There are lots of video intercom systems available that will work on 4 wires (and some on 2 wires, for that matter). It just depends on the quality of audio and video that you want to achieve (poor/good/excellent). I think what DAS meant is that for you to achieve repeatedly good/excellent results with their products, you need to use twisted pair (ie Cat 5 or 6). The twisted pairs provide a degree of shielding that blocks interference, which 4-core security cable can't provide.
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