About: http://webisa.webdatacommons.org/255796136

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A call progress detector 22 functions to detect ringing, busy, ring back signals and other signals generated by the telephone network 16.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk