The deal gives Daisy and its 60,000 customers access to BT’s Wholesale Hosted Centrex (WHC) platform.
This offers cloud-based unified communications services, including HD voice services, call analytics and web collaboration.
As part of the deal, Daisy’s services will be migrated to the platform over the next 18 months.
In return, Daisy will re-sell BT’s platform services to its wholesale partners and through its retail channel.
However, according to a new forecast from Gartner, the UK’s decision to leave the European Union will erode business confidence and cause price increases that will impact IT spending in the UK, Western Europe and even worldwide.
The research house has revised its 2016 IT spending forecast, which covers data centre systems, software, devices, IT and comms services, from minus 0.5 percent to zero, but this was done before the Brexit vote.
Research Vice President John-David Lovelock said: "2016 marked the start of an amazing dichotomy.
“The pace of change in IT will never again be as slow as it is now, but global IT spending growth is best described as lackluster.
"2016 is the year that business focus turns to digital business, the Internet of Things and even algorithmic business.