A spam call is an unsolicited call where the intention is often to trick or scam the recipient.
46 Labs subscribes to Youmail’s Embedded Call Protection (ECP) Service. This service provides the Orchestrators with a near real-time (hourly updated) database of US phone numbers that could be being used to generate SPAM calls.
The number of phone numbers in the database ranges from 500,000 and 1.5 million known spammers depending on the season and the current volume of numbers being used by unwanted callers.
The ECP service uses a set of constants to indicate how likely it is that a given phone number will be originating unwanted or illegal calls.
They are, in order of increasing likelihood of being a spammer/scammer:
DEFINITELY_NOT (-1.0)
ALMOST_CERTAINLY_NOT (-0.8)
PROBABLY_NOT (-0.6)
MAYBE_NOT (-0.4)
UNKNOWN (0.0)
MAYBE (0.4)
PROBABLY (0.6)
ALMOST_CERTAINLY (0.8)
DEFINITELY (1.0)
Not all of these likelihoods will be present in SPAM Database. Typically, 98% or more of the phone numbers in SPAM Database have an ALMOST_CERTAINLY or PROBABLY likelihood. Less than 1% will be MAYBE and phone numbers with other likelihoods will often not be present in the SPAM Database.
The Orchestrator will only allow associating an action (Blocking the Call or Rewriting the Caller ID) for likelihoods with a 0.0 or higher probability.