ZyXEL Communications omni.net Plus - Manual (Page 182)

Technical Reference for ZyXEL omni.net series
C-2
RJ-11 POTS Port Phone 1&2 (for omni.net LCD/LCD+M/Plus)
RJ-11 Connector Pin Assignment
Pin Description
1 Not Connected
2 Ring
3 Tip
4 Not Connected
Table 81. RJ-11 Connector Pin Assignment