Low quality mobile phone calls

Hi everyone,

I am having problems with low quality mobile phone calls when submitting a audio file through it. I am sending the calls with a VoiceXML compatible provider (Nexmo) and it seems that the mobile compression is messing up with my audio. I have tried many file formats, rates, codecs, filters and effects. Still no good result. IMHO, the audio seems muffled, or something like that. It's happening only with male voices. I think this is related to mobile phone codecs or compression. Any ideas?

Thanks in advance, Pedro Mazzoni

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