i have not done it on these older SL2100 sets, but it seems you can set account codes for access at system level: http://www.necsl1100distributors.com/mm5/downloads/sl1100/manuals-ug/SL1100-Features-Specs.pdf
It depends on what model phones you are using, the DT430 and DT830 have a security button on the top left of the display. we have a number of free video guides for users of the DT400/800 range on the bottom left of this page: https://www.mftelecomservices.co.uk/telephone-system-support/nec/
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