One way voice

Respected sir

I am a new asterisk user , i had setup an asterisk server ,but when i call other extension i can hear only one way voice eg:- if ext 100 call ext 200, ext 100 can hear voice of 200 but ext 200 cant hear ext 100 voice

Please help me …

One way audio is normally a NAT or firewall problem.

You have posted no real information that would alow a diagnosis.