Call into the IP phone by dialing its DID number or extension number from another phone.  When it answers, dial “845464” (or the current security code if it was changed), two beeps will be heard.  Dial “*4”, wait for a beep and then begin recording (28 seconds of record time available).  Dial a “#” to stop the recording and begin automatic playback.  If you need to re-record, wait for the message to finish and dial “*4” again.  Hang up when finished recording.