Okay. I have changed the ports on all extensions. They are 5060, 5061 and 5062 respectively.
- Ext 1 connects to losangeles.voip.ms on 5060 (works)
- Ext 2 connects to my FreePBX server on 5061 (doesn't work)
- Ext 3 connects to losangeles.voip.ms on 5062 (works)