The EnGenius DuraFon PRO-BU is the expansion base that enables connection of an additional four (4) lines/ports to an existing DuraFon PRO installation. Also use the DuraFon PRO-BU for "Extended Range" options that are available with the DuraFon PRO product line. Multi-Line Functionality Supports up to 90 DuraFon PRO or DuraWalkie Handsets Works Behind any Analog Port (PBX, VoIP, PSTN, FXS or POTS) Expandable for Extended User Capacity
DuraFon PRO Expansion Base
