Hi Guys, I setup an external extension on our SPA941 connecting to our 3CX IP PBX. It connected to our 3CX but the problem is when external extension calls our internal extension, I can hear the voice of our external ext but the caller cannot hear my voice. And I cannot dial our external extension from our internal ext. Also on the Phone Status under SIP tab on our SPA941 external ext has no RTP Packets detected. Anybody can help please? Thanks!