User Manual

Yealink Skype for Business HD IP Phones Administrator Guide
372
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 PC 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 Skype for Business 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 215.
Why does the Skype for Business 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 215.
Bluetooth Issues
Why can’t I connect the Bluetooth device with my phone all the time?
Try to delete the registration information of the Bluetooth device on both phone and Bluetooth
device, and then pair and connect it again. Contact Yealink field application engineer and your
Bluetooth device manufacturer for more information.
Why does the Bluetooth headset affect the phone’s voice quality？
You may not experience the best voice quality if you use a Bluetooth headset while the 2.4 GHz
band is enabled or while you are in an environment with many other Bluetooth devices. This
possible loss in voice quality is due to inherent limitations with Bluetooth technology.