This is what I have researched so far:
In addition, DSL uses different wires than the ones the phone uses. The phone line uses wires in the middle of the cable, and DSL uses ones on the outside. I know it is possible to have phone service by one provider and DSL by another if there isn't a monopoly in the given area. This would indicate that the phone service could be off, but DSL on. The physical lines would have to stay in place: without them there cannot be a DSL connection.
I rarely use FAX but
Internet fax services have several benefits in addition to not requiring a phone line. You can send or receive faxes anywhere where there's Internet access. You also have an always-on fax that never runs out of paper or ink.
Most allow you to send a fax via e-mail to a fax machine. You type the recipient's fax number in the To: field, followed by the service's domain name. The body of the message is sent as a cover page. Attached files are sent as the fax documents.
In addition, DSL uses different wires than the ones the phone uses. The phone line uses wires in the middle of the cable, and DSL uses ones on the outside. I know it is possible to have phone service by one provider and DSL by another if there isn't a monopoly in the given area. This would indicate that the phone service could be off, but DSL on. The physical lines would have to stay in place: without them there cannot be a DSL connection.
I rarely use FAX but
Internet fax services have several benefits in addition to not requiring a phone line. You can send or receive faxes anywhere where there's Internet access. You also have an always-on fax that never runs out of paper or ink.
Most allow you to send a fax via e-mail to a fax machine. You type the recipient's fax number in the To: field, followed by the service's domain name. The body of the message is sent as a cover page. Attached files are sent as the fax documents.