Short and straight to the point. They give us a pcap and the title itself is a huge clue about where we should look. Wireshark has an option to extract VoIP content so, if we are lucky, we may be able to use it to solve the challenge, lets go:
[More](https://blog.kalrong.net/en/2016/12/14/seccon-2016-voip-forensic-100/)