*** Moved to new post from https://vox.veritas.com/t5/NetBackup-Appliance/CALLHOME-status-Not-able-to-upload-callhome-data/m-p/... ***
Where is it calling home to? I mean is there a URL or IP address we can restrict it to?
Always best to start your own discussion with details of your specific environment. This post is nearly six years old and refers to an appliance model that reached end of support life in January 2017.
If you have a currently supported appliance, this link from the "Veritas NetBackup Appliance AutoSupport 2.0 Reference Guide" should give you the URL's you are after:
Hope this helps,