NTT Communications Business Portal Line Diagnostic Tool is an app that allows customers using the "Arcstar Universal One" service provided by NTT Communications to check the operational status of their lines.

This app allows you to receive notifications of line alarms and check the line status on your smartphone.
*A business portal account is required to use this service.

[Main functions]
・Confirm the operational status of your contracted line
・Line diagnosis tool (comprehensive diagnosis of line status)
・Inquiries to the malfunction reception desk
・Notification function when line alarm occurs