Well 3CX recommended a user having 2 extensions in the latest Alpha as a work around to e911 issues. https://www.3cx.com/community/threa...responds-with-emergency-number-options.70962/ (Post 11.what is the purpose of this ? why create 2 extensions for 1 user ?
3CX don't see a difference between user and extension : an extension is a user and vice et versa.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.