There are several places where people press 0 or are prompted to speak to an operator in BVoIP's Cloud PBX powered by 3CX. The challange however is that you only have the ability to set one default operator extension for the entire phone system. Here is a tip on how to work around that limitation.
1. Create a dummy extension(unregistered) setting the alias in SIP ID as "0". Then under Forwarding Rules tab of this extension, forward all calls to any extension, ring group, or call queue that you want.