SS7 and SIGTRAN Training
Technical training materials covering SS7/C7 protocol, architecture, and services — including a full online book published under the SS7.net brand.
Signaling System No. 7 (SS7/C7) — Protocol, Architecture and Services
A comprehensive online reference covering the SS7/C7 protocol stack, network architecture, and service layers. The material was published under the SS7.net brand and spans multiple chapters and technical appendices.
Chapter 5: The Public Switched Telephone Network (PSTN)
The term Public Switched Telephone Network (PSTN) describes the various equipment and interconnecting facilities that provide phone service to the public. The network has evolved continuously since the first manual switchboard began operating in the United States in 1878, with new technologies introduced over successive generations.
This chapter examines the structure and operation of the PSTN as the foundational transport network upon which SS7 signaling is overlaid, providing essential context for understanding how signaling messages traverse the global telephone infrastructure.
Additional Technical Appendices
- Appendix G: Message Transfer Part 3 (MTP3) Timers — detailed timer specifications for the MTP3 layer.
- Appendix H: ISUP Timers for ANSI/ETSI/ITU-T Applications — comparative timer values across major standards bodies.
About the Training Content
These materials were historically provided by Bit Tech Limited, a UK-based training provider. For historical contact details, see the Contact page. The training content was attributed to SS7.net.