...
There are two types of callbacks, Public and Private.
Set Private Callback
When a lead is dispositioned with the action of Set Private Callback, an additional dialogue box will prompt the user to select the type of callback, select the date and time of callback, and to add an additional note.
...
Add any additional notes for the next representative that will be calling the lead should know.
Setting Public Callbacks
Public callbacks will prompt any user working from that specific campaign the lead with the disposition was added to is in.
...