NEC SL1100 Additional 1-Port Mobile Extension License (1100085)
Additional 1-Port Mobile Extension License. Allows a predetermined external telephone (typically a cell phone) to link to the SL1100 and operate as an internal single-line telephone. This license is required for each Mobile Extension after the first four (4), which are included on the CPU. Each Mobile Extension takes up an analog port in the system, although it does not require an analog station card.