[Asterisk-Users] ECHO Tutorial

[Daniel Salama]

Is there anyone that could explain to me the phenomenon of Echo or at  
least point me where I can learn more? Why is this affecting the VoIP  
world so much and not the regular PSTN analog world? What does the  
PSTN industry have that they can handle such high volume of calls and  
there is "no" echo problem?

Thanks,
Daniel
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