Advantages
Security is not the only reason to pass Voice over IP through a virtual private network, however. Session Initiation Protocol, a commonly used VoIP protocol is notoriously difficult to pass through a firewall because it uses random port numbers to establish connections. A VPN is also a workaround to avoid a firewall issue when configuring remote VoIP clients. However latest VoIP standard STUN, ICE and TURN eliminate natively some NAT problems of VoIP.
Read more about this topic: Vo IP VPN
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