
Aastra 677xip (OpenPhone 7x IP) System Telephones: Extensions and Accessories Key Ex-
The following equipment combinations are possible:
Key extension …  | … with the features  | connectable to a  | 
  | 
  | system telephone  | 
  | 
  | 
  | 
Aastra M671  | – 36 keys with LED indicator  | – Aastra 6773ip  | 
  | – Labelling on label strips  | (OpenPhone 73 IP)  | 
  | 
  | |
  | 
  | – Aastra 6775ip  | 
  | 
  | (OpenPhone 75 IP)  | 
  | 
  | 
  | 
Aastra M676  | – 20 keys with LED indicator  | – Aastra 6775ip  | 
  | – 3 keys with LED indicator to  | (OpenPhone 75 IP)  | 
  | shift levels; enables program-  | 
  | 
  | ming of 60 storage locations  | 
  | 
  | on each key extension  | 
  | 
  | – Labelling of the keys over  | 
  | 
  | the display; each key is as-  | 
  | 
  | signed to a display line  | 
  | 
  | 
  | 
  | 
The number of key extensions connected to a system telephone (up to three) can be set in the Configurator of the Aastra 800’s Web Console (in the menu Telephony: Devices: VoIP Phones). In the Telephony: Devices: System Phones menu, the keys can be programmed as call keys or assigned functions or desti- nation call numbers. Users can change this programming as required.
The maximum distance between the connecting socket that the telephone/key extension device combination is operating through and the Aastra 800 must be less than 1000 metres. You will need a 
Configuration | Needs Power Supply Unit | 
  | 
  | 
IP system telephone  | Yes  | 
  | 
  | 
IP system telephone with   | Yes  | 
tensions  | 
  | 
  | 
  | 
IP system telephone with PoE (Power  | No  | 
over Ethernet)  | 
  | 
  | 
  | 
IP system telephone with   | No  | 
tensions and PoE  | 
  | 
  | 
  | 
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