No Outgoing Faxes being sent for 3 days

We just realized that no faxes are being sent for the past three days. We are receiving faxes just fine and the notifcations for calls and texts are still coming through our main line. When I pulled the report of all outgoing faxes for the week, it shows the last fax sent was on Tuesday. We've sent dozens of faxes since then for which no confirmation was received nor do they appear on the log as outgoing. Can anyone help?