hi spacehammer or honest1
This connection from remote Cisco 2801 to the 2811 at head office is transparent?
As test Can You Ping eg. computers on Head site from Remote Site ?? an other ports?? Have access to the Internet??? via Your i thin VPN - frame-relay connection.
When Yes - that is nothing to configure in Cisco routers.
Possible is that in EventLog on your Citrix server is information that this remote computers cannot issue Client License from Microsoft Terminal Services process on Citrix Server.
If yes
That possible is so you must at some time open port on firewall to the rdp Connection to the Citrix port 3389 and start connect once from remote PC-s to this server via RDP (You become this License), and than via Citrix Client.
If you have distributing only Citrix Desktop that opened port on firewall 1494 is ok, but if you wish distributing application from Citrix You must have UDP browser from Citrix to open on port 1604