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draft-allocchio-gstn-03.txt Implementation of "pause" and "tonewait": one instance of a "pause" SHOULD be interpreted as a pause of one second between the preceding and succeeding dial string element; a "tonewait" SHOULD be interpreted as a pause that will last until the calling party hears a dial tone or another indication that more dial string characters may be processed. An off-hook indication MAY also be interpreted as this kind of indication (meaning that the audio channel has been opened to the receiving party); because these characters are not a part of the GSTN subscriber address (telephone number) per se, any dial string characters that succeed either a "pause" or "tonewait" SHOULD be sent using DTMF signalling.