This would be a windows application that associates an application with a network interface. Routing all data from that application through that network interface. This would only really be useful when connecting to vpns. Certain applications could be forced not to use the vpn connection, so they wouldn't lose connectivity when a vpn connection is made.
Asterisk callout voicemail
This would be an asterisk script or external AGI that when a voicemail is recieved it dials out a phone number associated with that extension, reads out caller information and plays the voicemail message.