Analysis of Payphone and Kiosk Telephone Calls
Assessment from a Digital Forensics Perspective
Within the scope of FETO payphone cases conducted throughout Turkey, calls made from landlines (payphones and kiosk phones) are considered one of the most critical evidence of organizational communication. Particularly within the framework of payphone investigations, technical data obtained through HTS (Historical Traffic Search) analyses have been both evidence and subject of objection in many cases.
What are Sequential and Periodic Calls?
Periodic Calls: These are calls that repeat at specific intervals such as weekly or monthly. This regularity is a common communication method in FETO’s cell-type organization.
Sequential Calls: These are consecutive calls made from the same landline within short time intervals, usually separated by less than 20 seconds. Such calls are critical analytical data for payphone cases as they demonstrate chain communication within the organizational structure.
EGM Technical Report and Organizational Communication Model
According to the technical report dated December 11, 2018, by the General Directorate of Security, FETO uses the following methods when communicating through payphones:
Sequential calling of personnel of the same rank or force,
Calling each person from different landlines at different times,
Preference for brief, concise calls that are difficult to monitor in terms of content,
Strategy of avoiding attention by making calls typically during non-working hours.
This model has been thoroughly examined in payphone and witness acquittal decisions, providing insight into how technical data is correlated with organizational context.
Technical Impossibility and 0-Second Records
The concept of technical impossibility arises when there is a 1-19 second interval between sequential calls. It is physically impossible to reach different people in such a short time. Therefore, such records have been evaluated under “insufficient evidence” in payphone acquittal decisions 2021.
Additionally, 0-second HTS records indicate only an attempt to call and that no conversation took place. Such failed calls are often interpreted in favor of the suspect in FETO payphone investigations.
Importance of Cross-Matching in HTS Data
For reliability, not only base station (outgoing call) records but also counter-base (incoming call) records should be analyzed. This two-way verification establishes whether HTS data constitutes solid evidence and prevents misinterpretations in sensitive processes like FETO payphone cases.
Scientific and Objective Analysis of Payphone Investigations with Digital Forensics Support
📌 DNA Criminal and Digital Forensics Consultancy provides expert witness and consulting services in HTS analysis, sequential call detection, organizational communication analysis, and digital evidence examination.
Our Services:
🔍 HTS Data Analysis and Matching
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🧩 Sequential Call Technical Impossibility Reports
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Frequently Asked Questions (FAQ)
Digital Forensics | HTS Analysis | Payphone Investigations
📌 What is HTS Analysis and What is its Purpose?
HTS (Historical Traffic Search) analysis is a technical examination that reveals with whom, when, and how frequently a person communicates by examining their past telephone call records. It is particularly used in analyzing communication traffic linked to terrorist organizations.
📌 What Does Sequential Calling Mean?
Sequential calling refers to consecutive phone calls made from the same landline or payphone within short time intervals. These calls can be evaluated as part of an organizational communication model. Sequential calls occurring within less than 20 seconds are carefully examined.
📌 how is Periodic Calling Identified?
Periodic calling refers to phone calls that repeat regularly at specific time intervals (for example, once a week). Such calls may indicate ongoing organizational contact.
📌 What Does a 0-Second Call Record Mean?
0-second HTS records typically indicate failed calls. They appear in the system as 0 seconds when the called person’s line is closed, unreachable, or when communication fails due to technical issues.
📌 What is Technical Impossibility?
Technical impossibility refers to calls made in an impossibly short time frame (1-19 seconds) between two sequential phone calls. Such records may question the accuracy of HTS data.
📌 Can HTS Records be Used as Evidence in Court?
Yes, but technical analysis of HTS records must be done correctly and the data must be free of contradictions. DNA Criminal ensures scientific evaluation of HTS records within the framework of digital forensics.
📌 What Does a Digital Forensics Expert Do?
A digital forensics expert provides expert-level technical support in examining digital data, conducting HTS and GSM analyses, and reporting evidence-quality data.
📌 What Type of Analysis is Conducted in Payphone Investigations?
Many criteria are technically examined, such as call frequency, time between calls, characteristics of landlines used, and rank and duty similarities of called persons. Sequential and periodic patterns are identified to analyze organizational structure.
📌 how is the Accuracy of HTS Data Verified?
Outgoing and incoming call records are cross-examined (Base and Counter-Base). Consistency in data strengthens its evidentiary value in judicial processes. Contradictory, technically impossible, or 0-second records must be analyzed in detail.
📌 What Services Does DNA Criminal and Digital Forensics Provide?
HTS and GSM analyses
Sequential/periodic call detection
Digital evidence analysis
Technical impossibility analysis
Expert report preparation
Forensic and criminal consulting
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