49. The system according to claim 26 , wherein said packet arrival similarity evaluation module is adapted to calculate two or more progressive similarity scores each with respect to a different instant during the progress of the real-time conversational media session, wherein each of said scores corresponds to the similarity between the packet arrival times associated with the real-time conversational media session which were available at the corresponding instant and the reference data, and said evaluation module is adapted to evaluate progressive similarity between the real-time conversational media session data and the reference data based upon the two or more progressive similarity scores.
49. The system according to claim 26 , wherein said packet arrival similarity evaluation module is adapted to calculate two or more progressive similarity scores each with respect to a different instant during the progress of the real-time conversational media session, wherein each of said scores corresponds to the similarity between the packet arrival times associated with the real-time conversational media session which were available at the corresponding instant and the reference data, and said evaluation module is adapted to evaluate progressive similarity between the real-time conversational media session data and the reference data based upon the two or more progressive similarity scores. 52. The system according to claim 49 , wherein said packet arrival similarity evaluation module is adapted to iterate the calculation of the progressive similarity scores, and as part of each iteration, a progressive similarity score is calculated for a different instant during the progress of the real-time conversational media session, and wherein said calculating is continued until said bit-stream similarity evaluation module concludes similarity or dissimilarity between the real-time conversational media session data and the reference data.