Poor voice transmission

Hello, when I make calls between two subscribers via asterisk, my own voice comes back to me and my correspondent cannot hear me.
What could be the cause? and how to solve the problem please?

What are the endpoints? Is it SIP to SIP? SIP to DAHDI? Are you calling the PSTN?

which device are you using to place the call? did you test mic if working with other applications

did you set up echo canceller ?

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