Patent ID: 7684565
Filing Date: 2010-03-23
Classification: H04L,H04M

Abstract:
1. A system for securely transmitting Real Time Protocol voice packets during a communication session with a remote multimedia terminal adapter over an Internet protocol network, the system comprising: a local multimedia terminal adapter receiving the voice packets having a time stamp synchronization source operable to synchronize cryptographic operations between said local multimedia terminal adapter and said remote multimedia terminal adapter, the local multimedia terminal adapter comprising, a local key stream generator for generating a first key stream; and a packet encryptor that encrypts the voice packets using at least a portion of the first key stream to form encrypted voice packets; the remote multimedia terminal adapter receiving the encrypted voice packets, the remote multimedia terminal adapters further comprising, a remote key stream generator for generating the first key stream in order to decrypt the encrypted voice packets; and a packet decryptor decrypting the encrypted voice packets using the first key stream, wherein both key stream generators generate a second key stream when a component used to transmit the Real Time Protocol voice packets changes during the communication session and the packet encryptor and packet decryptor use the second key stream, wherein the second key stream is generated when the system switches from a first to a second coder/decoder for compression/decompression of the voice packets.