Yealink SIP-T21P Entry Level PoE IP Phone w/2 Port Switch

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 10/100M Ethernet ports
>  31 keys including 4 soft keys
>  4 LEDs: 1xpower, 2xline, 1xmessage
>  1xRJ9 handset port
>  1xRJ9 headset port
>  Wall-mountable
>  Power adapter (optional):

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

Package Features
>  Qty/CTN: 10 PCS
>  N.W/CTN: 10.8KG
>  G.W/CTN: 12.3KG
>  Giftbox size: 215mm*200mm*118mm
>  Carton Meas: 615mm*436mm*208mm