Get into AA, you need to have the caller to be in your circle of trust. If a number is recognized as a trusted number, the caller can navigate AA for further calling features ..
You might modify inboundcallroute for a direct setting if you are confident, but keep in mind that you need to disable auto-provisioning if you have your device added in your OBiTALK account.
However, a better way is to configure your OBiTALK account ... on the lefthand side
1/ Trusted Caller ID, let's say you want your Mom to use your OBi to call an international number, and your Mom number is 33334444, then, simply add your Mom's number in trusted caller ID, every time she calls in, she will hear AA ...
2/ circle of trust allows you to have your OBi friends to share your calling resources, send/receive an invite, and very simple, give it a try, you will have better experience...