Hi, I want to make my asterisk server to control my carrier settings and only use it as outbound, i need some simple configurations just to control carriers, make agents login and dialplan for UK, i have idea to make agents but i don’t know how to make more then 2 carriers in settings and how to configure dialplan context,
Please help if you can
thanks in advance 
Use different technology specific device addresses based on dialplan code that implements your routing policy.
I have a similar thread here: Second Incoming VoIP IAX Connection
However I’m asking the opposite thing: to add a number as incoming-only. Maybe an answer to one of our questions will help the other. (not sure)
You should consider installing FreePBX, it will make your life easier and can achieve everything you need.