Yealink SIP-T48G Administrator's Manual page 310

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
Parameters
Description:
Customizes the tone when the IP phone receives a text message or voice message.
The value format is Freq/Duration. For more information on the value format, refer to
the parameter "voice.tone.dial".
Note: It works only if the parameter "voice.tone.country" is set to Custom.
Web User Interface:
Settings->Tones->Message
Phone User Interface:
None
voice.tone.autoanswer
Description:
Customizes the warning tone for auto answer.
The value format is Freq/Duration. For more information on the value format, refer to
the parameter "voice.tone.dial".
Note: It works only if the parameter "voice.tone.country" is set to Custom.
Web User Interface:
Settings->Tones->Auto Answer
Phone User Interface:
None
To configure tones via web user interface:
1. Click on Settings->Tones.
2. Select the desired type from the pull-down list of Select Country.
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Permitted Values
String
Default
Blank