oFono does not currently (as of 0.38/git-master) support any ways to stop sending DTMF tones. Thus, unless oFono APIs are changed, ring's Channel.Interface.DTMF.StopTone() should return NotAvailable as specified in: http://telepathy.freedesktop.org/spec/Channel_Interface_DTMF.html#Method:StartTone Alternatively ring could implement MultipleTones() as that more closely maps to oFono APIs.
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