Hello, My 3CX server (IP 10.0.2.163) is configured, and works perfectly when used from the LAN. My router is a Cisco RV042G; the port forwarding (called uPnP on this model) is configured as follow : - port 5060 UDP&TCP forwarded to my 3CX server - port 5090 UDP&TCP forwarded to my 3CX server - ports 5000 & 5001 TCP forwarded to my 3CX server - ports 9000 to 9011 UDP forwarded to my 3CX server (range is limited to 9011 in 3CX config) - SIP ALG is disabled - UDP & TCP timeouts are set to 1800 However, when using it via 3CXPhone for Windows remotely, I can hear the remote person, but he cannot hear me (I checked the microphone settings, including with Skype, and it works). I run the Firewall Checker (with Windows Firewall disabled) and... nothing should work... I receive the answer "Failed - No response received or port mapping is closed. Port forwarding not configured correctly." for all ports (5060, 5090 and 9000 to 9011). I also used the Remote Firewall/NAT test utility (using STUN server), and I receive this answer : Trying to resolve address of proxy FQDN:'mydomain.com' Server IP has been resolved: 'myfixedIP:5060'->myfixedIP:5060 Start test, v.1.0.4 STUN resolution result: addr = mylocalIP:5091 Extension 601 is registered Calling *777 Connection with *777 established WARN:Contact port is not PBX port: 5060->56064 WARN:Audio connection IP not PBX IP: myfixedIP->10.0.2.163 What is port 56064 ?? What does "Audio connection IP not PBX IP" mean ?? Could you please help me to solve these issues ? Thanks in advance.