Wait handling is mandatory, not optional
Every queue requires an overflow destination and a destination for when no agent is logged in. You cannot save a queue that drops a caller into silence.
- Hold music, and announcements for position in line or expected wait
- A maximum wait and a maximum number of waiting callers
- An overflow destination, required, defaulting to the site voicemail box
- A separate destination for when nobody is logged in, which is a different failure from being busy