VMX Locator dropping calls when pressing zero

FreePBX Distro

We want a virtual extension with a DID pointed to it - no problem. We gave the extension a mailbox and use vmx locator to let callers get out of the mailbox. The operator for that mailbox is a cell phone number.

When a caller presses 0 the operator cell begins to ring and when he/she answers it everything is fine. 30 to 45 seconds later the call is dropped. Why?

The odd thing is if I set 0 to goto another extension that is forwarded to the cell phone it works just fine.

Nobody has any ideas on this?