Because of compliance rules regarding the US Do-Not-Call list, the telemarketing landscape has changed dramatically in recent years. While cold calling unverified numbers is no longer legal, companies have found that legitimate targeted telephone leads are more valuable than ever. No longer inundated with solicitations, a customer is many times more likely to listen to today's marketing phone call than to a phone call made five years ago. There are a number of services that maintain targeted large business and consumer lead lists for use in telemarketing campaigns.