Key takeaways ASR alone is gameable. A rising ASR means nothing without checking ACD and PDD alongside it. A rising ASR combined with a falling ACD is the clearest fraud signal in wholesale voice. Sub-second PDD on a distant route means the call never left the vendor's server. PDD over 7 seconds on a mobile destination is a strong indicator of SIM farm termination. The three metrics form a triangle. Manipulating one always distorts the others. ASR — Answer-Seizure Ratio — is one of the most commonly reported metrics in VoIP wholesale. It is also one of the most commonly misread. Understanding what it actually measures, and more importantly what it does not, is essential for anyone who routes traffic professionally. ASR is simply the percentage of call attempts that result in an answer. If we send 100 calls to a vendor and 60 of them are answered, the ASR is 60%. That is the whole formula. Nothing sophisticated about it. The trouble begins when operators treat a good AS...