Can of worms unless you know what you're doing.
If you had a good replacement HD (same model), and your CF card was good (bootable) and also had the Unixware install files on, you could
deactivate hd
remove hdcf card
swap hd
insert card, wait for it to boot ADP from CF (as blank HD won't boot)
copy ddrsm from device 6 to 1, areas E (bootable DB), maybe F (regens), and I (unixware install files)
reload ADP again to load from hd
wait for it to install UW again as you've only copied the RMX DB which gives you telephony, but it needs to install the assistant.
Lots to go wrong there and it probably would.
If it's a simplex system you're looking at system downtime as ADP runs on the same processor as the SWU.
If you have PCHI tool AND the software, you can use it rebuild a blank HD over atlan as long as the ADP is running, so, again it needs to be running from CF card.