Noob here. I need to set up an SIP Softphone in a cell phone to connect to the 3CX IP PBX. I have a dynamic domain name and I have a dlink di-624 router between the 3CX and the Internet. In other words from a wifi cell (or any remote SIP device), I need to be able to connect to "firstname.lastname@example.org" where the my.dnsalias.com resolves to the Internet IP of my LAN here. I tried opening a bunch of ports mentioned in the general settings of 3CX. Doing that doesn't help the lcients I am using (Express Talk from a remote PC, and Fring from a smartphone) cannot connect when using either "email@example.com" or extension@<internetIPaddress>" If I put the 3CX computer in the DMZ of my router, then it works, but only with "extension@<internetIPaddress>" However, DMZ's not a real option for anything but testing. I saw something in there about a DNS entry to be made, but it points to a blank page in the FAQ. I think what I need is just better info on what ports to open up to get it working without DMZ and then info on the DNS stuff to get it working with the dns address I'm using. Thanks.