Norstar is a digital system so I would not worry to much about how many phones.
There might be some some versions that have a maximum but the later versions I don't think so.
Either way 25 sets is way under any limit.
You should mention what system and software level you have when asking questions.
You should learn about Park and Page mode when you start to have that many lines
This will free up buttons for features.
Program a Park key programmed on sets (F74) and Page (F611)
Program Lines to Ring Only on sets - they come in on the Intercom key
Call taker press's Park
Display states slot the call is parked in "ie 101"
Call taker pages "Joe blow 101"
Joe Intercoms 101 from any phone to retrieve call.
or Transfer the call to the set as normal.
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