01268 495555

Fixed Lines and VOiP

Fixed Lines and VoIP to suit your business today and tomorrow…

At ADSI we offer a full range of highly competitive Fixed Line & VoIP Telecommunications.

Our tailored solutions are aimed to minimise costs and maximise efficiency for your business and our full Account Management proactively seeks to advise and project manage installations or moves to make sure that sites go live on time and with minimum disruption.


We offer a wide range of fixed line telecoms to suit your business. Each solution will be fully managed and your personal account manager will carry out periodical reviews of your bills ensuring that the tariffs on are still the right ones for your business needs. For further details please contact us.


ADSI VoIP is an award winning, reliable and inexpensive advanced cloud based telephone service. Our product is extremely flexible and specifically designed for small to medium businesses

What is VOiP?

VOiP is a telephone system that will work anywhere across multiple sites and is completely provided and configured by us to suit your company requirements, taking away the burden of your telecoms from your IT team.  As well as giving your organisation access to low-cost and free IP calling, the system puts a huge range of smart call management features at your fingertips, with many bundled into the core package. Mobiles and other devices can also be integrated, meaning that your staff can answer or make calls from anywhere in the world, all through your office numbers.

ADSI will host and manage your telephone system according to your business needs, employees can then manage their calls easily and effectively, so maximising individual productivity.

Anyone can use ADSI VOiP – you could be a brand new start-up simply needing a new phone number, a growing business needing a flexible way of supporting new staff or homeworkers, an established business needing to replace an obsolete office PBX or switchboard.

Click here for adsi-voip-brochure

NEW ADSI VoIP just £19.95* a month, includes;

  • Selected Polycom handsetvoip
  • Free calls – 4000 minutes**
  • Free divert
  • Fully managed service
  • Handset mobility

*prices exclude VAT based on 60 month contract using third party access; conditions apply, offers may be withdrawn at any time. **4000 minutes include 2000 minutes to UK geographic numbers, 2000 minutes to 4 main UK mobile carriers

Ask a member of our VOiP team for full details and to arrange a site visit to discuss your fixed line telecom requirements

If you are looking for fast, reliable Broadband connection for your business click here –  Business Broadband solutions

Ask our sales team for full details on our fixed line telecommunications call 01268 495555 or email

  • “Always been very happy with ADSI from day one. We get contacted constantly by other companies but we would never leave ADSI as the service is fantastic and our Accounts Manager is brilliant – he helps with all queries and is knowledgeable, friendly and  we feel confident that he  gets us the best deal. Many companies we’ve used over the years have been in it for the money only but with ADSI we feel that they really do put the customer first, can’t praise highly enough.”

    East Durham Community Transport
  • “Our account manager makes this otherwise stressful task of the comms pain free. We receive a personalised service and he is always on hand to advise us on maximising our telecoms whilst keeping an eye on budgets, all without compromising the high level of standards we have come to expect.   Because of this we have moved all our mobile needs to ADSI which goes against normal company policy where we by principle never use a sole supplier.”

  • “ADSI provide an excellent service and value for money”.

    Southend Christian Fellowship
  • “Thanks for being the perfect comms partner over the last 13 years.”

    Jelf Group
  • “I would just like to thank you for all your help over the last couple of months. I admit that I was hesitant at first but the service level of ADSI, your professionalism and expertise has been second to none. I would not hesitate to recommend your services to other business colleagues I know. I look forward to our on-going working relationship.”

    AM World UK
  • “We are really happy with overall service from ADSI; it’s great to have someone assigned to our account that can help us with any issues. Our overall phone costs have greatly decreased and we are extremely happy with ADSI.”

    McCue Corporation
  • “We have been with ADSI for a number of years now and I wouldn’t go anywhere else. Very professional company.”

    Kevin Locke Builders
  • “I am extremely pleased that I moved our account to ADSI and would gladly recommend them. We have made considerable savings by making the move, but have also enjoyed a far better level of service. In fact the best thing about working with ADSI is having a named account manager who deals with everything about the account. “

    Association of Teachers & Lecturers
  • “My Account Manager is extremely good at alerting us to areas where we could potentially save money within our business. We are more than happy with the service we receive from ADSI & I would strongly recommend them to other individuals or businesses.”

    Trans XL
  • “We have dealt with ADSI now for approx. 5 years, and have been continuously impressed with the good old fashioned level of customer service. Not only do they keep their eye on our account to make sure it’s the best value for us and offer us great deals on new products, but the back-up is second to none. I would have no hesitation in recommending them to business colleagues. Keep up the good work!”

    Pink Scaffolding
  • “ADSI offer a personal service delivered in a very professional way.  I am very satisfied with the service and support provide by ADSI.  I am confident that when I call, my questions will be answered without delay and this is delivered at a very competitive price.  ADSI look after their customers be providing a pro-active service that will let me know if I need to make any changes to my mobile account.  I am free to concentrate on other aspects of my business because ADSI are looking the mobile accounts.”

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