Thanks for your answer.
I thought about the line keys, however that means she will get all the calls all the time, right ?
With ring groups, so each number would be a ring group, and the attendant could toggle her presence in each of these groups. Now let's say other attendants want the ability to take a pause and reroute their calls to another site, I could also use that presence in the ring group idea. They would get out of the group, and either someone else is in the group and takes the call, or nobody is in the group and I set up a call reroute 1st alternative to another console, or maybe another ring group.
We're talking about buttons on a desk phone, right ?
What do you think ?