About: http://webisa.webdatacommons.org/354745902

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 is difficult for VoIP to traverse many types of firewalls.
http://www.w3.org/ns/prov#wasQuotedFrom	techtarget.com