Aastra 6771/6773/6775 (OpenPhone 71/73/75) System Phones31Fig. left: Key extension Aastra M671 (KeyExtension 73P); Fig. right: Key extensionAastra M676 (KeyExtension 75D)For the System Administrator:In the “Mounting and Commissioning” (with an Aastra 800: “Installing and Commis-sioning”) guide you will find the corresponding assembly instructions in the chapter“Connecting the Key Extension”.Operating the Key Extension KeysThe keys of the key extension are used in the same way as programmed keys, asdescribed in this user guide (see the following sections: Programming Call Numbers(Destinations) starting on page 128, Programming Functions (Features) starting onpage 129, Programming the Call Keys starting on page 96).Choosing a Key LevelKeys can be programmed on three levels with a key extension Aastra M676(KeyExtension 75D). There are a total of 60 storage locations available on 20 keys.To toggle between the levels, use the level keys ; on the lower left. The illumi-nated LEDs next to the key indicates that the level is activated. In the display of thekey extension, you will also see the text with which this storage location is labelled.Level keys
