Anyone know why if a DN's main number is in use / busy and calls ring to a 2nd line, it shows the name of the called party / owner of the phone, rather than the calling party, although it shows the DN of the calling party. ie. It looks like you are calling yourself when you are on your main line when 2nd calls roll over to line 2. Is there a setting to correct this so it show the calling party as it does when calling in on the main line?