User Guide SIP-T22P IP Phone48Two types of DSS keys: Line Keys and Programmable Keys. The details will be introducedin the following. The SIP-T22P IP phone supports 3 line keys.You can assign predefined functionalities to the line keys to have quick access tofeatures such as call return and voice mail. The line key LEDs will indicate status whenthe keys are assigned with particular features, such as BLF. The default key type of eachline key is Line.To configure the line key via phone user interface:1. Press Menu->Features->DSS Keys.2. Select the desired line key, and then press the Enter soft key.3. Select the desired key type from the Type field.4. (Optional.) Select the desired key event from the Key Type field.5. (Optional.) Select the desired account from the Account ID field.6. (Optional.) Enter the corresponding value in the Value field.7. (Optional.) Enter the corresponding value in the Extension field.8. Press the Save soft key to accept the change or the Back soft key to cancel.Line key is configurable via web user interface at the path DSSKey->Line Key.NoteCommon used line key features are explained in the following subchapters in detail: Speed Dial Voice Mail Directed Pickup Group Pickup DTMF Prefix Local Group XML Group XML Brower LDAP ConferenceWhen the phone is idle, you can also long press the line key to configure it directly on thephone.