The audio over coax cameras can only be used with the latest generation of Hikvision DVR's that have an (S) after the model number eg. DS-7204HUHI-K1(S).
View compatible AoC DVR's
There will also be a firmware update available in early 2020 for the ids-7200 series of acusense DVR's that will enable audio over coax to be supported on this range.
View IDS Acusense DVR's