How to connect Asterisk to an IMS, the best way

Assuming, we have an IMS and a set of IMS subscribers
Assuming, we have a circuit switched legacy network (connected to the IMS) and a set of legacy subscribers

Now assume, we want to connect an asterisk to the IMS (and hence to the legacy Network), supporting a new set of asterisk subscribers/users, in order to implement some Services on asterisk for that users.

Question: What’s the best way to connect asterisk with the IMS?

x) via the Gm Interface?
x) via the Mw Interface?
x) via the Mx Interface?
x) anything else?

Thx for help

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