Yealink SIP-T4X Administrator's Manual page 103

To configure busy tone delay via web user interface:
1． Click on Features->General Information.
2． Select the desired value from the pull-down list of Busy Tone Delay (Seconds).
3． Click Confirm to accept the change.
Return code when refuse defines the return code and reason of the SIP response
message for call rejection. The caller's LCD screen displays the reason according to the
return code received. Available return codes and reasons are:
404 (Not found)

480 (Temporarily not available)

486 (Busy here)

Procedure
Return code for call rejection can be configured using the configuration files or locally.
Configuration File <y0000000000xx>.cfg
Configuring Basic Features
Navigate to:
http://<phoneIPAddress>/servlet
?p=features-general&q=load
Configure the return code when
refusing a call.
For more information, refer to
87