The Connect on Demand feature provided by Mobile Connect provides the ability to automatically establish a VPN connection when you attempt to access a domain on the private network. To support Connect on Demand, a VPN connection should not request any user interaction. This provides a seamless VPN connectivity experience without the need to manually launch Mobile Connect.
Connect on Demand is only available for connections to SMA 1000 Series and SMA 100 Series.
See the following: