Reading ASR, ACD and PDD without a telecom degree
A plain-language guide to the three route-quality metrics every VoIP buyer should watch, and what healthy numbers look like.
Route quality gets described in acronyms that sound intimidating but measure very intuitive things: how often calls connect, how long they last, and how quickly they start ringing. Master these three and you can judge a route in seconds.
ASR — are calls connecting?
Answer-seizure ratio is the percentage of call attempts that are answered. A steadily healthy ASR means the route is completing calls; a sudden drop is your earliest warning that a carrier is degrading and traffic should be moved.
ACD — are the calls real?
Average call duration hints at whether connected calls are genuine conversations. Human-length ACD suggests real engagement, while suspiciously short durations across the board can indicate a routing or audio problem worth investigating.
PDD — how long until it rings?
Post-dial delay is the gap between dialing and the first ring. Low PDD feels instant to callers; high PDD makes people hang up before the call even starts. Watch it especially on long-haul international destinations.
Track all three per destination, not just as an account-wide average, because one bad country can hide inside otherwise healthy totals.
Put it into practice
Create a TradeaDial account and route your first call the same day.