Main number returning "not in service" to all external callers for 3 days — internal Zoom calls work fine

Hi everyone,

We have been experiencing a complete inbound service outage on our main number for 3 days now.

The problem:
When anyone calls our main number (assigned to our Auto Receptionist) from an outside phone (cell or landline) they hear "the number you dialed is not in service." However, calls made from within the Zoom environment to the same number work perfectly.

What we've checked:
- The number is assigned to our Main Auto Receptionist and shows "Normal" status
- IVR menu is properly configured and working
- Business hours are set to 24/7
- No changes were made to our settings before the issue started
- Tested from multiple external phones (cell and landline), all fail with the same message
- Other direct user numbers on our account also cannot receive external calls

Steps taken:
- Opened multiple support tickets
- Contacted Zoom support via chat and phone
- Zoom support confirmed the issue but has not provided a resolution
- Attempted to escalate but tickets remain at Normal priority

Based on our troubleshooting, everything on the Zoom admin side is configured correctly. Since internal calls work but external calls don't, this appears to be a carrier-side routing issue.

Has anyone experienced this before? How was it resolved? Any suggestions on how to get this escalated faster? We are getting so frustrated here.

Any help is appreciated. Thank you.