If a Local IP Phone loses its registration to 3CX, which step is NOT recommended for troubleshooting?

When troubleshooting a Local IP Phone that has lost its registration to 3CX, changing the SIP method filter is not a recommended step. The SIP method filter is a specific setting that would limit the types of SIP methods that can be used for communication between devices and the server. Modifying this filter can introduce additional complications without addressing the underlying cause of the registration issue.

In contrast, rebooting the phone can resolve temporary glitches, checking the Server Activity Log can provide insights into what may be happening on the server side, and starting a Wireshark Capture can help analyze the traffic between the IP phone and the server for further diagnostic information. All of these steps focus on identifying and resolving issues rather than altering the configuration of SIP methods, which may obfuscate the root of the problem.