Who We Are

At Radicall, we acknowledge that our success is dependent on attracting businesses to utilise our services and products, it is why we have made it our mission to interconnect businesses by supporting the best solutions through our Worldwide Business Partners, and to provide a gateway to mutually inspire success in our customers businesses and essentially provide for a way to interconnect and share our success.

Our companies’ strategy is to establish a foundation of clients which can support our desire to recruit the people to our company that will be innovative, radically passionate, always be entrepreneurial and strive to exceed the expectations of the people we work with and the customers we serve."


Founding Director

Josko Sestan is the Founding Director of Radicall Limited. Having owned a number of businesses both here and in Australia. Radicall is a culmination of those experiences which included establishing a Payroll Service company in Australia, being a Business Consultant delivering Document Management Solutions. Gaining skills in the disciplines of software programming, installing client/server software, affecting business change management, training end users, providing project management and delivering complex solutions on time and within budget for some very prominent and demanding clients. Josko grew up in Auckland, New Zealand.  [read more...]


Business Consultant

Dennis Curin is a qualified Management Accountant who has worked in and owned New Zealand businesses in various commercial environments over the last 20 years. These have included businesses in manufacturing, wholesaling, retail and service sectors. Through his Consultancy Company he has worked with and advised many business owners on profit improvement strategies and techniques on maximizing the saleable value of their businesses. He fully understands the business environment and the key factors that drive potential business buyers. He is proud to bring a high quality business acumen, expert advice and professional approach to Radicall Limited.  [read more...]


Technical Advisor

An NZ independent telecoms professional with over 15 years telecoms experience. Simon is based in Auckland and has built an excellent reputation for engineering and maintenance, Simon has expertise and understanding of complete telecoms solutions built specifically around customers requirements. With highly trained engineering and maintenance teams, as a experienced telecom advisor expert in his field, Simon aims to deliver excellent service and quality assurance surpassing that of competitors. Simon prides himself in understanding kiwi businesses needs and requirements when it comes to telecommunications. With a heavy focus on service and support,  [read more...]


Senior Account Manager

Alex is passionate about the IT industry — its ever-changing nature, the fact that almost every day new products enter the market. He caught the ‘technology bug’ at 14. It was then that he began honing his IT skills by experimenting with old equipment that his father brought home from work. And, unlike many teenagers, Alex knew early on what he wanted in life. So, at just 16, he made the bold decision to leave high school to work in IT and study at Auckland’s Information Technology Training Institute (ITTI). As the face of Leading IT, Alex is the person you will most likely talk with. You’ll like him: He is a skilled communicator with the ability to translate technical language into plain English — a rare skill in the IT world. Of course, there are other things in life than IT. So, during his free time, Alex enjoys cars, fishing and travel.  [read more...]


Testimonial Heading
  • “Excellent service, prompt and efficient, we had our system down and you responded immediately, we were back up and running in no time at all, great service, thank you for your help!”
    MARION (North Shore Immigration)
  • Thanks Josko – that’s great!
    ADAM (Park Supplies Limited)
  • "All work complete and very happy with the results, thank you Josko, and pass my thanks on to your technician who did persever with the ever changing call flow designs we asked of him!"
    CHARLOTTE (Elusion Cigarettes New Zealand)
  • We would be happy to recommend Josko and his team to provide quick, efficient installation and support.
    Rex Bionics logo
    Carolyn Ambags


Small Business

  • Traditional Small Business PBX
  • VoIP-Based Small Business PBX
  • Unified Communications & VoIP PBX
  • Cost savings that can be achieved with a VoIP-Based PBX
  • Other Benefits of a Small Business Phone System

Medium Business

  • Help your business deliver better customer service
  • Leverage your existing infrastructure to reduce your overall cost of ownership
  • Make your business more competitive
  • Future proof your business
  • Other Benefits of a Small Business Phone System


  • Quality assured, Products & Services
  • Secure and robust network infrastructure, managed 24/7
  • Advanced IP PBX functions and features
  • Mobile solutions for remote employees
  • Call Centre applications, and bespoke integration services
  • Future proof solutions to scale up with your business growth
  • Streamline all communication and media platforms