Someone know to reset this phone?

Asterisk Asterisk Endpoints
1

I need to reset this phone for use with asterisk. I have tried to press button on base and then “register” on phone, but nothing. In the manual they said to click
the button on base but nothing happen.

https://www.documents.philips.com/assets/20231127/3db9d0adcec47b68b08b0c7004c23bc.pdf

They also said
“Select [SERVICES] > [UNREGISTER],”

but there is not “unregister” menu, only register.

2

Solution found.

First ensure the cable work (i had lucky two identical cable, otherwise bye…)
Turn on the phone
Touch the “sound” button in the bottom of the base of telephone
Open menu on phone and click register
After 5 seconds the phone is ready and “free” from dect.