AASTRA 6755i User Guide EN - Manual (Page 140)

Handling Calls
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Ending Calls
To end a call, you first need to connect or reconnect to the call if not already connected (for example, if your caller is on hold).
Press
or the line/call appearance button of the active call to end the call. If connected through the handset, you
can also place the handset back on hook to end the call.
IP Phone UI