User Guide for the SIP-T23P/G IP Phone961. Press the OK soft key to redial the number.NoteYou can press a recall key to place a call back to the last incoming call.To configure a recall key via phone user interface:1. Press Menu->Features->DSS Keys.2. Select the desired DSS key.3. Press or , or the Switch soft key to select Key Event from the Type field.4. Press or , or the Switch soft key to select ReCall from the Key Type field.5. (Optional.) Enter the string that will appear on the LCD screen in the Label field.6. Press the Save soft key to accept the change or the Back soft key to cancel.Recall key is configurable via web user interface at the path DSSKey->Line Key.You can mute the microphone of the active audio device during an active call so thatthe other party cannot hear you. Call mute applies to all modes (Handset, Headset andSpeakerphone).To mute a call:1. Press during an active call.The LCD screen indicates that the call is now muted.Call completion is not available on all servers. For more information, contact your systemadministrator.