Hi I am getting problems on setup remote extension with Cisco SPA303. Problems:- 1. Remote extension cannot receive call but able to call outsider and other extension 2. No voices on both sides (caller and receiver) Log results:- 1.Call to sip:xxx(reomte extension)@192.168.xxx.xx (server internal IP) has failed; Cause: 408 Request Timeout; internal 2.No RTP packets were received:remoteAddr=192.168.xxx.xxx:16472(SPS303 local IP),extAddr=0.0.0.0:0,localAddr=192.168.xx.xx:8010(server internal IP) I am working on 3CX phone system version 10, 1 PSTN and Skype connect, assuming all related ports: 5060,5090,8000,9000 had been opened on both routers. Please help and advise if there is something I missed on setup.