ADC (NetScaler) sometimes fail to perform well because of software or hardware issues. In such cases, Citrix must collect data and resolve issues before a potential impact can occur at the customer site. By enabling Call Home on your appliance, you can automate the error notification process. Not only you avoid having to call Citrix support service, raise a service request, and upload system data before support team can troubleshoot the issue, but Citrix support can often identify and address the issue before they occur. Call Home periodically monitors the appliance and automatically uploads data to the Citrix support server.
By default, Call Home is enabled on all platforms and all flavors of ADC (MPX, VPX, SDX). By having this feature enabled, you allow Citrix to collect ADC deployment and usage details for better implementation, and support service.