Telecommunications Basics Part 3
11:23
Telecommunications Basics Part 4
22:29
Telecommunications Basics Part 1
21:35
Telecommunications Basics Part 3
22:13
Telecommunications Basics Part 2
18:51
The Evolution of Voice Over IP (VoIP)
9:36
‘Why in God’s name should Trump get a thank you?’: Fmr. Russia ambassador shreds Vance over Ukraine
13:12
Telephone Basics Part 1
10:25