AT&T 272 ユーザーズマニュアル

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IN CASE OF DIFFICULTY
Problems with Line Status Lights
Make sure all plugs are connected properly.  Inspect the line cord
connections at the modular jack and at the telephone.  Also inspect the
coiled handset cord connections at both ends.
Try replacing old batteries.  See the INSTALLATION section of this
manual.
Telephone Does Not Ring
Make sure the 
RINGER switches are set to LO or HI.
If there are several other telephones on the same line, try disconnecting
some of the other telephones.  Having too many telephones connected
can also create problems such as low ringer volume, or impaired sound
quality during calls.