Yealink SIP-T54S Administrator's Manual page 324

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Description:
Enables or disables the IP phone to play a key tone when a user presses a send key.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), the IP phone will play a key tone when a user presses a send key.
Note: It works only if the value of the parameter "features.key_tone" is set to 1 (Enabled).
Web User Interface:
Features->Audio->Send Tone
Phone User Interface:
None
features.send_pound_key
Description:
Enables or disables the IP phone not to send any pound key when pressing double #.
0-Disabled (Send one pound key by pressing double #)
1-Enabled (Do not send any pound key when pressing double #)
Note: It works only if the value of the parameter "features.key_as_send" is set to 1 (Enabled).
Web User Interface:
Features->General Information->Send Pound Key
Phone User Interface:
None
To configure a send key via web user interface:
Click on Features->General Information.
1.
Select the desired value from the pull-down list of Key As Send.
2.
Click Confirm to accept the change.
3.
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Parameters Permitted Values Default
0 or 1 0