Thought I'd share some issues I'd been having and how I fixed them. The first was the call not ending. http://www.3cx.com/forums/patton-sn4114-in-the-uk-not-disconecting-calls-fix-3627.html explains how to fix this. The other issue was the line was silent when a call came in. To fix this, go Lines > Manage > Patton > Gateway Capabilities and set "Supports Replace to disabled.