RCA VISYS H5450 - Manual (Page 65)

Other Information
Sound Signals
Signal Meaning
Single short beep Successful key entry
Single long beep Successful operation
triple short beep Power oN (cordless handset)
Unsuccessful key entry
a long warbling tone (cordless handset) Signals an incoming call
one long beep confirmation tone
one long beep and two short
beeps every minute low battery warning