Troubleshooting Solutions
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l Users are seated too far out of recommended microphone range and sound faint, or are seated too close to sens-
itive microphones and cause echo.
l Intermittent voice is mainly caused by packet loss, due to network congestion, and jitter, due to message recom-
bination of transmission or receiving equipment (for example, timeout handling, retransmission mechanism, buf-
fer underrun).
l Noisy equipment, such as a computer or a fan, may cause voice interference. Turn off any noisy equipment.
l Line issues can also cause this problem; disconnect the old line and redial the call to ensure another line may
provide a better connection.
There is 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.
Related Topic
Early Media
Play the local ringback tone instead of media when placing a long-dis-
tance number without plus 0
Ensure that the 180 ring workaround feature is disabled.
Related Topic
Early Media
Wi-Fi and Bluetooth Issues
The wireless signal strength is low
Ensure the IP phone and your gateway/ router are within the working range and there is no obvious interference
(walls, doors, and so on.) between them.
The phone cannot connect to Bluetooth devices all the time
Try to delete the registration information of the Bluetooth device on both IP phone and Bluetooth device, and then
pair and connect it again. Contact Yealink field application engineer and your Bluetooth device manufacturer for
more information.
The Bluetooth headset affects IP 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.
Firmware and Upgrading Issues
Fail to upgrade the phone firmware
Do one of the following:
l Ensure that the target firmware is not the same as the current firmware.
l Ensure that the target firmware is applicable to the IP phone model.
l Ensure that the current or the target firmware is not protected.
l Ensure that the power is on and the network is available in the process of upgrading.
l Ensure that the web browser is not closed or refreshed when upgrading firmware via the web user interface.
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