![](/images/new-backgrounds/1310228/310228139x1.webp)
974CIB_06 4/7/06 3:33 PM Page 67
Intercom operation
This 974 telephone is fully compatible with any AT&T
This 974 telephone is also compatible with any AT&T 964/955/944 phones you have previously installed. This 974 telephone is NOT compatible with any 843, 853, 854, 874, or 954 telephones you may have previously installed.
NOTE: If you have one or more 964, 955, or 944 phone(s) installed in the same phone system with this 974 telephone, you can only have 12 extensions in the phone system.
Each individual phone in your telephone system MUST be assigned a unique extension number for the intercom feature to work. See
Assign an extension number to your phone on page 24 for instructions.
NOTE: If you subscribe to DSL service, please read DSL users beginning on page 4 for information about minimizing problems with this phone caused by DSL signals.
This intercom features both a
An intercom call rings at the extension called with a repeating
A
NOTE: If a line is in use, pressing Iwill place the line on hold and activate the intercom.
Intercom operation
67