approximate value
00:29:52
customized
00:29:17
increase
00:27:37
on-hook signal
00:27:19
identification character
00:27:01
complementary state
00:26:58
traffic capacity
00:25:12
updating
00:25:05
communication protocol
00:25:04
manipulate, to
00:24:23
voltage limiter
00:23:11
absolute system of electrical units