•Easy Customization and High Expansibility •HD Audio •Wireless Transmission •Efficient Installation and Provisioning •Secure Transport and Interoperability

• No Perception Upgrade • Sync Level1 Base Backup • Headsets Registration • Security & Stability • Advanced DECT Contacts • Efficient Provisioning & Unified Management • Easy Setup and Deployment • Compatible with Multiple Devices

• 2.8” 320x240-pixel color LCD with backlight • Dual USB ports • Dual firmware images • Built-in Bluetooth 4.2 • Built-in dual band 2.4G/5G Wi-Fi (802.11a/b/g/ n/ac) • T4U Auto-P template unified • T4U firmware unified • Up to 12 SIP accounts • PoE support • USB headset and EHS support • Supports color-screen expansion modules • Stand with 2 adjustable angles • Wall mountable • Handset with hall switch

• Seamless handover and roaming •Up to 100 parallel calls •Up to 30 base stations •Up to 100 handsets • Up to 100 SIP accounts • Support XML/LDAP/Remote Phonebook • Support Xsi Directory • DECT radio coverage up to 50 m indoors and 300 m outdoors • Support IPv6 • Support PoE • DECT Technology: Yealink DECT technology focuses on high-quality Audio VoIP (wideband) and low-bit-rate data applications. However, we are incompatible with third-party DECT devices (base station, handset, etc.). • Compatible with Yealink W56H/W53H (version x.85.0.45 or later), W73H (version 116.85.0.25 or later), W78H (version 16.85.0.5 or later), CP930W (version 87.85.0.45 or later), W59R (version 115.85.0.45 or later), W57R (version 118.85.0.5 or later), CP935W (version 149.86.0.10 or later), T54W+DD10K (version 96.85.0.95 or later) and DD Phone (version 66.84.0.115 or later)