Smart PBX

Smart PBX is an enterprise IP‑phone service from NTT Docomo Business that turns smartphones into internal extensions. Designed for customers of services like OCN Mobile ONE for Business and Arcstar Universal One, the app enables low‑cost VoIP calling, location‑independent extension dialing across sites and on the go, and seamless switching between the device’s default phone and the PBX app.

Administrators and users can manage extension settings, representative groups, call forwarding, voicemail, and call history through a single service portal. Smart PBX provides core PBX features on mobile devices so teams can maintain internal dialing, unified call management, and reduced calling costs. Note: Smart PBX is a business service and requires application via an NTT Docomo Business sales representative; review the app license terms on the official site for details.