BLF mobile extensions

my goal is to know from my ip phone if a colleague who uses a mobile softphone is registered or reachable.

for the call status everything is OK, BLF turns on the LEDs and flashes as expected.
with the command “sip show subscriptions” I see in “Last state” the value “Unavailable” for extensions not reachable while the others are “Idle”.

on my ip phone, SNOM D725, set the keys with BLF, but all extensions are “Idle”, I cannot get the value “Unavailable” that Asterisk knows.

My knowledge of Asterisk is limited, I have covered various options, such as XML Definition on SNOM to castomize the behavior of my ip phone.
Does anyone have a suggestion?

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