Change the voicemail massage

i want to change the voicemail massage and i try from ( music and hold )
and from the voicemail option > but i cant
and i want to configure the email notification when incoming voicemail
and i’m using FreePBX >>>

please to help me

HI ,

I have Asterisk system used for messaging purpose. So for our off office hours all the calls to be send to Asterisk voicemail.
I made setup to for this and working fine.
Can anyone help me how to activate silent before beep sound instead of “extension is not available” so the caller will only a beep sound.