ESI 5000-0461 Communications Server CS IVC 12R12EL (Refurbished)Key Features: CS IVC (Intelligent VoIP Card) Supports standards compliant IP telephony service and features, including VoIP to the desktop and ESI Link It features highly configurable DSP technology that manages the flow of traffic among the port cards and converts IP packets into PCM (pulse code modulation) traffic for transmission over the PSTN The physical connection is a 10 100Base T, RJ 45 Ethernet interface that allows the system to connect to