AASTRA 600d for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 79)

Telephoning
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Caller list: Displays entries in the caller list. You can search a call number in the caller
list. This menu entry is only available if you have configured local list access
(see page 131).
Add …: The call number of the person you are speaking with is added to the personal
phone book, the central phone book or the VIP list.
Door opener:* You activate the door opener.
Enquiry, Toggling, Transfer and Conference
Enquiry/Toggling
During a call you can consult another subscriber.
You are making a call.
Initiate enquiry:
Press softkey briefly. Your first call is placed on hold.
Enter internal or external call number. Note the type of line seizure (see
page 54).
You are speaking with the subscriber called.
For toggling (switching back and forth between callers):
Press softkey.
Ending toggling/enquiry:
Press softkey briefly.
/ Use the navigation keys to select the Disconnect menu entry and
confirm with the Ok softkey. The current call is ended.
Press softkey briefly. You are speaking with the waiting subscriber
once again.