VOIP ONSITE PABX SYSTEM GIVES YOU FULL FLEXIBILITY OVER YOUR PBX SYSTEM, WITH NUMEROUS ADDITIONAL FEATURES AT NO EXTRA COST  SYSTEM FEATURES: CALL FEATURES: AUTHENTICATION, BLACKLISTS, CALL DETAIL RECORDS, CALL FORWARD ON BUSY\ NO ANSWER, CALL MONITORING, CALL PARKING, CALL QUEUING, CALL RECORDING, CALL RETRIEVAL, CALL ROUTING, CALL SNOOPING, CALL TRANSFER, CALL WAITING, CALLER ID, CALLER ID BLOCKING, CONFERENCE, DO NOT DISTURB, FAX TRANSMIT AND RECEIVE, FLEXIBLE EXTENSION LOGIC, INTERACTIVE DIRECTORY LIST