Remote extesion outbound call dropped after 30 seconds

Configured extension in the remote office location, inbound call has no issue. Outbound call to the cell phone, landline and extension in the main office got dropped call after 30 seconds??? Can someone help?

I have tested in multiple remote locations with same result. Firewall in the remote location enabled/disabled no different in result. This is S100 and the current fw is  Thanks. 


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