S20 - Unable to call out but able receive call in

I have facing a problem on the S20 unable to call out but able to receive in calls. I have also tested pinging the SIP Server IP and also my LAN portion. Everything is working and able to ping. When calling out the phone just announce unable call out.

The following images are the Outbound route setting and showing one of the extension information setting on the outbound. 

I am not sure what else do i need to check on with the issue. Hope someone or any technician could please assist me on this.

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