in voicemail pro create a new user variable.
in between the start point and the check digits add a test user variable action.
in the specific tab select the variable you created and in the "...matches the value below" put open
connect the true result to the check digits action.
connect the false action to a disconnect action and record a prompt on the disconnect saying sorry conference is closed.
create a new shortcode in VMpro named conferencestatus or whatever
connect the start point to a menu with touchtones 1 and 2 selected. in the menu record a prompt. "press 1 to mark conference open, or 2 to mark the conference as closed.
create a set user variuable action. link it to menu result 1. in the specific tab select the variable you created and in the "...with the following value" box type open.
create another set user variable action and link it to menu result 2. same process but "...with the following value closed"
i would hang a disconnect action off the back of each set user variable action say "you have set the conference as open" or closed, so they know that they have made the selection they want
in manager create a shortcode *55 or whatever is free.
code:*55
feature:voicemail node
telephone number:conferencestatus
done.
dial *55 or your shortcode.
press one to mark the conference as open and it will work as it does now.
press 2 and it will be closed and when anyone dials in they will get the prompt you recorded on the disconnect action.
phew!
Never argue with an idiot. bystanders won't be able to tell the difference.