Two scenarios are used to send a fax via a SIP session: T.38 and Pass-trough [another link]. Detection of a fax-sending session is rather easy in first scenario (because fax transmission is explicitly mentioned in SDP body). In second method, a regular RTP call (G.711 Protocol) is established and after that, some beeps (CNG and CDE) are sending between two parties and they detects the fax call. I'm looking for a real-time method (deep learning, anything) to detect fax-initial-signal from a wave.
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Tool/framework recommendation questions are off-topic. – David Makogon May 30 '18 at 13:57
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I'm just looking for a keyword :-) Something like like "Keyword Spotting''. But a c++ library/framework is not for me. However, I deleted the line about framework from the question. – Majid Asgari-Bidhendi May 31 '18 at 11:25
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Goertzel algorithm + time measurement. Looking into DTMF detectors code or better yet code from SpandDSP (there might be hints related to inteoperability) might give you more clues.
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