Yealink SIP-T38G, Руководство администратора

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Troubleshooting
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Ensure that the switch or hub in your network is operational.
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The phone LCD screen prompts ―No Service‖ message when there is no any available
SIP account on the IP phone.
Do one of the followings:

Confirm if any account is actively registered on the IP phone at the path
Menu->Status->More->Accounts.

Check if the SIP parameters of the account have been set up correctly.
Press the OK key when the IP phone is idle to check the basic information of the IP phone,
such as IP address and firmware version.
Do one of the followings:

Ensure that the target firmware is not the same as the current used firmware.

Ensure that the target firmware is applicable to the IP phone model.

Ensure that the current or the target firmware is not protected.

Ensure that the power is on and the network is available in the process of
upgrading.

Ensure the web browser is not closed and refreshed when upgrading the firmware
using the web user interface.
Check if you have configured your phone to obtain the time and date from the NTP
server automatically. If your phone is unable to access the NTP server, configure the time
and date manually.
During a call, you may experience poor audio, including intermittent voice, low volume,
echo or other noise. The root cause of audio anomalies can be difficult to diagnose.

Problems may occur simply because the users are seated too far out of
recommended microphone range and sound faint, or are seated too close to