A secure Internet Protocol (IP) telephony system, apparatus, and methods are disclosed. Communications over an IP telephony system can be secured by securing communications to and from a Cable Telephony Adapter (CTA). The system can include one or more CTAs, network servers, servers configured as signaling...http://www.google.com.au/patents/US20050027985?utm_source=gb-gplus-sharePatent US20050027985 - Internet protocol telephony security architecture
