About: http://webisa.webdatacommons.org/21736581

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	The audio tone, or other signal, may be pre-programmed into the receiving device 408, or it may be communicated to that device with the alert message.
http://www.w3.org/ns/prov#wasQuotedFrom	freshpatents.com