are you asking for this
ext 1 has nupoint voicemailbox
ext 2 doesn't
both are diverted to the voicemail and you want calls from ext 2 to leave messages in ext 1 mailbox?
if so then yes
you need to open the nupoint blade ,s elect mailboxes , select ext 1
set the display to advanced and add ext2 as an associated extension( you can have 4)
If I never did anything I'd never done before , I'd never do anything.....