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Or use it as ENTER key when in Keypad Configuration Adjust volume by pressing “– “or “+” 0 - 9, *, # Standard phone keypad; press # key to send call; press * key to for IVR functions MAKING PHONE CALLS Handset, Headset and Speakerphone The GXP1400/1405 allows you to make phone calls via handset, headset or speakerphone. During the active calls the user can switch between the handset, headset and the speakerphone by pressing the corresponding keys on the phone. Dual Lines with SIP Account GXP1400