Hello everyone I have a question I noticed that I can only register my phone in freepbx by putting in the ip address of the network from which the phone is registering from. I want the ability to register from any network. Is there a way to open up registration in freepbx? I know I am missing something in the iptabes but I don’t know what it is.
note this only happens when I’m trying to register with tcp as the transport
Putting in the ip address of the phone where?
Look at Tools|Asterisk SIP Settings
There is a spot to put local networks.
I am guessing you have, but have you checked out these instructions?
http://www.freepbx.org/support/documentation/howtos/howto-setup-a-remote-sip-extension
Looking up the definition of localnet, it says it changes the SIP headers to not use NAT
http://www.voip-info.org/wiki/view/Asterisk+SIP+localnet
Perhaps changing the NAT type in the device tab would be appropriate.
Worst case, make 255.255.255.255/0.0.0.0 as your local network 
Thanks guys. I got it figured out. you have to allow 0.0.0.0.0 0.0.0.0 tcp and the sip ports 5060-5080. when I made the changes in iptables I was able to register using tcp as the transport.