I am testing out 3CX with the 2 user version and Cisco 7940 phone running SIP 3-8-12. I can call from one extension to the other, but I can not Park the call using *0. Maybe I am doing something wrong; currently using a Cisco Call Manager system that has a Park button on the phones. I know that the *60 & *61 work for DND Off/On, so the Dial Codes work. What am I missing here?