Inbound call no ringing

When I call the 800 number the SBC says that the call is fine but I am not getting any dial ringing in the progress of the call. I have included export of the call. We just started using the SBC as an inbound device have a missed a setup function to clear up this issue?

Hello

Would you try to set the following values in the NAP, please?

Go to NAPs -> Select the NAP -> Network Address Translation (NAT) -> Remote Method For RTP -> Force Passive Mode
Go to NAPs -> Select the NAP -> Network Address Translation (NAT) -> Remote Method For SIP -> Automatic NAT traversal

And, it will work.