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Enhanced Packet Data Gateway (ePDG)
ePDG is the part of SAE which interfaces with non-trusted 3GPP IP systems. It acts as a secure termination node for IPsec tunnels established with UE.  

What are un-trusted non-3GPP accesses?

When a network operator doubts on the secured interface of a technology its categorized as un-trusted. The very good example is of WiFi hotspot.   
SAE 
Gateway
PDN
ePDG
IP Networks
Serving
SGSN
3GPP LTE
GSM,HSPA,
TD-SCDMA
CDMA/
Trusted 3GPP
Non-trusted
3GPP
Operator’s IP
Services (IMS, PSS etc.)
ePDG
IPsec stands for Internet Protocol Security. Its a set of  protocols to secure wireless communications by encrypting each packet transfer. This is only implemented for All-IP networks.
 
EPDG is shown in diagram below:
Multiple cores from different networks can be integrated in a single LTE node. Enhanced back haul security through IPSec tunnels. Rapid packet processing. Real time subscribers, service and applications monitoring for in-line services.
What is IPSec for Internet Protocol?
Key Features of LTE EPDG :

Abbreviations:

SAE: Serving (S) System Architecture Evolution.

SGW: SAE Gateway.

IPsec: Internet Protocol Security.

UE: Use Equipment.

MME SGW PGW ePDG

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