Why is the video quality bad on my Yealink VC400 Conference System?
If the video quality is poor, ensure that the display device has a suitable resolution. Check whether packets have been lost. Also, verify that the camera settings, such as brightness and white balance, are configured correctly. Avoid high-intensity indoor light or direct sunlight on the camera.
Why is the screen black on my Yealink VC400?
If the display device is black, verify that it's properly connected to the VC400/VC120 codec. Ensure the system isn't in sleep mode by pressing any key on the video conferencing phone or remote. Also, check if the display device itself is in sleep mode or turned off, and try switching the video input source to the correct one.
Why won't my Yealink VC400 call the far site?
If the system fails to call the far site, check the network availability of both the near and far sites. Verify that the far site hasn't enabled the DND (Do Not Disturb) feature. Ensure accounts are correctly registered and the appropriate account is used for the call. Confirm the number you're calling is correct and that the far site isn't rejecting your call. Check if a firewall is blocking inbound traffic, if the far site has reached its call-in limit, if encryption settings are compatible, and if both sites support the same call protocol.
Why is my Yealink Conference System remote control not working?
If the remote control isn’t working, first ensure the system is powered on. Then, check the battery polarity (+/-) and ensure the battery has sufficient power. Finally, make sure there are no special fluorescent or neon signs nearby that might interfere with the remote's signal.
Why can't I hear audio during calls on my Yealink Conference System?
If you can't hear audio during a call, first ensure that the local audio output device is correctly connected. Next, use the audio diagnose feature to check if the audio device is working normally. Also, verify that the ringer volume isn't set to the minimum and that the far site isn't muted.
Why does my Yealink Conference System fail to call the far site?
If your system fails to call the far site, verify the network availability of both the local and far sites. Also, check if the far site has enabled the DND (Do Not Disturb) feature or has reached its maximum call-in limitation. Ensure the accounts are registered correctly and that the system uses the appropriate account to call the far site, and confirm that the number you're calling is correct. Also, verify that the far site isn't rejecting your call and that the firewall isn't blocking inbound traffic from the other site. If your local site uses encryption, ensure the far site enables encryption, too. Finally, ensure that the far site supports the same call protocol as the local site.
Why does the far-site display a black screen when I start a presentation on my Yealink VC400 Conference System?
If the far site displays a black screen when you start a presentation, you can disable the network adaptive feature. This will force the system to send packets to the negotiated address rather than the actual address.
Why is the display device black on my Yealink VC400 Conference System?
If the display device is black, check the connection between the display device and the VC400/VC120 Codec. It may also be that the system or the display device is in sleep mode. Press any key on the video conferencing phone or the remote control to resume system operation or press the power button on the remote control or on the display device. Also, verify that you have selected the correct video input source; try switching the video input source.
How to fix incorrect time and date on my Yealink VC400 display?
If the display device doesn't show the correct time and date, and the system is set to obtain them automatically from an NTP server, verify that the SNTP server and time zone are correctly configured and that the connection between the system and the NTP server is working. If the time and date are configured manually, ensure they are set correctly.
Why can't the far site hear the local audio from my Yealink VC400 Conference System?
If the far site can't hear the local audio, ensure that the local audio input device is connected correctly. Check if the near site is muted, and also check whether the system has enabled the auto answer mute or auto dialout mute feature.
General| Optical zoom | 18 x |
|---|---|
| White balance | Auto, Indoor, Outdoor |
| Focus adjustment | Auto |
| Video codecs | H.264, H.264, H.263 |
| Supported video modes | 1080p |
| Supported graphics resolutions | 352 x 288, 704 x 576, 1280 x 720 (HD 720), 1920 x 1080 (HD 1080) |
| Voice codecs | G.711, G.711a, G.722 |
| Line-in | Yes |
| USB 2.0 ports quantity | USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them. |
| ITU-supported standards | H.323 |
| Ethernet LAN data rates | 10, 100, 1000 Mbit/s |
| AC input voltage | 100-240 V |
| Power consumption (max) | 30 W |
Weight and Dimensions| Depth | 183 mm |
|---|---|
| Width | 330 mm |
| Height | 40 mm |
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