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Enable Long DTMF on iPhone 6

Acknowledging an alarm from an automated device requires a DTMF tone longer than the one on my iPhone 6.  Previous iPhone I believe had a "switch" so the DTMF would be continuous as long as a button was held down.    I do not find this switch on the iPhone 6.   Is there a way to enable long DTMF tones or is there an application that will allow me to answer a call and respond with a long DTMF?


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