Mobile One runs on NICE CXone, so you firstly need to make sure the required NICE setup is done first. In addition to that, you need to add a few extra domains for Mobile One to work properly.
Add these three domains to your firewall allowlist:
These domains handle Mobile One's specific functions that work alongside your NICE setup.
The mobileonecloud.com domain uses Amazon Web Services. This means the IP addresses change regularly. Amazon publishes their current IP ranges at: https://ip-ranges.amazonaws.com/ip-ranges.json. Your network team can use this file to get the latest IP addresses if they need them instead of using domain names.