Yell.com's product has been designed to benefit both online media owners and Yell.com's advertiser base.
The service, which launches this month, can deliver geographically and contextually relevant Yell.com ads on to participating websites, giving advertisers extended reach.
Participating media owners are remunerated on a pay-per-click basis and can choose which business classifications appear on their websites, eliminating competitive issues.
said its filtering techniques ensure that inappropriate ads will never be served to partner websites.
The , and have already signed up to the netReach network after trialling the service between November 2007 and January this year.
Ian Bowen-Morris, head of ad syndication at Yell.com, said: "Given the growing trend from web users to filter out or turn off from sites serving irrelevant content, leading web publishers are keen to find a trusted solution for syndicated advertising.
"As Yell.com is trusted by thousands of people every day to find business details and can offer a high level of content control to partners, we believe we can really add value to a wide range of online media owners."
NetReach has been developed in partnership with Mirago, a company that offers search and advertising platforms for media companies.