How many ADD-ON can cannect each digital phone R-8.1(OXO )

[shirantha]

Hi,

I want to attach an add on module of 40 keys on OXO with 4039 operator console. Kindly let me know How many units can connect for each digital phone , R -8.1

Thanks,
Shirantha

[rui.costa]

The maximum of Add-On Modules of the type AOM40 (40 keys) per set, is three.