Problem in script mounting volume on VPN-server

Question

Hi,
I try to set up the app Chronosync to make a regular backup on a disc volume that is at the University.
Chronosync can be told to backup at certain times, but the folder/volume needs to be mounted.
Chronosync can start an applescript to do this automated.
I made a script that opens the VPN, but I fail to get it to mount the specific volume on the server.
This is what I have so far:
tell application "System Events"
          tell current location of network preferences
                    set VPNservice to service "***"  --replace asterix by name of VPN-server
                    set isConnected to connected of current configuration of VPNservice
                    tell application "System Events" to tell process VPNservice to activate
                    if not isConnected then
  connect VPNservice
                              delay 1
                              tell application "System Events" to tell process VPNservice to keystroke "******" --replace asterix by password
                              tell application "System Events" to tell process VPNservice to keystroke return
                    end if
          end tell
end tell
This opens the vpn connection, and from there it should be just mounting the personal volume on the university's server.
Actually it looks fairly simple to do: Finder > Go > connect to server > click smb://***** and off you are.
But I just don't get this last piece working.
Help is very welcome!

Answer 1

I managed to get a step further and have the script working - that is to say in Applescript. But when I start the script in Chronosync it will not perform the second action, mounting the volume.
Why would that be??
tell application "System Events" 
          tell current location of network preferences
                    set VPNservice to service "VPN***"
                    set isConnected to connected of current configuration of VPNservice
                    tell application "System Events" to tell process VPNservice to activate
                    if not isConnected then
  connect VPNservice
                              delay 1
                              tell application "System Events" to tell process VPNservice to keystroke "--password"
                              tell application "System Events" to tell process VPNservice to keystroke return
                    end if
          end tell
end tell
delay 4
tell application "Finder" to open location "smb://username:password@servername/username"