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The Ghost Call Center

Miscellaneous 250 pts standard
Challenge Description

The abandoned Ravenwood Call Center was shut down nearly a decade ago.

Despite being disconnected from the telecom network, strange call records continue to appear every night. Investigators recovered a distorted recording and a set of call logs from the final evening before the facility was permanently sealed.

Can you uncover the message left behind by the callers?

Flag Format - HackCTF{...}

Author - prap

Hints
View Hint : Hint 1:

The phone numbers matter more than the calls themselves

View Hint : Hint 2:

The callers speak ASCII , The durations speak binary.

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