In companies, a VPN is often used to connect branch offices or home office employees to the company network. Thanks to VPN technology, expensive direct data connections are no longer needed, as a communications link can be produced safely and inexpensively via the public Internet. While, in office environments, a router usually establishes a VPN connection, home office workers often have a software VPN client installed on their computer. At the click of a mouse button, the software creates a secure VPN connection to the office and makes the desired online services accessible.
As modern Voice over IP telephony (VoIP) transmits voice information as IP data, VPN connections can also be used for this purpose. The Virtual Private Network connection allows voice data to be securely transferred to a central telephone system. It is also possible to couple several telephone systems together through the public Internet, via VPN tunnels.