UNE 133503:2013 Mobile telecare services. Communications protocol between terminals and alarm centers
UNE-ETS 300381:1999 Telephony for people with impaired hearing. Inductive coupling of telephone headsets to hearing aids
UNE-EN 301104 V1.1.1 (Ratified) Human factors (HF). Requirements derived from the human factor for the European telephone numbering area (English)
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