SIP trunks with good voice quality

Hi! Not sure this is the right forum.

I am using a SIP trunk with average prices US$0,015 for fixed phone and US$0,06 mobile in Europe, Latin America and the US. However, voice quality is a mess and when I need to do calls to Latin America, it will simply not work well, people on the other side cannot hear me well, as a result I lose business.

Therefore, I am looking for a new SIP provider, if possible with the average prices above and:

1. Good voice quality in Europe, Latin America and...

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