More than 50 business broadband providers have so far signed up to offer services via Be Broadband's ADSL2+ network.
Over the past month, the internet service provider has been working with Cerberus Networks to encourage broadband resellers to sign up to use its infrastructure, which offers an alternative to BT's and speeds of up to 24Mb.
As a result of the high levels of demand among providers, Be is extending its summer deal, which promises their new customers free installation and two months without any subscription fees, to the end of September.
"The response to our recent campaign has been fantastic," said Bob Hendy, director of Cerberus Networks, which offers services to internet resellers.
"We have increased our budgets and extended the promotion to the end of September as the demand has been so high."
He added that feedback from ISPs indicated the "reduced support overheads" and "improved performance" afforded by the network are providing real benefits to businesses and customers.
This month, Be also revealed that it will be offering its own broadband customers discounts on an IT support call-out service called Geeks-on-Wheels.