IndexFeature Guide 379Trunk-to-Trunk Call Duration [473] 344Two-way Recording into the VPS 218UUCD —> Uniform Call Distribution (UCD) 46Unattended Conference 138Uniform Call Distribution (UCD) 46User Group [603] 349User Groups of a Paging Group [640] 352User Groups of a Pickup Group [650] 353User Manual References 2User-to-user Signalling Type 1 (UUS-1) 183VVerified Code [120] 333Verified Code COS Number [123] 334Verified Code Entry 111Verified Code Name [121] 333Verified Code Personal Identification Number (PIN) 111Verified Code Personal Identification Number (PIN) [122] 333VIP Call 51Virtual Private Network (VPN) 266VM Group Floating Extension Number [660] 353VM —> Voice Mail Features 205Voice Mail (VM) Group 205Voice Mail DPT (Digital) Integration 215Voice Mail DTMF Integration 208Voice Mail Features 4, 205Voice over Internet Protocol (VoIP) Network 277VoIP —> Voice over Internet Protocol (VoIP) Network 277VPN —> Virtual Private Network (VPN) 266VPS Data Control by the PBX 218WWalking COS 110Walking Extension 242Walking Station —> Walking Extension 242Whisper OHCA 101Wireless XDP Parallel Mode 227Wireless XDP Parallel Mode for Paired Telephone [515] 348Wrap-up 54XXDP —> EXtra Device Port (XDP) 282