For Spanish CallHome, (Ries, 1999) reports 76.2% accuracy with a hybrid approach that couples Neural Networks and ngram backoff modeling; the former uses prosodic features and POS tags, and interestingly works best with unigram backoff modeling, i.e., without taking into account the DA history -see our discussion of the ineffectiveness of the DA history below.
(Ries, 1999) does not mention 4 The baselines for CallHome37 and CallHome10 are the same because in both statement is the most frequent DA.