Yealink T48G, Administrator'S Manual

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Troubleshooting
580
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Intermittent voice is mainly caused by packet loss, due to network congestion, and jitter, due to
message recombination of transmission or receiving equipment (for example, 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.
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
distance 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.