The T57W allows the management of 16 SIP accounts, it has Wifi and Bluetooth connectivity as well as DECT technology to pair up to 4 wireless handsets.

You also have the option of adding a total of 3 Yealink EXP50 expansion modules to speed up your use and access more shortcuts.
This IP phone is designed for intensive use in the business environment. The latest version of Yealink Optimal HD voice technologies effectively eliminates unwanted noises while providing crystal-clear voice with high-definition sound.

• 7-inch capacitive color touchscreen
• Ergonomic: adjust the screen tilt
• Bluetooth 4.2
• Wifi
• Headset connection via USB, Bluetooth, or RJ9
• Management of 16 SIP accounts
• HD audio
• Integrated USB 2.0 for recording, connecting wired or wireless USB headsets, or up to 3 EXP50 expansion modules.
• Power over Ethernet (PoE), power supply not included
• Wall mount
• Dual Gigabit Ethernet port
• Handset compatible with hearing aids (HAC)
• DECT function: pair up to 4 handsets
• Content sharing via Yealink VC Desktop