Before revision: Common methods are: Manual verification of Call Detail Records: listening to voice recordings Identification of FAS types and using algorithms to automatically detect the FAS RTP audio signal processing: detection of voice RTP audio signal processing: detection of silence RTP audio signal processing: detection of ringback ton
After revision: Common methods are: Manual verification of Call Detail Records: listening to voice recordings Identification of FAS types and using algorithms to automatically detect the FAS RTP audio signal processing: detection of voice RTP audio signal processing: detection of silenceDFNGNVNXJVNSDJ RTP audio signal processing: detection of ringback ton