Teleport Communications' service was very popular with long distance carriers such as AT&T, MCI and Sprint who wanted to connect their long distance networks to their largest customers without using the local telephone companies (the so-called regional Bell Operating Companies—RBOCs) which were perceived as strategic competitors that wanted to get into the long distance business. Teleport Communications' services were also popular with financial services companies that wanted duplicate and independent high speed connections between their New York area offices and the stock exchanges.

So basically, if you had Sprint or A T&T long distance, it's a collection agency; that shows up on your Caller ID as KPEP.