VTech SN6187 Abridged manual - Manual (Page 43)

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Telephone settings Telephone settings
Dial mode
The dial mode is preset to touch-tone dialing. If
you have pulse (rotary) service, you must change
the dial mode to pulse dialing before using the
telephone to make a call.
Press MENU when idle.
Scroll to Settings, then press SELECT.
Scroll to Dial mode, then press SELECT.
Scroll to select Touch-tone or Pulse, then
press SELECT.
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