AASTRA 600c_d for OpenCom 1000 User Guide EN - Manual (Page 102)

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If you yourself want to make an internal or an external call, use the INTERNAL key (I) to seize an
internal line; you can then dial an internal number immediately or seize an external line by dialling a
line code digit (your own call number is then busy as a result). You can also use the executive’s MI
key to make calls. However his call number is then busy. To reach the executive directly, simply press
the partner direct call key (P). The key tells you whether the phone is free or busy. Calls can also be
made when the phone is busy.
On phone in the seating area
On the phone in the seating area calls for the executive and for the secretary are signalled on their
MULTIPLE-INTERNAL key (MI) (MI key with call number 10 for the executive, MI key with call number
11 for the secretary).
The executive and the secretary can be reached directly from the phone in the seating area using the
partner keys (P) (the executive using the P key with call number 10; the secretary using the P key
with call number 11).
Both the executive and the secretary can reach the phone in the seating area from their own phones
using the corresponding partner key (P-SE).
Team functions