What Windows CE-compatible VPN client would you recommend using to connect to a Nortal VPN switch?

I would like to know your opinion on the following. I have been working in the mobile CRM arena. The company I'm working for as a corporate LAN, in which a CRM server lies. I need to be able to perform remote access connections from my handheld (running Windows CE) to that LAN, by using VPN connectivity.

This corporation is running Nortel Contivity VPN routers to allow VPN LAN connectivity. I sincerely haven't heard of any Nortel VPN client for Windows CE. Do you know if it would be possible to use some other kind of VPN client to connect to a Nortel VPN switch?