ZyXEL Communications Comet 3356 User Manual page 33

The ring types supported and the corresponding ring cadence detect criteria are:
Type
1
2
3
The ring indicate (RI) output does not toggle on the first ring if AT-SDR 0.
The RI output waveform is the same for all ring types detected, e.g., RI is on for the
total duration of the ring period.
26 Special Functions
Ring Sequence
2s on; 4s off
0.8s on, 0.4s off, 0.8s on; 4s off
0.4s on, 0.2s off, 0.4s on, 0.2s off, 0.8s on; 4s off