Matrix SPARSH VP710, User Manual

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738 Matrix SPARSH VP710 User Guide
specific phone. A remote phone book is always used as a central phone book for a company; each employee can
load it to obtain the real-time data from the same server.
Audio Issues
How to increase or decrease the volume?
Press the Volume key to increase or decrease the ringer volume when the IP phone is idle or when there is an
incoming call arrives on the phone, to adjust the volume of engaged audio device (handset, speakerphone or
headset) when there is an active call in progress, or to adjust the media volume when the phone is not on the idle
screen.
Why do I get poor sound quality during a call?
If you have poor sound quality/acoustics like intermittent voice, low volume, echo or other noises, the possible
reasons could be:
• Users are seated too far out of recommended microphone range and sound faint, or are seated too close
to sensitive microphones and cause echo.
• Intermittent voice is mainly caused by packet loss, due to network congestion, and jitter, due to message
recombination of transmission or receiving equipment (e.g., timeouthandling, retransmission mechanism,
buffer under run).
• Noisy equipment, such as a computer or a fan, may cause voice interference. Turn off any noisy
equipment.
• Line issues can also cause this problem; disconnect the old line and redial the call to ensure another 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 party picks up the call, the
possible reason could be: the phone cannot send the real-time transport protocol (RTP) streams, in which audio
data is transmitted, to the connected call. Try to disable the
“180 Ring Workaround” feature.
Why does the IP phone play the local ringback tone instead of media when placing a long distance number
without plus 0?
Ensure that the “180 Ring Workaround” feature is disabled.
Camera and Video Issues
Why is the video quality bad?
• Ensure that the display device has suitable resolution.
• Check whether the packet has been lost.
• 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 when you 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 local camera?
If the camera lens is oily or soiled, there may be some dazzle light on the images. Please try to clean it up.