I'm looking for a way to convert my Android phone into a telephone switchboard.
The goal is to have the ability to redirect incoming calls to another telephone number. But if this is not possible (I don't know if any Android terminal is able to redirect calls in real-time), perhaps there is an intermediate solution: the mobile pick up the telephone, launches a recorded message ("Please, say what is the purpose of your call"), waits until the user says something, and then put a music loop until somebody picks up the telephone.
I don't know if I explained :) But the final goal is to substitute an expensive internal switchboard with an inexpensive cell phone network driven by an Android phone. Is there something similar?