... VoIP applications, the IP PBX provide IP-based communications, voice conferencing, support paging /intercom, call monitoring and BLF ( ... call detailed record (CDR), centralized Auto-Attendant (AA),and Interactive Voice Responses (IVR). the ZX50 utilizes standard PSTN lines via ... service, telephone number portability and one network for both voice and data. functions Configuration by WebBuilt-in SIP/IAX ...