<http://dbpedia.org/resource/Telephone_exchange__1>	<http://dbpedia.org/ontology/title>	"Step-by-step call"@en .
<http://dbpedia.org/resource/Telephone_exchange__1>	<http://dbpedia.org/ontology/filename>	"Sxs intra to busy.ogg" .
<http://dbpedia.org/resource/Telephone_exchange__1>	<http://dbpedia.org/ontology/description>	"Subscribers hear a different-sounding dialtone in a step-by-step call."@en .