How to automatically reset a call and send SMS with the caller's number to another subscriber?

Question

SMS

Condition: There is phone A (manager's phone), there is phone B, which receives a lot of forwarded calls from other numbers.
Condition: Do not pick up the phone on an incoming call to number B (a lot of call forwarding costs), but hang up and quickly transfer the number of the caller to the manager for a call back (to number A).
I would like to implement this at low cost, based on some kind of DIR-320 router and a modem.
In the future, a more complex option is planned, a chime, with automatic connection between the manager and the client (perhaps this is not as difficult as it seems to me, I will be glad to give advice here too, especially on the required technical resources).

Answer 1

The best option would be a device and software for it
sim-bank.ru

Answer 2

You can immediately start with the second, for this you need Asterisk and a number of scripts. You can take this as a basis