How to organize the route correctly?

Question

Telephony

Good afternoon!

Please help me with the next one.
We use the services of a provider (Internet and sip telephony).
2 cables enter the office, one for the Internet, the second for telephony.

The telephone cable must be connected to a raspberry pi single board computer with FreePbx on board.
But how to make it so that we also have access to this computer on the local network?

There is practically no experience in this matter, I would like to hear the opinion of a more competent one in this matter.

At the moment, there are 2 ideas:
1. connect the telephony cable to the router (mikrotik) and also connect the raspberry pi to it, configure a separate Vlan for these ports.
2. we connect according to the first scheme, but instead of Vlan, configure static routing, from raspberry pi to this telephony port.

Answer 1