The Multi-Vendor Development is a hardware bus for computer telephony integration (Audiotex) equipment, a PCM data highway for interconnecting expansion boards inside a PC. It was invented and brought to market by Natural Microsystems Inc (now NMS Communications).
Used to build call center equipment using regular PCs, MVIP provides a second communications bus within the computer that can multiplex up to 256 full-duplex voice channels from one voice card to another. Digital voice, fax and video is bussed over a ribbon cable connected at the top of each ISA or PCI card. MVIP products make a PC perform like a small-scale PBX. The protocol accommodated for a variety of expansion boards, including trunk interfaces (usually T1 or ISDN), voice processing boards equipment speech recognition or fax processing. Each board could optionally provide a switch that could interconnect voice channels on the bus, allowing for a flexible routing of calls within the MVIP bus.