You will know it is corrected, when you look at your Registration Details and see that the "Contact" IP is your internal address and the "NAT Address" is present. Incoming calls may be going straight to voicemail if you have Screening After Hours or the After Hours Auto Attendant enabled.
If you can get your firewall to stop any "SIP Translations" or "Application Level Gateway" it should resolve the problem. However, in your case, we cannot detect the NAT because your firewall is replacing your internal IP address, e.g. To fix this, OnSIP sends a keep-alive when we see you are behind a NAT. To turn Airplane mode off, slide the green toggle to the left until it goes grey, you should now be able to receive incoming calls on your iPhone without them going straight to voicemail. We send a call to that port, but the NAT has closed the port already. The phones open a NAT port and then wait for an inbound call. If this is not the issue, it is typically a NAT problem. From the Administrators tab (as the Admin), go to Users and view the Status column for that user.From another user's OnSIP app, view the first user's contact page.
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