Kammu is a language that has developed lexical tones rather recently. One dialect is a tone language with (high or low) tone on each syllable, while the other main dialect lacks lexical tones. The dialects differ only marginally in other respects. This allows us to investigate how the existence of lexical tones in a given language influences the use of intonation. We performed a study of tonal means of phrasing in tonal vs. non-tonal dialects. We did find differences in boundary signaling. In both types of dialects the differentiation between marked and unmarked boundaries is relevant. At marked phrase boundaries we find signaling of focus and of some expressive meanings. The difference between the dialects is in the functional load of the intonational gestures. In the tone dialects pragmatically marked boundaries are assigned high pitch, while in non-tonal dialect the falling tone has a high pragmatic load.