About: http://webisa.webdatacommons.org/308504115

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	In step 213, if a call has been on hold for more than a predetermined period of time, such as thirty seconds, control passes to step 234, where a call waiting tone is sounded on the handset 11, to remind the user of the held call.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com