Those who are still using the crack or beta version of Core4VoIP Billing can get the license copy of Core4VoIP Billing with $500.
With license copy you will get free sub-domain under core4voip.net [yourbrandname.core4voip.net] which is fully comes with SSL certificate [https://yourbrandname.core4voip.net]. https is a such protocol which is completely secure and encrypted.
Check the license of your Core4VoIP Billing by the below link entering the IP address of your server.
