9.15. ADJUSTING THE CONTRAST OF THE DISPLAY (8028/8029/8038/8039) 51
9.16. SELECTING LANGUAGE 51
9.17. PROGRAM THE KEYS FOR THE PERSO PAGE OR THE ADD-ON MODULE 52
9.18. SENDING DTMF SIGNALS 52
10. GUARANTEE AND CLAUSES 53
10.1. SAFETY INSTRUCTIONS 53
10.2. REGULATORY STATEMENTS 54
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