486 Ratio

SIP Code 486 was originally implemented as a “Busy Here” indicator. Over the last couple of years it has also been implemented by some carriers as an ANI blocker and can aptly be described as a “I’m not necessarily busy right now but I don’t want to talk to you.” response from the callee.

In organic traffic, the 486 ratio is normally under 2%. Scammers, by their nature, tend to do unpleasant things at high volume and it is reflected in their higher 486 ratio. If we see an account with a 486 ratio greater than 3% then we check 486% by ANI and put the offending ANIs into a YouMail Watchlist to see what the originator is saying to people.