Grandstream GXP 2140
Use the + and - buttons on the phone to change the volume of the call or the ringtone.
Grandstream GXV 3275
Use the speaker + and speaker - buttons under the display to change the volume of the call or ringtone.
Modified on: Fri, Jun 10, 2016 at 12:17 AM
Use the + and - buttons on the phone to change the volume of the call or the ringtone.
Use the speaker + and speaker - buttons under the display to change the volume of the call or ringtone.
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