Yealink SIP-T48G Administrator's Manual page 264

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Web User Interface:
Features->Audio->Call Waiting Tone
Phone User Interface:
Menu->Features->Call Waiting->Play Tone
call_waiting.on_code
Description:
Configures the call waiting on code to activate the server-side call waiting feature.
The IP phone will send the call waiting on code to the server when you activate call
waiting feature on the IP phone.
Example:
call_waiting.on_code = *71
Web User Interface:
Features->General Information->Call Waiting On Code
Phone User Interface:
Menu->Features->Call Waiting->On Code
call_waiting.off_code
Description:
Configures the call waiting off code to deactivate the server-side call waiting
feature. The IP phone will send the call waiting off code to the server when you
deactivate call waiting feature on the IP phone.
Example:
call_waiting.off_code = *72
Web User Interface:
Features->General Information->Call Waiting Off Code
Phone User Interface:
Menu->Features->Call Waiting->Off Code
To configure call waiting via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Call Waiting.
3. (Optional.) Enter the call waiting on code in the Call Waiting On Code field.
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Parameters Permitted Values
String within 32 characters
String within 32 characters
Default
Blank
Blank