How to use landline as a trusted number

From Apple's instructions:

If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Choose to verify the number with a text message or automated phone call, and click Continue. To remove a trusted phone number, click next to the phone number you want to remove.

Two-factor authentication for Apple ID - Apple Support

Just nominate it. The code will come as a spoken message (keep a pencil and paper by the phone!).

From: https://support.apple.com/HT204915

'Enter the phone number where you want to receive verification codes when you sign in. You can choose to receive the codes by text message or automated phone call'