No DTMF with stock dialer?

Recently I have called certain customer care service center and had to navigate their menus with DTMF, but dialer did not transmit any. Looking at couple of icons on it I still did not recognize any that might activate that function. Is it available at all, or I just don't know how to activate it?
Latest stock ROM, unrooted.
Anyone who can help me has my thanks.

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