Hello, As part of our academic work, we are trying to systematize knowledge on telecom fraud, focusing on voice telephony. For this purpose, we created a high level picture that summarize and organize the fraud ecosystem in different layers, ranging from the inherent flaws in the roots of the system to the final goals of the fraudster. We are now looking for feedback from the industry experts of the field through a survey (should take 5-10 minutes to complete): https://www.surveymonkey.com/r/3CJ7HY9 The responses to this survey will be anonymous and only be used aggregated for research purposes. We will publish a research paper using the results of this study, making this work helpful for both academia and industry. Thank you for supporting our work with your valuable insights. Best regards, Merve