As an example, is there a way to have it end all calls to an extension that are 7, 10, or 11 digits long?I want internal extensions to be allowed to call these extensions, I don't want an external caller to be able to call the main number, and dial by extension to these specific extensions at the digital receptionist.



Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.