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The ADSI VoIP FAQ is a collection of some of the most common questions.

If you’re unable to find the answer to your question or if there are any questions that you feel should be included in our FAQ then please email us with your suggestions on

Q: What Is VoIP?

A: In its simplest form, VoIP uses the internet to make a call instead of the traditional telephone network

Q: Why should I switch to VoIP?

A: Because VoIP is a hosted service, there are a range of features that may not be available as standard with a traditional phone line. From Hunt Groups to Availability Profiles, Instant conference calls to Busy Lamps, Automatic Schedules to Number twinning, there are a number of features available within the core system.

Q: Does hosted VoIP have any disadvantages?

A: VoIP is not perfect, and as such there are a few associated problems that need considering in comparison to traditional telephone service.

  • VoIP desk phones will not work in the event of a power cut, however these will default to disaster recovery rules such as forwarding to mobiles.
  • VoIP can suffer problems with call quality when not using an assured data service

Q: What is the minimum required to run VoIP?

A:  In order to have a working system, three main parts are required:

  • An internet connection capable of supporting the VoIP traffic
  • A subscription per user
  • A VoIP phone – This can be a physical IP phone, a PC client or a smartphone app.

Q: What are the bandwidth requirements for VoIP?

A: A VoIP call only requires 200Kbps of a sustained bandwidth for high quality calls, or 80Kbps for landline quality calls. You can quickly evaluate your connection with a free broadband speed test.

Q: How good is the VoIP call quality?

A: The quality of a VoIP call will be dependent on who you are calling, call a mobile, and you will receive a mobile quality call, call another VoIP phone however,  and you will receive a better quality of call.

Q: Is there any difference in making a call with VoIP?

A: As an end user, there should be no perceived difference in making a standard call, just pick up the handset and dial.

Q: Is there any restrictions on who I can call?

A: As with a normal phone, you can call anywhere in the world. However, the system does have the ability to block call types (such as international calls, premium rate etc.)

Q: What about receiving a call?

A: As with making a call, this is the same as a traditional phone system, simple pick up the ringing phone. If you are using a soft client, you will need to have your computer/mobile on and the soft client open in order to receive the call. Then you just have to click to answer.

Q: What is a Soft Client?

A: A soft client allows you to use an app on your smartphone or a program on your PC to make calls as if you were using your desk phone.

Q: Can I use my phone abroad?

A: Typically, so long as you can connect to an internet service that provides the required bandwidth with an RJ45 port, your phone will work abroad as if you are back in the office. For even easier access, the PC client will work wherever you can connect to the internet too!

Q: Can I port my number to VoIP?

A: Yes, you can transfer over from any provider that has a porting agreement in place.

Q: What if I move?

A: Hosted telephony works via the internet rather than being tied to your local BT exchange. Because of this, your phone will work at any location that has high-speed Internet.

Q: Anything to watch out for?

A: There are a few services that are incompatible or require additional products to enable their operation, such as:

  • BT Redcare Lines
  • Fax Services
  • Loud ringers/Paging systems

Q: Why should I choose ADSI VoIP?

  • Privately owned and debt-free, we have established ourselves as a leading Telephony services provider.
  • Hosted in two geographically (soon to be four) diverse redundant data centers.
  • Premium features included in the core package.


  • “The fact that we have kept our business with ADSI in such a  competitive market for such a long time speaks for itself really. Service is great always efficient. Clare manages our requests and queries promptly and efficiently with the bonus that she is always such a delight to talk to!”

    Aveat Heating
  • “We switched our telephone service from BT to ADSI and have been delighted with the service so far. Everyone we have had contact with has been helpful and professional and I wouldn’t hesitate in recommending them.”

    Lugano Residence
  • “I would like to thank Dave Cribbs from ADSI for advising and helping with the new VoIP system that we now use. This enables myself and my virtual assistant to answer every call we receive.  The increase in answered calls has led to more successful bookings.”

    Body Beliefs Osteopathy
  • “Since ADSI have taken over our mobile phone management we have not had a single issue. They have even dealt with an ongoing problem that we had been trying to resolve for over a year!

    Dave is always really helpful and responds to any queries we have quickly and efficiently. I would have no hesitation in recommending them.”

    HR Dept
  • “I would like to thank Dave and ADSI for making my Electricity switch over both effortless and at the same time lucrative.

    By signing just a couple of letters I have now switched and am saving over £100 pcm.

    I have no hesitation on recommending you and your company to friends and clients alike.”

    Quest Printing & Design Ltd
  • Energy: Simon introduced himself to us when he took over our account and has been friendly and helpful from the very first conversation. We have a couple of properties on the same street, some of which we had forgotten to inform ADSI of and we had got confused as to what was currently in contract/where we were paying high tariff rates.  Simon got this organised with minimal input from us which helped massively and also managed to save us money at the same time.

    I feel confident that our account is in safe hands which gives us one less thing to think about in the running of our business, I know Simon will be in touch as and when I need to know something. I would not hesitate to recommend ADSI Energy and have no intention of going elsewhere as I know they will do everything they can to get us the best deal possible.”

  • “We are now into our third year with ADSI and can only say what a BIG improvement on our previous provider.

    Calls are always answered promptly by a person, not an ‘option machine’.  Each time we have added a new connection the equipment has arrived on time.  Brad Foote has been our dedicated account manager and all it has taken is a quick phone call to action our requirements.

    Ongoing, our account manager keeps a watchful eye on our account and quickly highlights any unusual activity allowing us to address or amend our tariff accordingly. The technical support ADSI provides is also extremely helpful and timesaving.  I would have no hesitation whatsoever in recommending this company.”

    Almor Group
  • “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.

    Our account manager, Brad, at ADSI is faultless – I would highly recommend.  He helps with all queries and is knowledgeable, friendly and we feel confident that he gets us the best deal and give us the best advice.

    We have saved a considerable amount of money over the years and the control we have over our mobile phones now is second to none. Any issue or query is dealt with promptly and efficiently, can’t praise highly enough.”

    Fire Protection Ltd
  • “‘Welcome to the World of Mobile Technology’ ADSI form a vital part of our arsenal to allow us to get on with life.  They have been integral to our business growth providing a reliable and cost effective way to run an essential service to our company and staff who rely on constant communication.

    As a company and personally, ADSI know exactly who we are and our habits so can advise and manage our services honestly and precisely.  You have to enjoy working with suppliers otherwise what’s the point? It’s an honest, open and thorough relationship that we are very grateful to have in our business life.”

    Models 1
  • “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
  • “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 dealt with ADSI now for approx. 7 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 provided 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 by providing a pro-active service that lets me know if I need to make any changes to my mobile account.”

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