The Avaya IP Office 500 V2 Phone Control Unit is a VoIP system designed for business and industrial use. This model features SIP trunking, auto attendant, call distribution, music on hold, and voicemail capabilities. It is part of the Avaya IP Office series, known for its reliable and efficient phone switching systems and PBXs. Perfect for enhancing communication within an office environment, this unit offers a range of features to support businesses in their telecom needs.