VoIP over VPN (PPTP,IPSec,OpenVPN)
In commericial sector, VoIP over VPN technology is usually employed. For higher security, IPSec VPN is widely used for message communication between locations or countries. You may PPTP VPN for less secured environment. The setup for PPTP is much simple and easily configured. In general, two locations must have VPN routers such that the local network segment can be seen by the devices or servers located in either sides. As the result, other parties in between locations is very difficult to tap your message for checking.
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