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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
audio - If I wanted to simulate keypresses over a phone line, could I just play dial tones? - Electrical Engineering Stack Exchange
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Touch tone telephone key pad for Western Electric, Stromberg Carlson and ITT telephones such as the 2500and 2554 model | Phone Shop
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File:DTMF keypad layout.svg - Wikimedia Commons
Did the dial tone for rotary phone sound different than the dial tone for touch tone? - Quora
In-Band Signaling: Dual-Tone Multifrequency Dialing | Hackaday
