Are VPN GW products able to notify the tunnel closing toward 3rd party box.

Hello,

I would like to implement a configuration like this:
PC[Appl.Client/VPN client]  <==VPN tunnel ==>VPN GW <-------->Appl.Server

application client <--> Appl.Server connection would run ontop of VPN tunnel 
transparently.

However Application Server would like to have at least the information from 
VPN GW when the tunnel is closed on per remote IP address level (to identify 
the PC). Do current VPN GW products in the market support this kind of 
notification toward 3rd party network elements? If yes, what is the 
mechanism used there?

Thanks, Son

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