Yes,
isdn (BRI)basic rate interface has some terminals (TE), like isdn phones, fax G4, isdn 64k PC board for data, videoconference, etc.
So "any" isdn phone will do, to tests your dsl.
If the wiring is correct and the equipments are with power,
Layer1 (L1-physical) should be UP, layer2(L2- data...