Function switch_channel_dequeue_dtmf

pub unsafe extern "C" fn switch_channel_dequeue_dtmf(
    channel: *mut switch_channel_t,
    dtmf: *mut switch_dtmf_t,
) -> switch_status_t

\brief Retrieve DTMF digits from a given channel \param channel channel to retrieve digits from \param dtmf digit \return number of bytes read into the buffer