Background: We have many customers' 3CX servers in the cloud. When manually registering extensions, we found that only one phone is registered, and other phones have failed to register (using UDP registration). At this time, we need to set up STUN server to solve this problem. How to set the STUN server manually By default the STUN server address is the 3CX server FQDN or IP address. Next, I will introduce how to set up STUN server for Fanvil, yealink and snom phones. Fanvil Phone: Log in to the phone's web interface on the browser. Go to Line - Basic Settings-STUN Settings, then enter the 3CX server address or IP, port number, default 5060. Yealink Phone: Log in to the phone's web interface on the browser. Go to Network - NAT-STUN, then enter the 3CX server address or IP, port number, default 5060. Go to the NAT option of the account-registration interface, and select STUN. Snom Phone: Log in to the phone's web interface on the browser. Go to Identity-NAT and enter the 3cx server address and port number.
Background: During the normal use of the phone, the user needs to enter the password when logging in to the web page of the phone or go to the advanced settings of the phone screen to complete the factory settings. The default password is admin. However, customers often forget the password after modification, which means that the factory settings cannot be restored. In this document, we will introduce How to perform a Forced Factory Reset on Fanvil and Yealink IP Phone. Applicable models: Yealink Phone: SIP VP-T49G , SIP-T48G , SIP-T46G , SIP-T42G , SIP-T41P ,SIP-T40P , SIP-T29G , SIP-T27G , SIP-T23G ,SIP-T23P , SIP-T21(P) E2 , SIP-T19(P) E2. Fanvil Phone: X3/3G, X4, X5/5S, X6 and H2S, H3, H5. Steps to force the factory reset of Yealink Phone: Press and hold the phone OK button for about 10 seconds (some models do not have an OK button on the phone panel, then press and hold the redail button of the phone). If the phone prompts you to restore the factory settings, press the confirmation button to restore the factory configuration. Steps to force the factory reset of Fanvil Phone: Turn off the device. Press and hold the "#" button and turn on the device. Exception for X5S: Press "#" immediately after the red light on the Page-Switch (PS) button flashes. Exception to X6: Press "#" immediately after the second red light flashes on the power indicator LED. The message "Post Mode" will appear on the screen. Once the “Post Mode” message appears, dial “*”, “#”, “1”, “6”, “8”. Wait 5 seconds until "Conf Rest" is displayed. After rebooting the device, the phone will be successfully reset.