Adapting an old built-in intercom system to repeat the front and back door bells in all 7 reooms.

Both of us are slightly hearing impaired. Can the six wire system above be dedicated/modified to just ringing the door bells in all 7 rooms which includes a speaker at the front door? All the wires are in the attic. We do not use the intercom, in fact we do not use the intercom system at all. All we want is to hear the door bells. We are both 85 and usually do not hear the bells. Thanks, Fred Goodrich

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