In this video you can heear the phone conversation between Batman and Zsasz. After Zsasz's hideout's location is revealed you have to defeat him.

There are phones all over Arkham City. When you hear it rings you have to pick it up, and then you get a new phone location. You have to be quick becouse you have only limited to to reach it! You cannot pick up the phone while you are in a battle so i suggest you to do these side mission when you don't have a partly sealed area (like Joker is heavily protecting the Steel Mill).
When Zsasz starts to speak a blue circle will appear over the phone. While tracing the phone it will move to different locations you have to follow that with the help of the left analog stick. After the green bar is filled at the bottom of the page you managed to track down Zsasz's hideout.
If you do this side mission you will recieve two trophies/achivements:
- Ring, Ring (when you first pick up the phone)
- Dial Z For Murder (after defeating Zsasz)

Official game community website: [ Ссылка ]
Rocksteady: [ Ссылка ]
DC Comics Batman page: [ Ссылка ]

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