3 ms·
Not necessarily. It depends on the installation and does, usually, contain 2 tones. For instance - https://en.wikipedia.org/wiki/Precise_Tone_Plan https://en.wi
by Rebellos 11y ago
Not necessarily. It depends on the installation and does, usually, contain 2 tones.
For instance - https://en.wikipedia.org/wiki/Precise_Tone_Plan https://en.wikipedia.org/wiki/Precise_Tone_Plan - none of two frequencies used in NA's dialtone is E.
- byron_fast 11y agoAh well it always worked for me... may have been a case of "close enough for rock'n roll" though.