It is a directory of companies' phone numbers, which go directly to a person (bypassing the machines.) I think this directory actually does provide users with value, and is far from your typical link farm.
It is probably a great resource for people who want to call companies to sell them a service. We get calls every week from incompetent SEOs. They are a huge waste of our time.
Why would you want to submit your website to a directory that is going to be used by telemarketers? Do you enjoy talking to these people?