Also known as demod/remod, fax relay is one of the implementation methods described by the ITU-T Recommendation T.38 specification for Fax over Internet Protocol (FoIP). Fax relay addresses the demodulation of standard analog fax transmissions from originating machines equipped with modems, and their remodulation for presentation to matching destination devices. Fax relay depends on a low latency IP network in order to avoid session time-out. See also facsimile, fax spoofing, FoIP, latency, modulation, and T.38.