GOautodial Open Source Omni-channel Contact Center Suite

Respected Sir,
Demian, I am really sorry to bother you again with some of my stupid questions, but as you can understand as a student and learner i really wanna know things. I wish and hope that you will be a great help

As you can see the string to register a carrier:
"register => username:[email protected]:5060/username"
Elaborating the above mentioned command:-
Here, username =SIP account username provided by my provider:password=password provided by the provider and after '@' should it be the domian ip provided by the provider and then :5060 would be the same for any carrier and after that /username=SIP account username again
[goautodial]\\providers name
disallow=all
allow=g729 \\ is this the only codec i will need to allow
type=friend
secret=password \\ this is the password provided by my SIP provider
username=username \\ username of my SIP account
host=sip2.goautodial.com \\ domain or IP provided by by SIP account provider
dtmfmode=rfc2833
context=trunkinbound
qualify=yes
insecure=very
nat=yes

Also need to know what should be string for DIAL PLAN for a carrier and how it works

Thanks & Regards
Abdul Qadir