Group pickup / call pickup is the feature you want.    You put everybody 
in a group and if you want to grab a ringing phone, you just hit the 
group pickup code.
http://www.voip-info.org/wiki/view/Asterisk+callgroups+and+pickupgroups
Rob Schall wrote:> Question:
> 
> Is it possible to pickup someone else's call who didn't
"park" a call?
> My boss would like to see a way to pick up some one else's incoming
call
> if they aren't at their desk and it's not forwarded. So if my phone
were
> ringing and he knew i ran down the hall, he could press some key combo
> and give my extension, and it would transfer that incoming call to him.
> 
> Possible?
> Rob
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