&lt;p&gt;&lt;span style=&quot;color: rgb(90, 90, 90); font-family: Roboto, sans-serif; font-size: 16px; text-align: justify;&quot;&gt;Yealink SIP-T23P features intuitive user interface and enhanced functionality which make it easy for people to interact and maximize productivity. Yealink HD technology enables rich, clear, life-like voice communications, outsourced management options, flexible deployment and third-party communications applications. As a cost effective IP solution, it helps users to streamline business processes, delivery a powerful, security and consistent communication experience for small and large offices environment.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span style=&quot;color: rgb(90, 90, 90); font-family: Roboto, sans-serif; font-size: 16px; text-align: justify;&quot;&gt;&lt;br&gt;&lt;/span&gt;&lt;/p&gt;&lt;ul style=&quot;margin-right: 0px; margin-bottom: 0px; margin-left: 0px; -webkit-padding-start: 25px; font-size: 16px; color: rgb(90, 90, 90); font-family: Roboto, sans-serif;&quot;&gt;&lt;li&gt;Yealink HD Voice&lt;/li&gt;&lt;li&gt;132x64-pixel graphical LCD&lt;/li&gt;&lt;li&gt;Two-port 10/100 Ethernet Switch&lt;/li&gt;&lt;li&gt;PoE support&lt;/li&gt;&lt;li&gt;Up to 3 SIP accounts&lt;/li&gt;&lt;li&gt;Supports Dual-color LEDs&lt;/li&gt;&lt;li&gt;Headset support&lt;/li&gt;&lt;li&gt;Wall mountable&lt;/li&gt;&lt;li&gt;IPv6 support&lt;/li&gt;&lt;li&gt;Paperless design&lt;/li&gt;&lt;li&gt;Simple, flexible and secure provisioning options&lt;hr id=&quot;[object Object]&quot;&gt;&lt;table border=&quot;0&quot; class=&quot;table-col&quot; style=&quot;background-color: rgb(255, 255, 255);&quot;&gt;&lt;tbody&gt;&lt;tr&gt;&lt;th&gt;Audio Features&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;HD voice: HD handset, HD speaker&lt;br&gt;Wideband codec: G.722&lt;br&gt;Narrowband codec: G.711(A/μ), G.723.1, G.729AB,G.726, iLBC&lt;br&gt;DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO&lt;br&gt;Full-duplex hands-free speakerphone with AEC&lt;br&gt;VAD, CNG, AEC, PLC, AJB, AGC&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Phone Features&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;3 SIP accounts&lt;br&gt;Call hold, mute, DND&lt;br&gt;One-touch speed dial, hotline&lt;br&gt;Call forward, call waiting, call transfer&lt;br&gt;Group listening, SMS&lt;br&gt;Redial, call return, auto answer&lt;br&gt;Local 3-way conferencing&lt;br&gt;Direct IP call without SIP proxy&lt;br&gt;Ring tone selection/import/delete&lt;br&gt;Set date time manually or automatically&lt;br&gt;Dial plan, off hook hot line&lt;br&gt;XML Browser, Action URL/URI&lt;br&gt;Integrated Screenshots&lt;br&gt;RTCP-XR&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Directory&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;Local phonebook up to 1000 entries&lt;br&gt;Black list&lt;br&gt;XML/LDAP remote phonebook&lt;br&gt;Intelligent search method&lt;br&gt;Phonebook search/import/export&lt;br&gt;Call history: dialed/received/missed/forwarded&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;IP-PBX Features&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;Busy Lamp Field (BLF)&lt;br&gt;Bridged Line Apperance(BLA)&lt;br&gt;Anonymous call, anonymous call rejection&lt;br&gt;Hot-desking, emergency call&lt;br&gt;Message Waiting Indicator (MWI)&lt;br&gt;Voice mail, call park, call pickup&lt;br&gt;Intercom, paging, music on hold&lt;br&gt;Call completion, call recording&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Display and Indicator&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;132x64-pixel graphical LCD with backlight&lt;br&gt;LED for call and message waiting indication&lt;br&gt;Dual-color (red or green) illuminated LEDs for line status information&lt;br&gt;Intuitive user interface with icons and soft keys&lt;br&gt;National language selection&lt;br&gt;Caller ID with name, number&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;&lt;table border=&quot;0&quot; class=&quot;table-col&quot; style=&quot;background-color: rgb(255, 255, 255);&quot;&gt;&lt;tbody&gt;&lt;tr&gt;&lt;th&gt;Feature keys&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;3 line keys with LED&lt;br&gt;5 features keys: message, headset, redial, tran,hands-free speakerphone&lt;br&gt;6 navigation keys&lt;br&gt;Volume control keysFeature keys&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Interface&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;2xRJ45 10/100M Ethernet ports&lt;br&gt;Power over Ethernet (IEEE 802.3af), class 2&lt;br&gt;1xRJ9 (4P4C) handset port&lt;br&gt;1xRJ9 (4P4C) headset port&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Management&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;Configuration: browser/phone/auto-provision&lt;br&gt;Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy&lt;br&gt;Auto-provision with PnP&lt;br&gt;Zero-sp-touch&lt;br&gt;Phone lock for personal privacy protection&lt;br&gt;Reset to factory, reboot&lt;br&gt;Package tracing export, system log&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Network and Security&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;SIP v1 (RFC2543), v2 (RFC3261)&lt;br&gt;NAT transverse: STUN mode&lt;br&gt;Proxy mode and peer-to-peer SIP link mode&lt;br&gt;IP assignment: static/DHCP&lt;br&gt;HTTP/HTTPS web server&lt;br&gt;Time and date synchronization using SNTP&lt;br&gt;UDP/TCP/DNS-SRV(RFC 3263)&lt;br&gt;QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP&lt;br&gt;SRTP for voice&lt;br&gt;Transport Layer Security (TLS)&lt;br&gt;HTTPS certificate manager&lt;br&gt;AES encryption for configuration file&lt;br&gt;Digest authentication using MD5/MD5-sess OpenVPN, IEEE802.1X IPv6&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;th&gt;Other Physical Features&lt;/th&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td&gt;&lt;p align=&quot;left&quot; style=&quot;margin-bottom: 10px;&quot;&gt;Wall mountable&lt;br&gt;External universal AC adapter (optional)：AC 100~240V input and DC 5V/600mA output&lt;br&gt;Power consumption (PSU): 0.72-1.56W&lt;br&gt;Power consumption (PoE): 0.96-1.98W&lt;br&gt;Dimension(W*D*H*T): 209mm*188mm*150mm*41mm&lt;br&gt;Operating humidity: 10~95%&lt;br&gt;Operating temperature: -10~50°C&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;&lt;br&gt;&lt;/p&gt;