What is RDF Routing determination function

Function:
- The RDF is an IMS-associated functional entity.
- It may be integrated into a Location Server (e.g., GMLC) or an LRF (Location Retrieval Function).
- Its primary purpose is to provide the proper outgoing address to the E-CSCF (Emergency Call Session Control Function) for routing emergency requests toward a PSAP (Public Safety Answering Point).
Workflow:
- When an emergency call is initiated (e.g., 911 call), the RDF determines the appropriate PSAP address.
- It considers various factors, such as network configuration, policies, and location information.
- The allocated outgoing address is then used by the E-CSCF to route the emergency request to the correct PSAP.
Interfaces Supported:
- For 2G/3G networks, the RDF supports MAP-based 3GPP Lg and Lh interfaces.
- For 4G networks, it supports 3GPP Diameter SLg and SLh interfaces.
- In 5G, the RDF interfaces with the AMF (NL2), NEF (NL5), and UDM (NL6) using the Ngmlc_Location service.
- Communication with Location Clients uses the Le interface, which supports a subset of the OMA Mobile Location Protocol (MLP).
Features:
- Multi-protocol support: RDF handles various protocols (Diameter, SS7, HTTP/2, SIP redirect).
- 5G security features: Includes OAuth2 protocol, mTLS, and UE privacy profile settings.
- GUI-based configuration: No need for scripting or development.
- Carrier-grade scalability: Runs on standard hardware or virtualized environments.

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