Technically I already have been manipulating the input and output gains for volume control, and I just notice a sharp disparity between the volume of Voxee and SipPhone/GizmoProject and the volume of the Voxee and FWD echo tests. i.e. holding volume (gain) constant, either normal calls will sound too quiet or the echo tests will sound too loud. However I do think there is a range of volume between each provider, since Voxee is the quietest, then Gizmo, then Voxalot and finally FWD is the loudest and most distorted when played at a gain appropriate for Voxee. Strange huh?
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