ADSL cloud is strictly for data traffic and youcan do what you intend
by using voip to a remote router using the hdsl as
bandwidth between your gateway and the remote gateway.
despite the fact that ADSL is on your ananlog termination, those ADSL module
are not capable of supporting voice as they have no DSP's and ADSL network is not setup for
voice capabilities anyway.
only voip is supported with ADSL providing the WAN link to the remote gateway.