Text String Notation for Dial Sequences and Global Switched Telephone Network (GSTN) / E.164 Addresses, September 2003
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This memo describes the full set of notations needed to represent a text string in a Dial Sequence. A Dial Sequence is normally composed of Dual Tone Multi Frequency (DTMF) elements, plus separators and additional "actions" (such as "wait for dialtone", "pause for N secs", etc.) which could be needed to successfully establish the connection with the target service: this includes the cases where subaddresses or DTMF menu navigation apply.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.