Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Parameters
Permitted Values
Default
Description:
Enables or disables the IP phone to display the DTMF digits for a short period before
displaying asterisks during an active call.
0-Disabled
1-Enabled
Note: It works only if the value of the parameter “features.dtmf.hide” is set to 1 (Enabled).
Web User Interface:
Features->General Information->Suppress DTMF Display Delay
Phone User Interface:
None
To configure suppress DTMF display and suppress DTMF display delay via web user
interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Suppress DTMF Display.
3. Select the desired value from the pull-down list of Suppress DTMF Display Delay.
4. Click Confirm to accept the change.
Transfer via DTMF
Call transfer is implemented via DTMF on some traditional servers. The IP phone sends
specified DTMF digits to the server for transferring calls to third parties.