A 3G UMTS originating voice call call setup involves complex signaling to setup and release the call.
- RRC (Radio Resource Control) signaling between the UE and RAN sets up the radio link.
- RANAP (Radio Access Network Application Part) signaling sets up the session between the RAN and the Core Network (MSC).
Click on the image to see the full call flow. You can click on most RANAP messages in the call flow to complete field level details of the RANAP messages.