Incoming calls are always busy

i have installed freepbx 13. problem occurs when a call comes in.
if the caller hangs up and tries to call again, the answer is always busy. even though no one uses the phone.

anyone have the same problem?

what kind of calls connect with? FXO or FXS?

FreePBX 13 is nearing end of life. If you’re setting up a new system, you should be on FreePBX 15/Asterisk 16.

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