How to make a callback for a specific list of numbers?

Question

Asterisk

Good afternoon,
There is Elastix 2.5
You need to make a callback that will
1. receive calls to a specific number
2. check the list of allowed numbers for callback
3. call back the caller and give IVR
The main emphasis is on the list of allowed numbers, so that without any pins but also strangers keep out

Answer 1

1. In Google there are callback implementations on Elastix
2. In the found implementation you like, embed the check of the number by querying the database. For example, via func_odbc