I've setup a Vegastream 8FXO successfully with 3CX. The issue I am having with it is: If I call in once and hang up the call doesn't disconnect so the phones will keep on ringing for 20ish seconds. If a call goes into voicemail 3CX/vegastream keeps that line open on 999 until I manually go in and disconnect it. I don't think it is getting the disconnection signal or something? Any light on this topic?