You see, in using your VoIP capabilities with the Skype program, your internet communication ventures increases in the rate of successful connections. A VoIP call using Skype connects even through firewalls. Skype also provides its VoIP network a safe way to filter calls it receives without a damn firewall. You could protect your VoIP network from unsecured calls by properly configuring the security settings of the Skype program installed on your PC. But why in hell would you disable your firewall when VoIP calls go through it with the Skype program?!