About: http://webisa.webdatacommons.org/141444832

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	Existing switch oriented architectures turn PCM on and off at every switch, including tandem switches, as the call stage progresses, based upon received protocol messages.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com