MWI for General delivery mailbox

Hi !!
I just have a little problem with the MWI for the General delivery mailbox .
In fact i have 3 ephone-dn in a hunt group :

ephone-hunt 1 peer
pilot 120 secondary 0298......
list 100, 101, 103
final 888
timeout 15, 15, 15
no-reg both

I have no problem to switch on the MWI for the ephone-dn :

ephone-dn 20
number 8000... no-reg both
mwi on
!
!
ephone-dn 21
number 8001... no-reg both
mwi off

But I don't know how to switch on MWI for the General delivery mailbox .

I read that in a cisco documentation :

When a caller leaves a message in this mailbox, no MWI is turned on.

Is it possible to switch it on where there is a message in ?

Thanks a lot.

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