Exertis is offering the full range of Mitel's UC&C solutions to UK resellers. It was previously a distributor for ShoreTel which was acquired by Mitel last year.
Gareth Bray, Head of Commercial, Enterprise at Exertis said: "We are seeing significant growth in UC solutions across all business verticals, driven by the requirement for more comprehensive digital collaboration and interaction with customers.
"With SMB and enterprise partners adopting on-premise and hybrid, private cloud, solutions that use multiple technologies and applications, there is a great opportunity for our resellers to engage with us."
Denise Bryant, Distribution Director, International at Mitel, added: "More and more customers are looking to embrace advanced unified communications and collaboration to increase their productivity and enhance their customer experience.
"Extending our partnership with Exertis represents a mutual opportunity to broaden our customer reach in the UK."