Do you need advice on organizing a budgetary automated system for collecting meter readings via telephone?

Question

Telephony

Good afternoon!
There is a task - a person calls a certain phone number, listens to a greeting. After that, dials from 1 to 999 digits on the phone, listens to the next greeting, then dials a 6-digit number and hangs up. After that, the system records the time of the call in the Excel table (in the database?), And the first and second numbers in two columns.
Question 1.
How to organize all this in the most budgetary and simple way?
Question 2.
Is it possible to make this system multi-channel?
I will be very grateful for the answers!
PS All this is done to automatically collect meter readings for residents of apartment buildings :)

Answer 1

Asterisk for sure!

Answer 2

how do you like this option ?

Moreover, the application offers advanced key response and programming options to create a sophisticated telephone interactive response system.