Whats the best Practise for on-call duty via teams external calling?

Hey community,

I'm a bit in a struggle when setting up our Teams Operator Connect Phone system.

We have an Auto attendence which is offering different menus (Press 1..., etc)

We're planning on setting up a twentyfour x seven on-call duty where customers can call and are getting redirected to the mobile phones of our technician. 

I saw the option to forward to one number, but there isn't an option to forward to multiple numbers.

How do you guys solve such a scenario, where you have to wake up colleagues mid night?

We are changing shifts weekly, always 2 guys, sometimes 3 ppl. on shift.

Thank in advance,

Schnittlauch