USING THE HEADSET OR SPEAKER Use the Speaker Button to turn speaker ON/OFF. Use the Headset button to use the...

Thank you for purchasing Grandstream Small Business IP phone GXP1610/GXP1610P/GXP1615/GXP1620/ GXP1625/GXP1628/GXP1630. GXP16xx series is a next generation small-to-medium business IP...