Aastra Telecom 41-001286-00 Manuel D’Utilisation

Aastra MBU 400 User Guide

This section describes other tasks you can perform, if required, on the MBU and the 
Aastra 420d Handsets.

In order for handsets to register with the MBU you must press the 

 button on 

the rear of the MBU. Each time you reset the MBU, the handsets must re-register. 
Make sure handsets are within range of the MBU to register properly.

Note: When you reset the MBU, the MBU waits until active calls have been 
completed on the handsets before starting the reset process. If a registered handset is 
off during an MBU reset, it reconnects when turned on as long as the MBU was not 
factory defaulted.

To reset the MBU:

• Press and release the 

 button on the rear of the MBU (do not hold it down) 

On the front of the MBU, 

 lights steadily during a reset and 

 flashes. 

When the reset is complete 

 lights steadily, indicating the MBU is ready to 

use.

Handsets will usually register without any action on your part if they are close to the 
MBU 400 after a reset. If required, you can manually register and deregister a 
handset. Make sure your handset is within range of the MBU.

To register or deregister the handset do the following.

1.  In Idle mode, press OK z to display the Main Menu.

2.  Select 

Settings 

 

and press OK z.

3.  Select 

System settings

, and press OK z.

4.  Select 

Handset settings

, and press OK z.

5.  Select 

Register handset

 or 

Deregister handset

 and press the 

Yes

 softkey at the 

prompt.

If registering, the handset prompts to be placed in its charger cradle so auto-
registration can occur.

Listing all Registered Handsets

To view a list of all registered handset do the following.

1.  In Idle mode, press OK z to display the Main Menu.

2.  Select 

Settings 

 

and press OK z.

3.  Select 

System settings

, and press OK z.

4.  Select 

Handset settings

, and press OK z.