12 VoIP accounts Call hold, mute, DND Redial, call return, auto answer One-touch speed dial, call forward, call waiting, call transfer Group listening, SMS, emergency call 3-way conferencing Direct IP call without SIP proxy Ring tone selection/import/delete Set date time manually or automatically Dial plan, XML Browser, Action URL/URI RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035) USB port (2.0 compliant) for: Wired/wireless USB headset USB call recording through USB flash drive Bluetooth headset through BT40 Bluetooth call through BT40 Mobile contacts synchronisation through BT40 Wi-Fi through WF40/WF50 Expansion module EXP50 (up to 3) Content Sharing (via Yealink VCD) Enhanced DSS key
