It you mean that the connection from the phone set to the control unit is a single pair, with a digital data stream carrying the audio and the light/button information together, no.
But as Dexman points out, the audio is carried on one analog pair, and the lights/buttons/display are carried digitally on another pair.
The ACS is not a digital system. It does not use digital phones. It uses hybrid Partner phones as described above. Performance is not a function of being digital (or not).
This architecture gives the customer the flexbility to have cordless phones, cc readers, and other analog devices work without adaptors or special programming. Over the years, I have not not heard anyone care if the ACS is digital unless raised by another vendor. It reminds me of the vendors who now say you need a shiny IP phone instead of one of those over-the-hill digital things.
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