Change port in SIP Trunk

I have change port 5060 everwhere in FreePBX and in my 2 sip-phones.
FreePBX System Status … shows

IP Phones Online 2
IP Trunks Online 1
IP Trunk Registrations 0

Great … but registration = 0 since I guess it depends on that I still have that 5060 hanging around somewhere in the system.

sip show peers … shows
VoIP VoIP/555xxxxx N 5060 UNREACHABLE

My question is … how do I tell that VoIPVoIP trunk which port to use ?
Is it a FreePBX or my VoIP provider problem ?