Expansion modules

Last Updated : Apr 17, 2026 |
Prolog information
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.
Important:
Avaya J100 Expansion Module does not support Hot plugging. Connect all the expansion modules to the phone before connecting the phone to a power source.
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:
Model
Attached Button module1
Attached Button module2
Attached Button module3
Call lines/Features/Applications
Switching between pages
Avaya J169/J179 IP Phone
Yes
Yes
Yes
24 on each page
Yes
Avaya J189 IP Phone
Yes
Yes
No
24 on each page
No
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:
Power adapters
USB power
1 JEM24 modules
2 JEM24 modules
PoE (Side switch position L)
USB Type-A power limited to 100mA
Not supported
Not supported
PoE (Side switch position H)
USB Type-A and USB Type-C
Supported, with USB Type-A and Type-C port shared power limited to 900mA
Supported,with USB Type-A and Type-C port shared power limited to 500mA
5V power adapter
USB Type-A and USB Type-C
Supported, with USB Type-A and Type-C port shared power limited to 900mA
Supported,with USB Type-A and Type-C port shared power limited to 500mA
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, the POE side switch should be set to H position or use a 5v 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.
Note:
When an Avaya J100 Expansion Module is attached to the Avaya J169 IP Phone, the display screen changes to gray scale.