Can Android VoIP voice conversations be decoded? I can eavesdrop on your Android VoIP communication

摘要

Voice over Internet Protocol (VoIP) is increasingly used by both individuals and corporate users. Recentrnstudies had suggested that communications using VoIP apps may not be encrypted, although it has not beenrndemonstrated that original conversations could be recovered from unencrypted communications that werernsubsequently intercepted. In this research, we propose a process for codec identification and decoding ofrncaptured communications from 15 popular Android VoIP apps. We are able to recover the original voicernconversations from intercepted app-to-app voice calls of nine apps and app-to-phone calls from 10 apps.