Troubleshooting749noisy equipment. Line issues can also cause this problem; disconnect the old line and redial the call to ensureanother line may provide better connection.Why is there no sound when the other party picks up the call?If the caller and receiver cannot hear anything - there is no sound at all when the other partypicks up the call, the possible reason could be: the phone cannot send the real-time transportprotocol (RTP) streams, in which audio data is transmitted, to the connected call.Try to disable the 180 ring workaround feature. For more information, refer to 180 RingWorkaround on page 329.Why does the IP phone play the local ringback tone instead of mediawhen placing a long distance number without plus 0?Ensure that the 180 ring workaround feature is disabled. For more information, refer to 180 RingWorkaround on page 329.Camera and Video IssuesWhy is the video quality bad? Ensure that the display device has suitable resolution. Check whether the packet has been lost. For more information on packet loss, refer toGetting Information from Talk Statistics on page 742. Ensure that camera settings are configured correctly, such as brightness and white balance. Avoid high-intensity indoor light or direct sunlight on the camera.Why can’t I preview local camera when the phone is idle?If the camera is properly connected to the IP phone but there are no images on the screen whenyou launch Camera application or swipe down from the top of the screen and then tap Video,you may need to replace the camera.Why is there some dazzle light on the images when previewing the localcamera?If the camera lens is oily or soiled, there may be some dazzle light on the images. Please try toclean it up.
