16 VoIP accounts Call hold, mute, DND One-touch speed dial, hotline Call forward, call waiting, call transfer Group listening, SMS, emergency call Redial, call return, auto answer 10-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) Dual USB ports (2.0 compliant): Bluetooth earphone through BT40/BT41 Contact synchronization through BT40/BT41 Wi-Fi through WF40/WF50 USB call recording through USB flash drive USB headset Expansion Module EXP43 Wireless Headset Adapter EHS40 Enhanced DSS key
