Call2Teams - Customer
A SIP Error 480 is presented. This kind of error usually suggests a networking issue.
This error is usually seen on incoming call failures and is appended with "and PNH got delivery errors from all of them..."
This is Microsoft advising that it has been unable to route to the expected endpoints for the Teams Client.
This is likely to be an issue between the Microsoft service and the affected user's Teams Client.
Customers may need to raise a support ticket with Microsoft to investigate if the issue persists.
Reviewing the Microsoft call logs may assist with this, see this article on accessing them: Accessing the Microsoft Call Logs