GSM, LTE, UMTS and IMS Call Flows

The call flow diagrams were generated using EventStudio System Designer.

GSM Circuit Switched Call Flows

GSM Handover Call Flows

GSM GPRS Sequence Diagrams

3G UMTS Sequence Diagrams

SIP and H.323 Call Flow Diagrams

IP Multimedia Subsystem (IMS) Call Flows

LTE/SAE Call Flow Diagrams

ISDN User Part (ISUP) Call Flows

V5.2 Protocol Call Flows