Troubleshooting
727
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., timeout
handling, 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. For more information, refer to 180 Ring
Workaround on page 321.
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. For more information, refer to 180 Ring
Workaround on page 321.
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. For more information on packet loss, refer to
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