Hardware questions?

Question

Telephony

It is desirable for all links and cost:
1) A system that allows you to receive calls on 1 phone from both mobile and home
2) Call parallelization system. (That is, a person always calls on the same phone, and then the girl answering the calls can transfer him, for example, to the head of the department)

Answer 1

google.com, price: Free.
You have a complex request in which you can’t buy a box, press a button and everything will work.
You need a telephony system based on PBX (it is better to take IP telephony on Asterisk), to receive calls from mobile phones you need a GSM gateway.