I just ordered 3 PSTN lines + DSL from the phone co. for a new business. The sales rep said the DSL would have to come into the building over one of the 3 PSTN lines or else I would have to pay for a 4th voice line if I needed it separate.
Obviously I don’t want to waste money on a 4th line. Can I plug the voice/DSL line into *? Will the DSL cause problems?