BT Revelation 1+3 Expansion Card The BT Revelation 1+3 Expansion card allows your CCU to expand to accept an extra external line and three terminals. The CCU can take two of these extension cards. £95.00
BT Revelation Voice Module The BT Revelation Voice Module allows callers to be greeted by messages and direct themselves to the appropriate area, such as entering an extension. £70.00
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