AVS Special Member
Join Date: Sep 2000
Location: Los Angeles, CA
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First, the cable is probably not aluminum. It's most likely tinned copper.
If your new intercom is Ethernet based, then you will have to use CAT5 wire. If its analog, the old cable may work. In looking at the wiring sheet you posted,, it may be an analog system. But then the problem is going to be getting that 22awg wire in an RJ45 plug, in fact you can't. You would have to splice it to a CAT5 pigtail cable, rather sloppy IMO.
And also consider manufacture support and warranty. I would just use CAT5 and follow their instructions. Good painters and drywall contractors can do very good repair work. This is no different than a copper re-pipe or knob and tube writing upgrade job.