The Ears Everywhere challenge in MW4 DMZ requires you to access the broadcasting system and collect the encrypted voice logs. You need to visit the DBN TV building and reach the server room on the second floor to complete the objective. However, watch out for the commander and nearby mines while exploring the building.
How To Complete The Ears Everywhere Quest

In order to finish the Ears Everywhere quest from the MW4 DMZ game, you have to access the broadcasting system at Cheonwang Peak Array and collect the voice logs that are encrypted. Firstly, start playing in any match and reach the point where you have to accomplish the task. There will be a blue building with the DBN TV logo on its roof. You could enter through the main entrance, but there are other ways to get inside too.

You have to choose from various methods to get into the building; however, you can also use the pipe, which is located near the building, to get onto the second floor. When you are in the building, go upstairs. However, be careful about a commander who might spawn there and about mines which surround the building. If you notice these mines, watch out for the commander.
On the second floor, find the server room and access the broadcasting system in order to move the quest forward. After the interaction with the broadcasting system, collect the item which will appear nearby. The item will allow you to accomplish the rest of the quest. You can also loot the remaining servers to collect new crafting materials. After doing all that, you will find all the objectives for the Ears Everywhere challenge ticked off, which will complete this PG 20 order in DMZ.
