Although I don't know the earlier Norstar systems, my initial thoughts would be to fit one ATA to a spare digital extension port and perhaps tee off to a few analogue phones unless you need the cordless phones to have their own extension number.
Thanks for the input scrambler. They presently have 6 M7310 sets. Would like to get rid of 3 of them and add 5 cordless, with their own extension number
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