HP Compaq Presario,Presario 5116 Quick Start Manual page 155

Your telephone company may make changes in its facilities,
equipment, operations, or procedures that could affect the proper
functioning of your equipment. If they do, you will be notified in
advance to give you an opportunity to maintain uninterrupted
telephone service.
If you experience trouble with this telephone equipment, contact
your local telephone company for information about obtaining
service or repairs. Your telephone company may ask that you
disconnect this equipment from the network until the problem
has been corrected, or until you are sure that the equipment is
not malfunctioning.