In EasyCall 2.1, Citrix introduced the very first Citrix virtual appliance.  Citrix will soon discontinue the EasyCall hardware appliances. Which means customers can download the EasyCall VA for free and run on top of XenServer express, which is also free!  Login is requred at  “>http://www.citrix.com/English/ss/downloads/results.asp?productID=683164

Some bullet points..

First Citrix virtual appliance
Simplified evaluation and demonstration
Based on XenServer 5
Reduced deployment and management costs
Increased capacity
Failover
Multiple Gateway Administration
Capacity for large customers