Wi-Fi Calling

In this paper, we aim to study the Generic Access Network System or GAN. Generic Access Network is a telecommunications system that extends mobile voice, data and multimedia (IMS/SIP) applications over IP networks. Unlicensed Mobile Access or UMA is the commercial name used by mobile carriers for external IP access into their core networks. More recently, the system has been called Wi-Fi Calling. Wi-Fi Calling enables to make and receive calls, send messages and check voicemails even when there is no mobile reception. The cause for the increasing popularity of Wi-Fi Calling is that it extends your coverage and it has no additional charge.