The problem is returned. This is the part of 3CXIvrServer.log reguarding my call. As you can notice the prompt is corrected added but nothing is played from Ildocidedaleidigitato.wav to Digitiunoperconfermare.wav
11:24:01.913|8080|VXIMachine.cpp(1072):IvrDll, CallSession:

rompts_Play(), Play Queued files
11:24:05.926|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Digitiorailcodicecdc.wav
11:24:07.363|10944|VXIMachine.cpp(1072):IvrDll, CallSession:

rompts_Play(), Play Queued files
11:24:10.960|10944|VXIMachine.cpp(1108):IvrDll, CallSession:

rompts_Stop(), Stop playback
11:24:15.983|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Ildocidedaleidigitato.wav
11:24:16.007|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Numero4.wav
11:24:16.024|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Numero7.wav
11:24:16.040|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Numero8.wav
11:24:16.059|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Numero9.wav
11:24:16.075|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Numero6.wav
11:24:16.099|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Digitiunoperconfermare.wav
11:24:16.162|10944|VXIMachine.cpp(1072):IvrDll, CallSession:

rompts_Play(), Play Queued files
11:24:20.108|10944|VXIMachine.cpp(1108):IvrDll, CallSession:

rompts_Stop(), Stop playback
11:24:20.108|10944|api\VXIpromptImpl.cpp(266):IvrDll, VXIpromptImpl::Impl::Queue(), Warning! Ignoring TTS in (text/plain;charset=wchar_t). Text is 'Sorry, I didn't understand you. '
11:24:20.108|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Digitiunoperconfermare.wav
11:24:20.120|10944|VXIMachine.cpp(1072):IvrDll, CallSession:

rompts_Play(), Play Queued files
11:24:27.161|10944|VXIMachine.cpp(1108):IvrDll, CallSession:

rompts_Stop(), Stop playback
11:24:27.179|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\lapreghiamodiattendere.wav
11:24:27.721|10944|VXIMachine.cpp(806):IvrDll, CallSession::RegisterPrompt(), Added prompt C:\ProgramData\3CX\Data\Http\Interface\ivr\FirmaDocumenti_5\Attenziocodicenoncorretto.wav
11:24:27.734|10944|VXIMachine.cpp(1072):IvrDll, CallSession:

rompts_Play(), Play Queued files