About: http://webisa.webdatacommons.org/424726567

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	Because of the complexities of VoIP signalling and protocols it??s difficult for VoIP to traverse many types of firewall.
http://www.w3.org/ns/prov#wasQuotedFrom	techworld.com