Telephone System Call Routing
1:01:21
Introduction to Voice Over IP
30:41
Computer Security Basics
54:03
Introduction to Telephone Systems
51:20
Network Mapping
17:34
Cybersecurity Architecture: Five Principles to Follow (and One to Avoid)
14:54
Building a Plain Old Telephone Service (POTS) Intercom
13:20
AT&T Archives: Switchboards, Old and New (Bonus Edition)
20:44