Cortelco 2750 - Manual (Page 48)

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7.1 Line Status and Calls on Hold
The line status indicators of the 2750 phones will recognize standard telephones. When a call is placed
on hold at a 2750 telephone, it can be taken off hold at a standard telephone.
Note: If the line status indicators of your 2750 telephones do not function properly, follow the
instructions for setting the loop voltage detector in Section 2.4.
7.2 Call Privacy
Call privacy is not observed by standard telephones. A standard telephone on any line has access to that
line at any time, whether or not it is being used by a 2750 telephone.
7.3 Intercom
Standard telephones cannot use the intercom feature to communicate with 2750 telephones.
7.4 Fax Machines and Modems
You may connect modems or fax machines to any of your lines, and the line indicators of the 2750
telephones will light when these devices are using a line.
8. POWER FAIL OPERATION
If AC power is disconnected or there is a power failure, the telephone automatically switches to battery
operation for approximately two hours. When the power is restored, the telephone automatically
switches back to AC power and resumes normal operation. If the battery is missing or low on power
when AC power is lost, the telephone will not function. However, all feature settings and memory
numbers will be maintained.
Note: It is recommended to always have at least one telephone connected that does not require battery
power, so that you are always sure to have use of a telephone during a power failure.