Yealink SIP-T2 SERIES Administrator's Manual page 490

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Example:
features.dtmf.transfer = 123
Note: It works only if the value of the parameter ―features.dtmf.replace_tran‖ is set to
1 (Enabled).
Web User Interface:
Features->General Information->Tran Send DTMF
Phone User Interface:
None
To configure transfer via DTMF via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of DTMF Replace Tran.
3. Enter the specified DTMF digits in the Tran Send DTMF field.
4. Click Confirm to accept the change.
Play local DTMF tone allows IP phones to play a local DTMF tone during an active call. If
this feature is enabled, you can hear the DTMF tone when pressing the IP phone's
keypad during a call.
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Parameters Permitted Values Default