Yealink SIP-T54S Administrator's Manual page 859

Parameters
Web User Interface:
Settings->Ring->Internal Ringer Text
Phone User Interface:
None
distinctive_ring_tones.alert_info.X.ringer
(X ranges from 1 to 10)
Description:
Configures the desired ring tones for each internal ringer text.
The value ranges from 1 to 10, the digit stands for the appropriate ring tone.
1-Ring1.wav
2-Ring2.wav
3-Ring3.wav
4-Ring4.wav
5-Ring5.wav
6-Ring6.wav
7-Ring7.wav
8-Ring8.wav
9-Silent.wav
10-Splash.wav
Web User Interface:
Settings->Ring->Internal Ringer File
Phone User Interface:
None
To configure distinctive ring tones via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Configuring Audio Features
Permitted Values
Integer from 1 to 10
Default
1
833