SIP Registration Failure

I have a FortiWifi 60E and it has been working fine.  I moved office which resulted in an external ip address change and now the SIP provider on my 3CX PBX can't register.  Since I can find no troubleshooting information on either the 3CX PBX or the 60E, I have no idea what the problem is.  The only change has been the external ip address.  Prior to that change, the PBX was working fine. 

Any idea what I should be checking?  Is there anywhere on the 60E that will show me the traffic going through it?  I started a ping on the 3CX box just to verify that I can monitor what is going on and I could find no reference to that traffic on the 60E.  Very frustrating :(

Bert