Yealink SIP-T21 - Manual (Page 71)

Customizing Your Phone
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For multiple numbers, enter a comma between every two emergency numbers. The
default emergency numbers are 110, 911 and 120.
3. Click Confirm to accept the change.
Note
You can enable live dialpad on the SIP-T21P/SIP-T21 IP phone, which enables the IP
phone to automatically dial out the phone number without pressing the send key. You
can also configure a delay, where the phone will dial out the phone number
automatically after the specified period of time.
To enable live dialpad via web user interface:
1. Click on Settings->Preference.
2. Select Enabled from the pull-down list of Live Dialpad.
Emergency number is configurable via web user interface only.