Yealink SIP-T48G Administrator's Manual page 556

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
able to download the CFG files from the provisioning server. PnP depends on support
from a SIP server.
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Do one of the following:
Ensure that the configuration is set correctly.

Reboot the phone. Some configurations require a reboot to take effect.

Ensure that the configuration is applicable to the IP phone model.

The configuration may depend on support from a server.

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They are codes that the IP phone sends to the server when a certain action takes place.
On code is used to activate a feature on the server side, while off code is used to
deactivate a feature on the server side.
For example, if you set the Always Forward on code to be *78 (may vary on different
servers), and the target number to be 201. When you enable Always Forward on the IP
phone, the IP phone sends *78201 to the server, and then the server will enable Always
Forward feature on the server side, hence being able to get the right status of the
extension.
For anonymous call/anonymous call rejection feature, the phone will send either the on
code or off code to the server according to the value of Send Anonymous Code/Send
Rejection Code. For more information, refer to
Anonymous Call Rejection
Do one of the following:
Reset another available IP address for the IP phone.

Check network configuration via phone user interface at the path

Menu->Settings->Advanced Settings->Network->WAN Port->IPv4 (or IPv6). If the
Static IP is selected, select DHCP instead.
Reset your phone to factory configurations after you have tried all troubleshooting
suggestions but do not solve the problem. Note that all custom settings will be
overwritten after resetting.
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on page 177.
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Anonymous Call on page 172 and