We just purchased a BCM 50 and the vendor that we purchased the system from did not have the password. We did a level 2 reset and now that the reset is complete I connected to digital sets to the system. If i pick up the phone to dial an extension the phone beeps and says "keycode reqd". Do we need keycodes to use the 4 incoming lines and 12 digital stations that come with the system? Thanks for your help.