NEC SL1000 Features And Specifications Manual page 170

SL1000
The number is displayed.
3. To dial out the displayed trunk number, press a Line/Trunk Group key.
If the previewed number as a trunk access code (e.g., 9), you can press Speaker instead.
- OR -
To dial an Intercom number, press Speaker.
- OR -
To cancel the number without dialing it out, press Hold.
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Dialing Number Preview