I submitted this inquiry to 3CX staff: The extensions are not showing correctly when multiple phones are associated with the same extension. The list only shows the MAC address of the first phone associated with each extension. I also noticed that it does not show port numbers along side the IP address of the phone which would be extremely helpful. This is the response I got back from 3CX staff: "The mentioned tracking is unfix able for two devices using the same make an model as it is impossible to render back the device configured. Therefore the issue will remain as is If needed two different device models must be used in order to see the two different MAC addresses. Functionality this does not affect the phone functionality in any way but this will currently remain as is." Having this issue fixed would be extremely helpful.