SOLUTION FOR DETERMINING AN AUTHENTICITY OF AN AUDIO STREAM OF A VOICE CALL

摘要

The present invention relates to a method for determining an authenticity of at least a portion of an audio stream of a voice call connection. In the method it is received a request (410) for confirming an authenticity of at least portion of an audio stream of a voice call connection; detected a number of voice call connection specific watermark patterns included in the portion of the audio stream in question; and set (430), in accordance with a detection of the number of the voice call connection specific watermark patterns included in the portion of the audio stream, a detection result to express one of the following: i) the portion of the audio stream is authentic, ii) the portion of the audio stream is nonauthentic. The invention also relates to a network node (210), a computer program product and a system.