setsSIP-T21 phone set |  |
Yealink SIP-T21. 2 independent user accounts and LCD display
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Main specifications
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Review
Yealink’s new SIP-T21 takes entry-level IP phones to a level never achieved before. Making full-use of high-quality materials, plus an extra-large 132 x 64-pixel graphical LCD showing a clear 5-line data display, it offers a smoother user experience, much more visual information at a glance, plus HD Voice characteristics. The T21 supports two VoIP account, simple, flexible and secure installation options, plus support for IPv6, Open VPN and a redundancy server. It also operates with SRTP/ HTTPS/ TLS, 802.1x. As a very cost-effective and powerful IP solution, the T21 maximizing productivity in both small and large office environments.
Features
HD Voice: HD Codec, HD speaker, HD handset
132 x 64-pixel graphical LCD
2 VoIP accounts
Two-port 10/100 Ethernet Switch, integrated PoE
Headset, wall-mountable
XML/LDAP remote phonebook
Specification
Audio Features
> Full-duplex hands-free speakerphone with AEC
> Codecs: G.722 ( Wideband), G.711(A/μ), G.723, G.729AB, G.726
> DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO
> VAD, CNG, AEC, PLC, AJB, AGC
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
Phone Features
> 2 VoIP accounts
> Call hold, mute, DND
> One-touch speed dial, hotline
> Redial, call return, auto answer
> Call forward, call waiting, call transfer
> Group listening, SMS
> Local 3-way conferencing
> Direct IP call without SIP proxy
> Ring tone selection/import/delete
> Keypad lock, emergency call
> Set date time manually or automatically
> Dial plan, XML Browser, action URL&action URI
IP-PBX Features
> Anonymous call, anonymous call rejection
> Message waiting indicator (MWI)
> Voice mail, call park, call pickup
> Intercom, paging, music on hold
> Call completion, call recording, hot-desking
Display and Indicator
> 132x64-pixel graphical LCD
> LED for call and message waiting indication
> Intuitive user interface with icons and soft keys
> National language selection
> Caller ID with name, number
Network and Security
> SIP v1 (RFC2543), v2 (RFC3261)
> IPv6, open VPN
> NAT transverse: STUN mode
> Proxy mode and peer-to-peer SIP link mode
> IP assignment: static/DHCP/PPPoE
> 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
> IEEE802.1X
Management
> Configuration: browser/phone/auto-provision
> Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy
> Auto-provision with PnP
> Zero-sp-touch
> Provisioning server redundancy supported
> Reset to factory, reboot
> Package tracing export, system log
Physical Features
> 2xRJ45
> 31 keys including 4 soft keys
> 4 LEDs: 1xpower, 2xline, 1xmessage
> 1xRJ9 handset port
> 1xRJ9 headset port
> Wall-mountable
> Power adapter: AC 100~240V input and DC 5V/600mA Output
> Power over Ethernet (IEEE 802.3af)
> Power consumption: 1.4-2.6W
> Net weight: 0.81kg
> Dimension: 209mm*188mm*150mm*41mm
> Operating humidity: 10~95%
> Storage temperature: -10~50°C
Download
| File Title | Release Date | File Type | Size (mb) | Action |
|---|---|---|---|---|
| How to work with the remote phonebook XML | 02-22-2014 | Documentation (zip) | 0.06 MB |  download |
| How to Create ringtones for SIP-phone | 02-22-2014 | Documentation (pdf) | 2.30 MB | download |
| Software for Yealink SIP-T21/21P (version 34.71.14.5) | 02-22-2014 | Software (zip) | 7.30 MB | download |
| How to work with the server Autoprovision v71 for Yealink T2X, T3X, VP530 | 02-22-2014 | Documentation (zip) | 3.70 MB | download |
| User Guide Yealink SIP-T21 (P) | 02-22-2014 | Documentation (pdf) | 3.76 MB | download |
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