VisualEther
EventStudio
Rust
5G
LTE
IMS
Telecom
Networking
Design
About
Describes the complete flow of circuit switched fallback from an LTE network to UMTS. You can click on most messages in the flow to reveal full details about individual messages.
Summary call flow that focuses on the interactions between 4G and 3G networks for establishing a circuit switched call.
Medium blog post on LTE to 3G circuit switched fall back
MME interactions in a CSFB call. MME interactions with MSC-VLR are covered as well.
MSC role in LTE to 3G circuit switched fallback.
eNodeB interactions in a CSFB call flow.