Table of Contents:

Definition and Overview

1. What is Signaling?

2. What is Out-of-Band Signaling?

3. Signaling Network Architecture

4. The North American Signaling Architecture

5. Basic Signaling Architecture

6. SS7 Link Types

7. Basic Call Setup Example

8. Database Query Example

9. Layers of the SS7 Protocol

10. What Goes Over the Signaling Link

11. Addressing in the SS7 Network

12. Signal Unit Structure

13. What are the Functions of the Different Signaling Units?

14. Message Signal Unit Structure

Self-Test

Glossary

PDF of this tutorial

A links
access links

ACM
address complete message

ANM
answer message

B links
bridge links

BIB
backward indicator bit

BSN
backward sequence number

D links
diagonal links

DPC
destination point code

E link
extended link

F link
fully associated link

FIB
forward indicator bit

FISU
fill in signal unit

FSN
forward sequence number

IAM
initial address message

ISDN
integrated services digital network

ISUP
ISDN user part

kbps
kilobits per second

LSSU
link status signal unit

MF
multifrequency

MSU
message signal unit

MTP
message transfer part

OMAP
operations, maintenance, and administration part

OPC
originating point code

PSTN
public switched telephone network

RBOC
regional Bell operating company

RCL
release complete message

REL
release message

RSP
route set prohibited test message

RSR
restricted test message

SCCP
signaling connection control part

SCP
signal control point

SLS
signaling link selection

SS7
signaling system 7

SSP
signal switching Point

STP
signal transfer point

SU
signal unit

TCAP
transaction capabilities application part

TFA
transfer allowed message

TFP
transfer prohibited message

TFR
transfer restricted message