Northern Modular Telephone Manuale Utente

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Special features
Centrex/Exchange Line Switchhook Flash
Centrex/Exchange Switchhook Flash allows you to signal the Central Office/Exchange (CO) during an 
established call to use a Centrex service such as call transfer or three-way calling. 
To use Centrex/Exchange line Switchhook Flash:
1.
Press 
 
or enter the Switchhook Flash FFC. You hear special dial tone.
2.
Enter the codes for your custom Centrex feature.
M1 Display/MSL-100 Inspect
When you are on an active call, you can identify a second incoming caller with the Display feature. 
This feature differentiates between external and internal calls. For internal calls, it also displays the 
caller’s identity. Your telephone must have a Display Module Option to use this feature.
To view the name of a second caller while on a call in progress:
1.
While on a call, you hear the tone of the second call.
2.
Press 
œ. Press ∫
Inspect .           .
on an MSL-100.
3.
Press the DN key beside the flashing 
º. The caller's name is displayed in the Display Module.
Note:
Displaying the second caller's name does not interfere with the current call in progress.
Trunk Switchhook Flash