PBX is sending the wrong media IP

Hello, i got help building An asterisk system and all was done fine but when making test calls to sip provider, we get rbt but no audio both ways. when sip provider technician run trace they say my pbx is sending wrong media ip. How can we solve this problem?

If behind NAT, have you configured the respective channel driver (chan_sip or chan_pjsip) to know it is behind NAT with the proper external IP address?

And if using chan_sip, why are you using a deprecated driver? (It is important to say which driver, and somewhat important to say which version of Asterisk.)

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