What does SS2 stand for?

SS2 stands for "Signalling System 2 (600/750 Hz tones)"

How to abbreviate "Signalling System 2 (600/750 Hz tones)"?

"Signalling System 2 (600/750 Hz tones)" can be abbreviated as SS2

What is the meaning of SS2 abbreviation?

The meaning of SS2 abbreviation is "Signalling System 2 (600/750 Hz tones)"

What does SS2 mean?

SS2 as abbreviation means "Signalling System 2 (600/750 Hz tones)"