I have finally solved my problem to register voice tags. The procedure is as follows:


Go to edit phone book screen----select name for editing----touch bottom arrow of edit contact data screen----touch "voice Rec" of voice recognition:off screen----touch "Rec" to record a voice tag.

Repeat above procedure to register up to 20 voice tags. Once this has been done, one can use the voice command of "dial by name" during driving without inputting the phone number.