[cisco-voip] Forward calls to Unity when device gets Unregistered

[Anthony Kouloglou]

Hi all,
is there a way for a call manager to be aware of the state of one phone, 
so it can forward the calls to Unity -voice mail.
In that case , when someone logs in to the device with extension 
mobility, and the old device/number does not exist, it can forward the 
calls to Voice mail.

Thanks