The phrase "dial tone" refers to the sound you hear on a telephone when you pick up the receiver. It indicates that the telephone is ready for you to dial a number. Full definition
The commissioners late last month unanimously endorsed new rules that would allow telephone companies to enter the video market by offering «video dial tone» service. (edweek.org)
The trailer is titled Dial Tone and it features new weapons that will be of use. (fraghero.com)
SCORM is an old standard, as our comparison with dial tones suggests. (elearningindustry.com)