Customer has comcast phone service from Arris unit. We measured 47-48vdc and 38mA current coming from the modem. Current is high but never have had an issue yet. Customer complains of no speech, phone rings, nothing there. Then they call the customer back and can talk. Happens on an intermittent basis. Comcast replaced modem and some outside filters.

Considering Sandman loop current regulators at this point but not sure if that is going to solve the problem.