DSR works particularly well in weak signal strengths when compared to server based speech recognition using GSM to convey the audio. Complete control in the terminal. Parallel for voice and visual. Thin clients - all processing handed off to server. Fat clients do all the work locally.
Intermediate architectures are also possible.
ETSI is keen to promote the merged language approach, with speech handled as data and transferred in parallel with markup. Some authors don't care about modalities, and the authoring system should be able to fill in for the roles of the graphic designer etc. SMIL doesn't really deal with dialog. Another question Jim Larson - Ergonomic and End user oriented issues 1. When is multimedia really useful versus monomedia.