Pls Note – The VoWifi capable UE must have pre-loaded with VoWifi enabled operator profile, i.e. Here Security is of prime concern since traffic is transited via Internet which is prone to be exposed. Here Traffic exchanged between ePDG is fully secured using IPSEC Tunnel which provides security.
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UE with VoWifi & IPSEC Tunnel Support: The VoWifi requires User Equipment or Handset with VoWifi Support. We will see detailed call flows in coming slides AAA is used for Signaling & Authentication it doesn’t carry Media such as Voice Call etc. EAP Stands for Extensible Authentication Protocol. GPON extends the capabilities of its two predecessors, asynchronous transfer mode (ATM) PON, also known as APON, and. This AAA Server provides UE authentication in VoWifi via the EAP Authentication method. The gigabit passive optical network (GPON) is an outcome of the full service access network (FSAN) alliance and is specified in the ITU-T G.984.x series of recommendations, which were finalized in February 2004. ePDG carries both Payload and Signaling TrafficĪAA : As you know, AAA does 3 basic tasks such as Authentication, Authorization, and Accounting. With help of Wifi Offload of Voice Traffic, the ePDG helps mobile operators to expand wireless service coverage, reduce the burden on the wireless network, and make use of existing infra to reduce Costs. Here ePDG is acting as Gateway for untrusted non-3gpp traffic. The service is offered to SIM based mobiles & Tabs where Complete Authentication is done for usersĮPDG: ePDG Provides secure Wireless LAN access to UEs to further reach out to the P-GW and form a PDN connection in the EPC network. Here since traffic is coming thru Internet using non-3GPP access, we use a special IP tunneling mechanism example IPsec for making it secure. In Untrusted Access, the network would require UE to go through an additional authentication and security process. Since traffic is transiting via Internet here, there is no trust on Access Path & hence we call it as Untrusted Wireless LAN. Here Traffic comes on Operator ePDG from Internet & further its terminated to Operator PGW. Here traffic goes from User to Internet & then it reaches Mobile Operator Network to which SIM Belongs.
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The VoWifi Access from Home Broadband or DSL is classic example of this type of Access. Untrusted access involves any form of Wi-Fi connectivity that the provider has no control over, for example, public hotspots, home Wi-Fi and Open Wifi Hotspots. The untrusted Wifi concept was first included in the 3GPP Release 6 (2005). The 1st one is Untrusted Wireless LAN where there is no trust of Operator in Wifi Network and Its - Access Path.