Extension in ring group no longer receiving inbound calls

And here is a screenshot of the Ring Group in question. I haven’t made any changes recently and the phone was able to receive inbound calls before. This phone is at an employee’s house on their home network so I’m not sure if maybe the home network is the culprit here. I’ve been reading how inbound calls can be affected if SIP ALG is enabled on a router (I haven’t been able to check their home network to determine if SIP ALG is enabled).