Yealink SIP-T3 Administrator's Manual page 534

For CP920 phones:
http://10.3.20.10/servlet?key=F1;OK;F3;DOWN;DOWN;DOWN;OK;OK.
For other phones:
http://10.3.20.10/servlet?key=F1;F3;DOWN;DOWN;DOWN;OK;OK.
Note
: The variable value is not applicable to all events. For example, the variable value "MUTE" is only applicable when the
IP phone is during a call.
When authentication is required, you can use the following URI format: http(s)://user-
name:password@<phoneIPAddress>/servlet?key=variable value. If you are using a browser, we recommend that
you use Firefox.
The following table lists predefined variable values:
Variable Value
OK
ENTER
SPEAKER
F_TRANSFER
VOLUME_UP
VOLUME_DOWN
MUTE
F_HOLD/HOLD
F_CONFERENCE
Cancel/CANCEL
X
0-9/*/POUND
L1-LX
[1]
LX_LONGPRESS
BACK_IDLE
F1-F4
MSG
HEADSET
RD
Press the OK/√/ key. (not applicable to T57W/CP925/CP935W
phones)
Press the Enter soft key. (not applicable to T57W/T48U/T48S/T48G
phones)
Press the Speakerphone key. (not applicable to
CP920/CP925/CP935W phones)
Transfer a call to another party.
Increase the volume.
Decrease volume.
Mute a call.
Place an active call on hold.
Press the Conf/Conference soft key.
Cancel actions, reject incoming calls or end a call.
Cancel actions, reject incoming calls or mute or un-mute calls. (not
applicable to T57W phones)
Press the keypad (0-9, * or #)(not applicable to CP925/CP935W
phones).
Press the line keys (for T57W/T48U/T48S/T48G, X=29; for
T54W/T46U/T46S/T46G/T29G, X=27; for
T42U/T42G/T42S/T41P/T41S, X=15; for
T53W/T53/T53C/T43U/T27G, X=21; for T33P/T33G, X=12; for
T40P/T40G/T23P/T23G, X=3; for T31P/T31G/T31/T21(P) E2, X=2; for
CP925/CP935W, X=30).
Perform a corresponding action when long pressing line key X.
Return idle screen directly.
Press the soft keys.
Press the MESSAGE key. (not applicable to CP920/CP925/CP935W
phones)
Press the HEADSET key. (not applicable to CP920/CP925/CP935W
phones)
Press the RD/Redial key (not applicable to CP920/CP925/CP935W
Advanced Features
Phone Action
528