I'm going to let you in on a secret ... most of the T.38 Fax Over IP (FoIP) service you can buy today is fundamentally broken. As crazy as it sounds, it’s missing the one feature that makes sure the other side receives an exact copy of your image — a feature known as Error Correction Mode (ECM). Each day, millions of fax pages are sent via T.38 circuits that don’t have ECM enabled, and everyone just kind of hopes the fax pages make it to the other side intact. Sounds crazy? We agree!!