Mitel 5320 Reference Manual page 27

Mitel IP Phone Reference Guide
The LED on the front of the repeater flashes. If the LED flashes very
quickly without interruptions, skip the next step. If the LED flashes
very quickly with brief interruptions go to the next step.
iv. Register the handset.
b. Assign a repeater number
i. You must now assign a repeater number to the repeater (select: 2-7
for up to six repeaters).
Each number can only be assigned once, when using more than one repeater.
These numbers are independent of the cordless extension numbers.
ii. Take one of the previously registered networkWCS Hosted PBX
Cordless and Hook Off by pressing the Green Call Button.
The LED on the repeater stops flashing.
iii. Press a number between 2-7.
When the repeater has accepted the chose number, the LED will
flash a corresponding number of times.
iv. Accept the registration by pressing the asterisk [*] key and then the
Green Call Button.
The repeater is now automatically restarted.
The LED will go off for two seconds, flash for a moment and then will
remain constantly illuminated.
The registration is now complete. You can now disconnect the
repeater and move it to the desired location. Disconnecting the
power will not delete the registration.
v. Verification Tone
Using Phones
A. If the base code has been changed, you must set it to "0000".
B. You must repeat the registration procedure even if the cordless
unit was already registered to the base station
Now the LED flashes very quickly without interruptions.
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