Tecom Mobile Office is a app for IG6600T and CHT MVPN service only. IG6600T is a TECOM IP-PBX. This app will act like IP phone to integrate with IG6600T, and let users can make call to the extension of IG6600T directly. The app can dial CHT MVPN code to access the outside line of IG6600T to call anywhere.