The JEM24 button module is supported with the J169, J179 and J189 phones.

J169/J179 with JEM24 Expansion Modules

These phones can support up to 3 JEM24 button modules. However, depending upon the amount of power supplied by PoE, it may be necessary to power the phone using a separate 5V power supply.

J189 with JEM24 Expansion Modules

These phones can support up to 2 JEM24 button modules. For a J189 with JEM24 buttons modules, power can be supplied by PoE or a 5V power adaptor.

• When the phone is powered using a 5V power adaptor, you can connect up to 2 JEM24 expansion modules.

• On the back of each J189, a switch sets the phone's PoE power level as either high (H) and low (L). On PoE power J189 phones with JEM24 buttons modules attached, the switch must be set to H. The switch must only be changed when the phone off.