Snom

Snom - Firmware Update Center

Snom Wiki - FAQ/Does this phone series support encrypted calls via TLS and SRTP Outdated according to the Snom 710 data sheet wich mentions TLS and SRTP support for the Snom 710).
Snom Wiki - Interoperability/PBX/Asterisk
Snom Wiki - FAQ/How can I set the phone back to admin mode or factory defaults respectively
Snom Wiki - FAQ/How do I enable TLS functionality? “For manual TLS setup, the “Outbound Proxy” has to be configured with a “transport=tls” parameter.” Add the suffix “;transport=tls” to the Outbound Proxy URL.
Snom Wiki - How to secure a snom phone
Snom Wiki - Networking/Virtual Private Network (VPN)