How can i implement Call Parking

Definition: Call parking allows you to park a call and pick it up at another location.

Lets say 111 dialed 222 and now 222 somehow parked the call using some dial code (e.g 150) and now 222 can reach any other phone and can pick up the call by dialing call parking answer code (e.g. 151) + extension from where he parked....

How can i implement it in SER. is it already there...

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