Before revision: The typical scenario where T.38 is used is - T .38 Fax relay - where a T.30 fax device sends a fax over PSTN to a T.38 Fax gateway which converts or encapsulates the T.30 protocol into T.38 data stream.
After revision: The typical scenario where T.38 is used isT .38 Fax relaywhere a T.30 fax device sends a fax over PSTN to a T.38 Fax gateway which converts or encapsulates the T.30 protocol into T.38 data stream.