This document outlines the process for mobile originated and terminated calls in 3G networks. It describes the steps for a mobile originating call in 3 parts and a mobile terminated call in 3 parts, including setting up the GTP tunnel for transport. The document breaks down the end-to-end call flows for 3G connections.

1. 3G call Flow

2. MOC – Mobile Originated Call (1/3)

3. MOC – Mobile Originated Call (2/3)

4. MOC – Mobile Originated Call (3/3)

5. NRT – GTP Tunnel Setup

6. MTC – Mobile Terminated Call (1/3)

7. MTC – Mobile Terminated Call (2/3)

8. MTC – Mobile Terminated Call (3/3)