IPSEC from Nortel contivity to Juniper netscreen

I was having difficulties in getting an IPSEC tunnel shifted from a Cisco VPN Concentrator onto a Nortel Contivity router . Well it turned out that there were lots of options that needed to be changed with respect to the encryption settings in the Contivity.The default settings for each manufacturer is quite different.Anyway I got a document to configure the tunnel to a Juniper Netscreen (That was the other endpoint) from a Nortel Contivity device and once the settings were done , it worked fine.
I was also able to configure a User tunnel on the Contivity .It was rather simple , I just created a user account in the profiles -> users section of the gui for it and then assigned a IP address pool for the user and lo that did it.The connection was established . Then I had to open the firewall rules for people accessing the network through the tunnel.