Yealink SIP-T4U Series

Advanced Features
478
Variable Value Phone Action
Cancel/CANCEL Cancel actions, reject incoming calls or end a call.
X
Cancel actions, reject incoming calls or mute or un-mute calls. (not
applicable to T57W phones)
0-9/*/POUND Press the keypad (0-9, * or #).
L1-LX
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/T43U/T27G,
X=21; for T40P/T40G/T23P/T23G, X=3; for T21(P) E2, X=2).
LX_LONGPRESS
[1]
Perform a corresponding action when long pressing line key X.
BACK_IDLE Return idle screen directly.
F1-F4 Press the soft keys.
MSG Press the MESSAGE key. (not applicable to CP920 phones)
HEADSET Press the HEADSET key. (not applicable to CP920 phones)
RD Press the RD/Redial key (not applicable to CP920 phones).
UP/DOWN/LEFT/RIGHT Press the navigation keys. (not applicable to T57W phones)
Reboot Reboot the phone.
AutoP Perform auto provisioning.
DNDOn
Activate the DND feature.
Note: It works only if “features.dnd.allow” is set to 1 (Enabled).
DNDOff
Deactivate the DND feature.
Note: It works only if “features.dnd.allow” is set to 1 (Enabled).
number=xxx&outgoing_uri=y
Place a call to xxx from SIP URI y.
Example: http://10.3.20.10/servlet?key=number=1234&outgoing_uri-
i=1006@10.2.1.48 (1234 means the number you dial out;
1006@10.2.1.48 means the SIP URL you dial from.)
OFFHOOK
Pick up the handset. (not applicable to CP920 phones)
Press the off-hook key. (only applicable to CP920 phones)
ONHOOK
Hang up the handset (not applicable to CP920 phones).
Press the on-hook key. (only applicable to CP920 phones)
ANSWER/ASW/Asw Answer a call.
Reset Reset a phone.
ATrans=xxx Perform a semi-attended/attended transfer to xxx.
ATrans=callid_A@callid_B
Join any two call parties together on the phone using the call-id. After
the call is set up, the two parties disconnect with the phone.
Scene: