Complete umts call flow

This document summarizes the signaling flow between a UE, RNC, and MSC server during the establishment and release of a circuit switched call. It involves the following key steps: 1. The UE sends an RRC Connection Request to the RNC to initiate a call, and the RNC forwards this to the MSC server. 2. The MSC server and RNC then perform authentication and security procedures with the UE. 3. Once authenticated, the call is established with radio bearer setup between the UE and RNC and exchange of call signaling messages between the UE and MSC server. 4. Upon call completion, signaling is exchanged to release the radio bearers and disconnect the call.