Older 3x8, 6x16 and 8x24 Norstars running DR1 and I think DR2 software will not support a 7324 or 7316 for programming or as a digital station. Something to keep in mind.
I keep a beater 7310 in my truck for programming, works on all Norstar and BCM systems - particularly for sites that are all 7208's (you can program on those - the show, next, back and heading keys are in different places - they're a pain though for reasons mentioned above), or if I can't find a desk with a suitable phone for me to use at a customer site and I gotta hide out in the janitor's closet or boiler room where the Norstar is located.