When thinking about migrating to state-of-art VoIP telephony solutions, hotels owners feel headache. There are already many special hotel analog phones in their guest rooms, most of them used to be customized to fit their businesses and services which can only be cultivated in years. Usually it is impossible to find IP Phones in market so proper for their distinct services, their customers may not want a change as well. The most important part may also be, replacing all these phones would cost too much. Which make things worse, more and more hotels are providing internet services to guest rooms via Wi-Fi, which is obvious more convenient and better for customers’ needs; When there are no internet cables in each room, it is unlikely to deploy IP Phone as most of them need wired internet connections