Repair FreePBX Dropped Call Issue

I'm currently experiencing an issue with my VoIP phone system where all incoming calls are being dropped after just 2 rings. I'm using FreePBX.

The issue persists with all incoming calls without any exception.

Here's what I need:

- Diagnose the existing problem within the FreePBX system
- Troubleshoot and offer a definitive solution to the dropped calls

Ideal Skills and Experience:
- Expert level knowledge in VoIP Systems
- Proven experience with handling issues related to FreePBX
- Strong troubleshooting skills and ability to quickly diagnose problems
- Solid expertise in telephony systems
- Preferably certified in VoIP related technologies

If you are the guru I am looking for, I would appreciate your bid on this project. Can't wait to have my system back up, running without any flaws.