Here is a little story of what i’ve achived and what i dream to achive… 
I have extension 10 and my manager has the extension 20. A call is coming from outside, i pick it up and say
-“Hello, how can i help you…?”.
-“I would like to talk with your manager, i’m a police officer…”
-“Just a moment,please”
------------------------The present state---------------------------------
I am parking the call, dialing #70. Asterisk says “your call is parked at extension 71”. I hang up the phone. I dial 20(manager’s extension).
-“Mr.Manager, the police is on the phone,searching for you”
-“Give me the call NOW!”
-“Please dial 71 to get the call…thank you” (This is the first scenario)
-“Mr.Manager, the police is on the phone,searching for you”
-“Tell them, i am not here” (The second scenario)
So, i have to hang up again and dial 71 to get the call back(un-parked) and tell him a lie…
--------------------The state i dream to do------------------------------
(As in a company that i worked, but they use an analog PBX)
The only thing i had to do is, dial the extension 20, speak with manager and if he wanted the call i had to push the Transfer key and hang up.
Or i had to press #20, speak to the manager and if he wanted the call i had only to hang up the phone…so simple (without any intermediary calls and extensions or parkings)…
Is this possible with asterisk…?
Excuse me for the long story, but i didn’t know how to explain all this!
Thank you