Actually I found a way. The GCEV_TELEPHONY_EVENT is only raised for RFC2833 DTMF, not for inband audio DTMF, so I can tell the difference and block TDX_CST events, once I received the telephony event.
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Actually I found a way. The GCEV_TELEPHONY_EVENT is only raised for RFC2833 DTMF, not for inband audio DTMF, so I can tell the difference and block TDX_CST events, once I received the telephony event.