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<http://webisa.webdatacommons.org/prov/57097886>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/385615996> .
<http://webisa.webdatacommons.org/385615996>	<http://www.w3.org/ns/prov#value>	"They can be done with free, open-source PBX software such as Asterisk or SIP Witch." .
<http://webisa.webdatacommons.org/385615996>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<computerworld.com.au> .