Question : Asterisk: converting from sip to IAX2

How do i beging to setup my asterisk server and phones to work with IAX2 instead of sip

Answer : Asterisk: converting from sip to IAX2

3 main steps

1) Open port UDP 4569 on any firewall.

2) Look in your sip.conf file and duplicate all the corresponding settings in the iax2.conf file.

So for example if you sip.conf contains :-
[6152]
type=friend
secret=xxxxxx
username=6152
callerid="your name" <6152>
host=dynamic
canreinvite=yes
disallow=all
allow=ulaw
allow=alaw
context=voipuk
mailbox=6152

then add the following to iax.conf :-
[6152]
type=friend
secret=xxxxx
regextn=6152
host=dynamic
context=voipuk
mailbox=6152

3) Edit your extensions.conf and replace and DIAL commands with a reference to SIP/ with IAX2/. For example replace 'Dial(SIP/6152,60,tT)' with 'Dial(IAX2/6152,60,tT)'.