0:01
This is an CCITT4 Key 6 Phone Tone.
0:01
This is an CCITT4 Key 5 Phone Tone.
0:01
This is an CCITT4 Key 4 Phone Tone.
0:01
Phone tone, CCITT4 Key
0:01
Phone tone, CCITT4 Key
0:01
Phone tone, CCITT4 Key
0:01
Phone tone, CCITT4 Key
0:11
Dial up modem connecting
0:06
Sharp high pitch glitch randomly modulating