Register trunk as extension to Fritz!Box pbx

I have a fritzbox 7170 that I plan to use as an FXO for my phone line.
My provider uses SIP but doesn’t give me the password unless I buy my own €200 modem.
They only provide the anolog port on the modem. I don’t want to buy an expensive FXO device,
If i’m planning on buying the modem soon anyway. For now I need something temporary.
I set up an extension and a fixed line and can make calls if i put one of the phones on it’s network.
However, all my phones have webhooks set up and too many dumb switches everywhere,
I can’t put all the phones on it’s network. I have set up another interface on my freepbx box that is.
Can I, with the details that would normaly go into a phone, register a trunk so I can make calls?
Other posts i’ve seen all say “if you want to do that, just make an inter-pbx trunk.”
In this case I can’t, it doesn’t let me. This is all jank, I don’t care.

I would like to follow up, saying it works now. Not to leave you hanging,
I added my second interface into the “Local Networks” section of the asterisk NAT.
After that I put in my credentials and server ip/port into the trunk, with outbound auth.
Not sure if the fritzbox is lenient in it’s sip, but that works for me.

I use several fritzboxes (6890) as analog&DECT-sip-adapter. They work ok. There is just one problem. After freePBX was down and restarts, sometimes the Fritz!Box does not reconnect for 10-15mins or so.

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