Overview Misc Destinations allow you to use anything you could dial from a standard extension as a destination.
Example You might want to have an IVR option that is 'If you want to speak to rob, you can connect to his mobile by pushing 2', and having a Misc Destination of
* Rob's Mobile
* 00402077155 (Note the leading 0, as that's what I use for an 'external' call)
Then in the IVR menu, you simply select 'Rob's Mobile' as a destination, and it will connect the caller through.