Description

Huh... that's hard to explain quickly. Let's try : First you need to know that there is a standards organization which develops protocols for mobile telephony called 3GPP (mobile network : 2G/3G/4G/5G). RAT (physical connection method to a wireless communication network) non specified by the 3GPP is called non-3GPP. RAT Wifi is non-3GPP. ePDG means Evolved Packet Data Gateway. The main role of the ePDG is to provide security mechanisms such as IPsec tunnelling of connections with the device over an untrusted non-3GPP access. It is mainly use for VoWifi (Voice over wifi). For further information : - https://www.3gpp.org/technologies/keywords-acronyms/100-the-evolved-packet-core - https://www.aptilo.com/solutions/mobile-data-offloading/3gpp-wifi-access/ - https://en.wikipedia.org/wiki/System_Architecture_Evolution#Evolved_Packet_Core_(EPC) # Safe to remove if not using VoWifi.