| Optional Accessories with Your Phone | 75out of resiliency mode automatically. Notification of resiliency is automatically dismissed, and you can use phonefeatures as normal.Note: If you sign into the phone using On-Premises account, you can use branch office resiliency feature.Current Online environment does not support this feature.Optional Accessories with Your PhoneThis section describes the optional accessories that you can use to extend your phone’s capabilities.• Supported Accessories• Headset• Using an EXP50 Expansion ModuleSupported AccessoriesYou can use your phone with different types of accessories. The following optional accessories need to purchaseseparately if required for your particular phone:• Headset• Expansion Module EXP50Check with your system administrator to find out which of these applications or accessories are available on yourphone.Note: We recommend that you use the accessories provided or approved by Yealink. The use of unapprovedthird-party accessories may result in poor performance.HeadsetYou can connect an analog or USB headset to your phone and use the headset to place and answer calls. If you wantto use the analog headset, you require an optional headset YHS33. For more information on how to use your USBheadset, refer to your USB headset documentation from the manufacturer. You can also pair and connect a Bluetoothheadset with your phone.• Analog Headset• Bluetooth Headset• USB Headset• Using HeadsetsAnalog HeadsetIf you want to use an analog headset, you require an optional headset YHS33.• Connecting a YHS33 HeadsetConnecting a YHS33 HeadsetProcedureSimply insert the headset connector into the headset port on the back of your phone.For the information on how to connect headset YHS33, refer to the YHS33 user guide on Yealink TechnicalSupport page.