No Audio between FreePBX and Vapi Assistant

I have made some corrections to my FreePBX configuration for Vapi, and both endpoint, AOR, and SIP registration are now working.
However, I am still not able to hear the AI assistant during calls, and the AI assistant cannot hear me either.

To help you better understand the issue, I have attached screenshots showing all relevant configuration files and settings.

Could you please review my setup and advise on what might be causing the lack of audio in both directions?
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