Adding a service provider in a2billing

Hello

I did some research for adding a service provider in a2billing so it can actually connect the call, and what I found out is that it has to be done thou the Web GUI of A2Billing and with the use of FreePBX, but I don’t have FreePBX installed. How would I do it without FreePBX?

Thank You

just add it to sip.conf normally?

I added it to sip.conf then I tried calling a U.S. number and a2billing said its unavailable, not sure why tho , I was wondering if any one could see the problem.
My sip.conf looks like this right now:

This part is the setup for my incoming DID

[general]
register => arya6000:password:arya6000@vbuzzer.com:80/14162738101

[vbuzzer]
type=friend
user=arya6000
host=vbuzzer.com
port=80
fromdomain=vbuzzer.com
fromuser=arya6000
secret=password
username=arya6000
insecure=very
context=a2billing ; Or whichever context you would like incoming calls to be placed to.
authname=arya6000
dtmf=rfc2833
dtmfmode=rfc2833
canreinvite=no
nat=yes ; Even if not behind a nat, use nat=yes
useragent=vbuzzer/1.0
disallow=all
allow=gsm
allow=ulaw
allow=alaw
qualify=200

and this part is the setup for my trunk

[5084010000000000]
host=72.5.55.200
disallow=all
allow=ulaw
dtmfmode=auto
type=friend
context=a2billing
username= (arya6000@gmail.com.trial)
secret= (mypass)

#include additional_a2billing_sip.conf

And in the a2billing admin GUI I setup the trunk by giving it a name and I put the IP address, I put 1 for prefix and for provider tech I put"SIP"

Did I do anything wrong in setting it up?
Please give me any suggestions

Thanks