on invite you should be prompted to accept = yes or decline = no
with invite nick,msg,channel,server,time.

Copy and paste into your remotes and wait to be invited.

dialog rwi {
  title "Invited Notice"
  size 412 150 295 123
  button "Yes", 2, 187 93 50 25
  button "No", 3, 241 93 50 25, cancel
}
on *:DIALOG:rwi:sclick:2:{ scid $cid | join %invited }
on *:DIALOG:rwi:sclick:3:{ notice %invitenick SORRY but I am busy right now and i wont be joining %invited }
on *:invite:#:{
  BEEP 5 100
  if ($chan isin $nick) { join $chan | halt }
  if ($dialog(rwi)) { notice %invitenick SORRY but I am busy right now. }
  set %invited $chan
  set %invitenick $nick
  set %server $server
  set %time $time(hh:nn:ss TT)
  dialog -m rwi rwi
}