Yealink SIP-T2 Series, Administrator'S Manual

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Troubleshooting
887

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.
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 332 .
Ensure that the 180 ring workaround feature is disabled. For more information, refer to
180 Ring Workaround on page 332 .

Ensure that the display device has suitable resolution.

Check whether the packet has been lost. For more information on packet loss, refer
to
Getting Information from Talk Statistics on page 878 .

Ensure that camera settings are configured correctly, such as brightness and white
balance.

Avoid high-intensity indoor light or direct sunlight on the camera.

Ensure that the IP phone is powered off.

Check if the camera is not properly connected to the phone.

Make sure that the shutter switch of the camera is opened.

Replace the camera.