The most widespread solution for additional VoIP protection is the connection of remote users through virtual private networks (VPN).
A subscriber receives access to a virtual VoIP channel inside the Internet network. This channel is protected and enables the secure exchange of information making it useless for scamming and criminal purposes.
Unlike standard in telephony, the content of intercepted packages sent via encrypted VPN-tunnels is understandable only for owners of the encryption key.
The same method of connections’ protection applies to VoIP services providers.