Will the Windows XP dialup VPN client work with the RF550VPN?

No, Windows XP dialup VPN client will not work with RF550VPN.

However, we do have another model (RF660VPN) that supports the Windows XP dialup VPN client using PPTP. For information about this product, please go to our Web site at:

http://www.multitech.com/en_US/SUPPORT/Families/RouteFinder/