Samsung HM6400 - Manual (Page 24)

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Using call functions
Available call functions may vary depending on the phone. •
For better sound quality during a call, avoid covering the secondary microphone. •
Making a call
Redialling the latest number
To redial the latest number of the primary phone,
Press the Talk button. •
You can also use the voice command • “Redial.”
To redial the latest number of the secondary phone,
Press the Talk button twice. •
You can also use the voice command • “Redial Two.”
For some phones, pressing the Talk button opens the call log list. Press the Talk
button again to dial the selected number.