Anyone ever managed to get the BlackBerry's IPSEC VPN client to talk to a Mikrotik?

At least on the BB I'm looking at, running OS5, it looks like a giant PITA. The Blackberry has a bunch of different IPSEC VPN concentrator vendors listed -- Cisco, Avaya, Nortel, etc.. You select the vendor of the concentrator you talk with, then can select a bunch of parameters based on which vendor you select. So, the idea is to find a "vanilla" concentrator vendor that is easiest for the Mikrotik to emulate. But I haven't had much luck in that department.