Yealink T4 Series IP Phones User Guide1462. Do one of the following:l On the SIP-T46S/T46G/T42S/T41S IP phone, highlight the X Available Network(s) (X represents the number ofavailable networks), and then press Enter.Highlight the connected wireless network, and then press Disconnect.l On the SIP-T48S/T48G IP phone, tap the connected wireless network or tap ->Disconnect.You can also disconnect the wireless network when deactivating the Wi-Fi mode.Related TopicsDeactivating the Wi-Fi ModeExpansion Module and Your PhoneThe expansion module is a console you can use to connect to an IP phone to add additional line keys and expand thefunctions of your phone. Yealink SIP-T48S/T48G/T46S/T46G IP phone supports expansion module EXP40. It has twopages of 20 flexible ext keys and it can be programmed up to 40 various features. This section provides you how to con-nect the expansion module EXP40, how to assign the features for ext keys and how to adjust the contrast and backlightof expansion module EXP40.For more information on expansion module EXP40, refer to the LCD Expansion Module EXP40 user guide on YealinkTechnical Support page.TopicsConnecting the Expansion ModuleAssigning the Features for Ext KeysAdjusting the Contrast of Expansion ModuleAdjusting the Backlight of Expansion ModuleConnecting the Expansion ModuleProcedure1. Connect the expansion module to the IP phone using the supplied connecting sheet and screws.2. Connect the supplied cord from the Ext jack on the host phone to the Ext in jack on the expansion module.Assigning the Features for Ext KeysYou can customize features for ext keys on the connected IP phone.Procedure1. Long press the desired ext key on expansion module.The IP phone LCD screen will enter the user setting interface of this key.2. Customize the specific feature for this key on the IP phone.3. Press Save.Adjusting the Contrast of Expansion ModuleYou can configure the contrast of the expansion module via the host phone.Procedure1. Navigate to Menu->Basic->Display->Contrast.If expansion module is not connected to the phone, the Contrast screen displays "No EXP".
