False Answer Supervision
False Answer Supervision (FAS) refers to VoIP fraud, when A-party is incorrectly billed: billed duration is more than duration of actual telephone conversation. The FAS is usually performed by VoIP wholesalers in their softswitches for randomly selected calls. Adding a small amount of extra billed seconds for many calls means a big revenue for the VoIP wholesaler. Actually it means stealing of money from caller (A-party).
Implementation of FAS
The FAS fraud can be implemented in a softswitch in many different ways.[1] Here are few of them:
- False billing of A-party without calling B-party. Usually a fake ringback tone, loopback audio or voicemail message is played
- Start of billing before actual answer of B-party
- Extra billing after disconnection of B-party
Detection of FAS
The FAS can be detected and blocked in a softswitch. Common methods are:
- Manual verification of Call Detail Records, listening to voice recordings
- Identification of FAS types and using algorithms to automatically detect the FAS
- RTP audio signal processing: detection of voice
- RTP audio signal processing: detection of silence
- RTP audio signal processing: detection of ringback tone
See also
- Phone fraud
- Voice over IP
- Telecommunications billing
- Softswitch
- FAS described on voip-info.org[2]
References
- ↑ "FAS types: detection, generation in a softswitch". StarTrinity. 2016-08-06.
- ↑ "Fake False Answer Supervision (FAS) service". VoIP info. 2016-08-06.
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