Yealink SIP-T2 SERIES Administrator's Manual page 486

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
2. Select the desired value (1-3) from the pull-down list of DTMF Repetition.
3. Click Confirm to accept the change.
To configure the method of transmitting DTMF digits for IP call via phone user interface
(take SIP VP-T49G IP phones for example):
1. Tap ->Advanced (default password: admin) ->VC Accounts->SIP IP Call.
2. Tap the DTMF Type field and then tap the desired value in the pop-up dialog box.
3. Tap the DTMF Info Type field and then tap the desired value in the pop-up dialog
box.
4. Enter the desired value in the DTMF Payload Type(96-127) field.
5. Tap the Save soft key to accept the change.
Suppress DTMF display allows IP phones to suppress the display of DTMF digits during
an active call. DTMF digits are displayed as ―*‖ on the LCD screen. Suppress DTMF
display delay defines whether to display the DTMF digits for a short period of time
before displaying as ―*‖.
Procedure
Configuration changes can be performed using the configuration files or locally.
Configuration File
464
<y0000000000xx>.cfg
Configure suppress DTMF display
and suppress DTMF display delay.
Parameters:
features.dtmf.hide
features.dtmf.hide_delay