Silent Phone deploys the ZRTP peer-to-peer encryption protocol which is recognized as the leading standard for secure end-to-end communication in a Voice over Internet Protocol (VoIP) telephone call.

FORBES: Silent Circle Adds Android For Encrypted Voice And Video Calls

Cable operators want to be able to offer the "quadruple play" of communication bundles--Internet, television, voice-over-IP and wireless telephony.

FORBES: Cable Finds Its Voice