Abstract:

With the increasing popularity of VoLTE, VoLTE users and VoLTE traffic in mobile networks continue to increase. In the context of the continuous popularization of 4G and 5G networks, it is of great significance to carry out research on VoLTE traffic. This paper introduces VoLTE network architecture and the principle of speech coding. Based on the analysis of the correlation between VoLTE signaling data and voice data, combined with the fact that the integrity of VoLTE session message is insufficient, this paper proposes a method of VoLTE speech analysis and processing based on signaling guidance and without signaling guidance. By comparing AMR voice transmission format and audio format, this paper proposes the method of format conversion and AMR voice recovery. Through association fusion, the connection information related to VoLTE calls are obtained, which provides important information guarantee for lawful network forensics.

Key words: VoLTE, AMR coding, voice recovery, network forensics