Yealink SIP-T23P Enterprise HD IP Phone Yealink T23P

Audio Features
> HD voice: HD handset, HD speaker
> Wideband codec: 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
> 3 SIP accounts
> Call hold, mute, DND
> One-touch speed dial, hotline 
> Call forward, call waiting, call transfer
> Group listening, SMS
> 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, off hook hot line
> XML Browser, Action URL/URI
> Integrated Screenshots
> RTCP-XR


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, emergency call
> Message Waiting Indicator (MWI)
> Voice mail, call park, call pickup
> Intercom, paging, music on hold
> Call completion, call recording

Display and Indicator
> 132x64-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
> National language selection
> Caller ID with name, number

Feature keys
> 3 line keys with LED
> 5 features keys: message, headset, redial, tran,hands-free speakerphone
> 6 navigation keys
> Volume control keys

Interface
> 2xRJ45 10/100M Ethernet ports
>Power over Ethernet (IEEE 802.3af), class 2
> 1xRJ9 (4P4C) handset port
> 1xRJ9 (4P4C) headset port

Other Physical Features

> Wall mountable
> External universal AC adapter (optional):AC 100~240V input and DC 5V/600mA output
> Power consumption (PSU): 0.72-1.56W
> Power consumption (PoE): 0.96-1.98W
> Dimension(W*D*H*T):209mm*188mm*150mm*41mm
> 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)
> NAT transverse: 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