I'm still totally confused. If you have Digital Voice phones you have no need of a Digital Voice adapter which you appear to have. The DV adapter is a device to enable analogue phones to connect to the hub at other locations than where the hub is sited.
Yes, I think Licquorice is right.
Part of the problem here is that we are confused about the type of phone you have. So, is it:
Or the base station plugged into an adapter.