Simultaneously 2 Mikrotik providers. 1st main, 2nd telephony?

Question

Mikrotik

Good afternoon.
Now there is 1 provider, a lot has been brought to its white address and I don’t want to refuse it.
To implement IP telephony, it is necessary to connect another provider through which digital telephony itself should work. (We will purchase Asterisk.) So far, this is all only in the plans, and there is not enough knowledge to confirm the entire implementation process with confidence.
Question - how to implement at the level of Mikrotik? PS The search engine leads to 2+ year old topics that no longer exist.

Answer 1

To implement IP telephony, it is necessary to connect another provider

What for?
Tritely use QOS to set the priority of traffic, where the highest priority is given to IP telephony and further in descending order, depending on your needs.
The 2nd provider can be connected and used as a fallback with the above settings.
If there is a need to save money, talk to your provider and set up a radio point as a 2nd spare channel.

Answer 2

If the condition is 2 providers, then ...
Plug 2 provos into Mikrotik into a separate port, naturally remove this port from the bridge (if it is there), configure it to receive Internet, make a masquerade rule for this interface. Then dst-nat to Asterix's internal ip address (if you need a DMZ zone). Or just forwarding the necessary ports to the internal ip of the asterix.
Forwarding example
/ip firewall nat
add chain=dstnat dst-address=your second external IP (or select an ethernet port instead) protocol=tcp port=443 action=dst-nat to-addresses=ip asterix to-ports=443