On Avaya J100 Series IP Phones, the number of call appearances and feature/application buttons can be extended with the Avaya J100 Expansion Module (JEM24) and JBM24 Button Module (JBM24).

Avaya J169/J179 IP Phones supports the JBM24 Button Module and Avaya J100 Expansion Module. Avaya J189 IP Phone supports only Avaya J100 Expansion Module.

Avaya J100 Expansion Module provides 72 additional lines, and the JBM24 Button Module provides 24 additional lines for incoming calls, outgoing calls, auto-dialing, and calling features.

You can connect up to three button modules to Avaya J169/J179 IP Phones and up to two expansion modules to Avaya J189 IP Phone. Each module can be placed in stand and wall mount positions together with the phone.

The following table shows the number of button modules attached to the phone and the corresponding number of lines available on the Avaya J100 Expansion Module or JBM24 Button Module:

Avaya J189 IP Phone supports up to two Avaya J100 Expansion Modules. The following power limitations apply when you connect the JEM24 button modules to the phone:

Avaya J189 IP Phone can support two JEM24 module with USB headset USB Type-A and USB Type-C working.

• If the USB headset uses a USB Type-C cable, set the POE side switch to the H position. Alternatively, use the Avaya 5V DC power adapter.

• If the USB headset uses a USB Type-A cable, it works with a USB-A port, and the power consumption is within the port limit.