About: call progress tone

Premodifier: call progress
Head noun: tone

Same concepts
http://dbpedia.org/resource/Call-progress_tone

Broader concepts

label	provenance	confidence

Narrower concepts

label	provenance	confidence
busy tone	isap:176821140	0.817812
busy signal	isap:491884565	0.694124
ring	isap:176968310	0.381713