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Carrier audio comparisons


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So carriers use different codecs over different technologies, and codecs may change when a call is going between carriers or to landline. 


Is there a way to actually compare test, a long with some popular VoIP applications (Hangouts, Skype)? Is there an audio program that has samples or where a sample can be created and then ran through the various codecs and bit rates?


Also, is there a list somewhere that already lists the different codecs and bitrates that each of the carriers use over their varying technologies? 

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