PSTN stands for Public Switched Telephone Network—the analog telephone network. The concept of analog has changed in past years, even in the PSTN environment, with the advent of Intelligent Networks (INs) and facilities such as toll-free phone numbers and the other value-added services (VAS).
From the perspective of penetration testers, PSTN is beneficial. Most companies have some sort of PSTN active link that is often ready to answer modem calls (wardialing, from an attacker's point of view). These include
• "Generic" RAS dialups
• IT management RAS dialups
• Mainframe RAS dialups
• Roadrunners and sale-agents RAS dialups
• The CEO's (and her daughter's) exclusive RAS dialups
• External suppliers
These "phone links" could represent attack paths—uncontrolled channels for accessing a company's internal network.
Was this article helpful?
Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.