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Starting with firmware version 8.4.27, all snom firmware versions for all snom phones with the exception of the D120 & D305 include the ability to build secure VoIP-Infrastructures via OpenVPN-Technology.
Snom decided to use OpenVPN because it is compatible with SSL/TLS, RSA Certificates and X509 PKI, NAT, DHCP and TUN/TAP virtual devices.
This means that almost every current Snom phone could have a built-in VPN client.
Further information about the configuration can be found here: Configuring VPN on Snom Deskphones
Of course, they also need a VPN server.
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