Table of Contents:

Definition and Overview

1. Network Architecture

2. Positive-Balance Call Origination

3. Positive-Balance Call Termination

4. Mid-Call Zero Talk Time at Home

5. Zero Talk Time at Home

Self-Test

Glossary

PDF of this tutorial

The prepaid subscriber initiates a call within the home area. When the S_MSC detects the origination attempt, it sends an ORREQ to its RSU. The RSU determines that the MIN is a prepaid account and queries the market server for talk time available to this account. The market server returns zero available minutes of talk time to the RSU.

The RSU sends an orreq to the S_MSC to indicate zero talk time and the need to play the insufficient balance announcement. The S_MSC plays the insufficient balance announcement to the subscriber and releases the call.

Figure 5: Start of Call Zero Available Minutes