Hi all, I've setup the free demo 3CX and received a new sip account / login from Thinktel........ I can't register the sip trunk. I'm getting [ Call or Registration to ThinkTel Communications has failed. sip:firstname.lastname@example.org:5060 replied: 403 From: URI not recognized; from IP:208.68.xx.xx:5060 ] When we register new sip accounts with providers they ask for the IP, do we give them our 3CX fqdn or wan ip address? I'm wondering if that has anything to do with this.