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

ANSI
American National Standards Institute

HLR
Home Location Register

ICC
ISUP Call Control Unit

IVR
Integrated Voice Response

locreq
Location Request Return Result Message

LOCREQ
Location Request Invoke Message

MIN
Mobile Identification Number

OANSWER
Origination Answer Message

ODISCONNECT
Origination Disconnect Invoke Message

odisconnect
Origination Disconnect Return Result Message

ORREQ
Origination Request Invoke Message

orreq
Origination Request Return Result Message

PSTN
Public Switched Telephone Network

Remote Service Unit
Signal Interface Unit

RSU
service node

SCP
Signal Control Point

SS7
Signaling System 7

SSP
Signal Switching Point

STP
Signal Transfer Point

S_MSC
Serving Mobile Switching Center

TCP/IP
Transmission Control Protocol/Internet Protocol

tdisconnect
Termination Disconnect Return Result Message

TDISCONNECT
Termination Disconnect Invoke Message

WIN
Wireless Intelligent Network