HV.Select Yealink T42S Phone User Guide④Mute Key Toggles and indicates mute feature.Headset Key Toggles and indicates the headset mode.Message Key Accesses voice mails.Redial Key Redials a previously dialled number.⑤ SpeakerphoneKey Toggles the hands-free speakerphone mode.⑥ Volume Key Adjusts the volume of the handset, headset,speaker, and ringer.⑦ Keypad Provides the digits, letters, and special characters incontext-sensitive applications.⑧Scroll through the displayed information.Confirms actions or answers incoming calls.Cancels actions or rejects incoming calls.⑨ Soft KeysThese provide standard function keys that interact withthe service such as Hold or Transfer. Using the FeatureManagement Portal, these can be removed or moved todifferent positions.⑩ Speaker Provides hands-free (speakerphone) audio output.⑪ Reversible TabSecures the handset in the handset cradle when theIP phone is mounted vertically. For more informationon how to adjust the reversible tab.⑫ Hookswitch• Picking up the handset from the handset cradle, thehookswitch bounces and the phone connects to theline.• Laying the handset down on the handset cradle, thephone disconnects from the line.Icon InstructionsIcons appearing on the LCD screen are described in the following table:Icon DescriptionNetwork is unavailableRegistered successfullyRegister failedRegistering