AT&T 945 사용자 설명서

• Make sure the phone is programmed

for that line to be absent. (See “Turn 

Line Usage On or Off  for Each Line”  
on page 37.)

• Make sure that your Line Groups are

programmed properly. (See “Assign the 
Line Group for this Phone” on page 50.)

• Disconnect all other devices (fax, modem,

credit card reader, etc.) from any lines
connected to your 945 phone. These
devices can interfere with the telephone’s
data links.

• Make sure the total length of telephone

wiring used in your phone system is less
than 600 feet. In some cases a Z800A 
filter can be used in a phone system with
more than 600 feet of wire. AT&T highly
recommends that a Z800A filter be installed
by a professional. AT&T CANNOT
guarantee that this telephone will work 
with such a filter, and IS NOT responsible
for such installations. A Z800A filter can 
be obtained by calling 

.

(See “DSL Users” beginning on page 4 for
details.)

Tone signaling does not work during 

conference calls.