METHOD AND SYSTEM FOR LOSSLESS MEDIA STREAM TRANSMISSION AFTER SWITCHING BETWEEN ORDINARY CONNECTION AND SECRET CONNECTION Russian patent published in 2011 - IPC H04H60/91 H04W12/02 

FIELD: information technology.

SUBSTANCE: method for lossless transmission of a media stream after switching from an ordinary connection to an encrypted connection used in a system having a base station, a media gateway and a communication terminal, said method comprising the following steps: after a base station receives a message for switching from an ordinary connection to an encrypted connection from a communication terminal, a special media frame is inserted into the media stream which indicates that switching from an ordinary call to an encrypted call has been performed, and the media stream is sent to a media gateway; the media gateway determines whether to detect the special media frame or not according to media stream transmission modes at the input and the output or according to media stream transmission modes at the input and the output and media data encoding-decoding formats, and the media gateway allows the media stream to pass through from the input to the output regardless of whether the special media frame must or must not be detected.

EFFECT: reliable transmission of encrypted information owing to lossless transmission of encrypted speech.

16 cl, 1 tbl, 3 dwg