At a company, there is a GXP-2000 as a central phone where most incoming calls come (it's a doctor's office). The problem is that there a lot of incoming calls (approx. 1 call every 3 minutes) at their office and the phone starts acting as it is Off Hook (in a call) although it's not. Which means that no calls can be made or received. Sometimes the IP line needs to be "reseted" and after that the phone rebooted to solve the problem.
The only two features that are configured on that IP line are autoredial and call waiting.