2.SDT
This unit will check your line for a stutter dial tone every time you hang up or each time a call goes unanswered. The MESSAGE indicator will flash if a stutter dial tone is detected. There may be some delay in lighting the MESSAGE indicator. This delay is due to regulatory matters and does not indicate a problem with the unit.
This unit may not be activated or deactivated under certain conditions. For ex- ample, when you retrieve messages from an outside phone (not your own tele- phone number), the MESSAGE indicator may not be canceled when you return home. If you experience this situation, pick up the handset and hang up. The MESSAGE indicator will cancel.
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