MAXLink ROAM is exclusive to PBXMAX subscribers. You must be a PBXMAX subscriber for the app to function. MAXLink ROAM provides full mobility for users working with the MAXLink PBXMAX communication system. When using your office extension on your mobile phone, you can access your mobile phone contacts, set presence notifications, manage schedules, transfer calls and more. Your mobile number will not appear when making calls, and you can still be reached on your direct office number.