A cost effective alternate solution to ISDN that provides reliability, flexibility and continuity.


Zusi’s SIP trunks provide a highly flexible alternative to
ISDN and are compatible with all the leading IP PBX
brands in the UK market, giving you peace of mind that
your PBX hardware works with the network service.
Compared to ISDN, Zusi’s SIP trunks are cheaper on a per
channel basis and are more flexible in terms of what
telephone numbers you can have and the locations in
which you can have them. In addition, they are quicker to
install and offer a robust business continuity service that
ensures your business never loses any calls. Our service
can support connections ranging from two channels for
businesses with small PBXs, with no limit on the number
of channels that can be supported for large enterprises
and contact centres.


How Does it
Zusi’s SIP trunk connect your PBX to our network,
enabling full PSTN breakout on the public telephone
network. Connection from your site (or sites) to our
network is via an IP connection (for example fibre
broadband or Ethernet) and is delivered as an end to
end service with an availability guarantee, voice
channel guarantees and voice quality of service.
Using Zusi SIP Trunks, your PBX can be located at either your
premises, such as shown in the
diagram above, or could be housed within a managed co
location centre provided by Zusi where you don’t need to be
concerned about space, power or support engineers to look
after your PBX. Either scenario is possible and for added
resilience and flexibility you may wish to use a combination of
both support models. Zusi give your business the flexibility you
need to make the move from ISDN to SIP as easy as possible
for the way your business operates.


Who is SIP
trunking aimed
Zusi SIP Trunks are suitable for any size
of business from small businesses to large
enterprises and government organisations that
currently have a PBX, unified communications
solution or key system.


Benefits of SIP
It’s easy to get lost in the jargon of technology with people espousing
acronyms about features that may or may not make sense to you. So let’s try to narrow down the
features of SIP and how it can benefit your business.

1. SIP trunking supports business continuity
SIP trunking offers a flexibility that is not available
through traditional ISDN. A number of possibilities
can affect how resilient your voice and data
connections are. Unforeseen circumstances such
as damage to lines, moving offices or being unable
to redirect calls, can be damaging to your business.
SIP trunking minimises these problems and ensures
you can keep working through every eventuality.

2. Number flexibility
SIP trunking supports your business by allowing you
to decide which number you want to display on a call
by call basis. Even if you’re making a significant
move in location, or just wanting to grow your
business without opening more offices, SIP trunking allows out
of area geographic number ranges to be used
showing your business as local, despite being
physically located elsewhere.

3. SIP trunking saves you money
Why have a separate voice and data connection
when you can have both on one line? By discarding
any unnecessary ISDN lines, you will be able to
save a large amount of money. In addition, SIP
trunking can typically save you a further 50% on line
rentals and 25% on calls. By utilising the benefits
of SIP trunking number flexibility when you’re
moving office, you will not need to spend money on
changing stationery, advertisements or listings. SIP
trunking also allows you to make free calls between connected sites, even internationally.

4. SIP trunking offers greater flexibility
If you’re still using ISDN, the chances are that you
are spending money on lines that you may not
actually need all year round. SIP trunking gives you complete control of your lines
you can add more when demand is high, reduce them when there is
little demand and split calls to make handling more
efficient. Being able to make these instant changes
puts you in total control of your communications.

5. SIP trunking comes with a contingency plan
Often, things will happen that you just can’t control.
Whether that’s a problem in the office, busier peak
times than usual or a lack of connection, Zusi’s
SIP trunking business continuity feature is designed
to handle emergencies with ease. It is able to
automatically reroute any calls to back up sites in a number of seconds so there is no disruption for your customers.




The future is around the corner – 2025 will bring us Microwave Power Plants, the founding of U.S.R and the end of Integrated Services Digital Network (ISDN) and Public Switched Telephone Network (PSTN) services. So whilst the latter may not be as sensational as the rest, it still spells a fundamental change to the way UK organisations will need to operate.

So What does that mean for you?

In a nutshell, it means you won’t be able to order new ISDN or PSTN services in the UK come 2023, and in 2025 Openreach will cease to provide dial tones or power to the lines which all equals: No. More. Calls. We are working with Ofcom, communications providers, the Office of the Telecommunications Adjudicator (OTA), the Network Interoperability Consultative Committee (NICC) and trade bodies, to ensure where possible you experience a smooth migration.

What does that mean for you ?

Essentially, you need to start thinking of alternatives and changing the way your organisation communicates. There are options already available such as Voice over Internet Protocol (VoIP), which uses data networks to provide you with the same voice service but delivered in a slightly more modern way. It also means you can take advantage of more up to date collaboration tools.

Why is this happening?

Well, in the same way you probably wouldn’t rely on a car made over 30 years ago to get you to and from work every day, that’s pretty much what your voice traffic has been doing. Everything else has moved on – and now it is time for telecoms to catch up.

Do I have to wait?

Not in the slightest. Zusi has been deploying VoIP services for more than 6 years now (we said it is time for telecoms to catch up). So trust us when we say that the sooner you start considering your options, the easier the transition will be for your business to start taking advantage of the opportunities that solutions such as VoIP can bring.


To Speak to an expert click here.

Why Zusi?

  • Market Leading products
  • We have strategically partnered with the best BT , 3CX Virgin and more
  • Fail proof data centres across the world
  • 24/7/365 customer service and support
  • In house experts
  • Engineering force throughout the UK
  • Our first contact fix is 83% (industry standard 75%)
  • On site support
  • Expert account management

New North East Office

We are delighted to announce we have opened our North East office 1 Lingfield Way Yarm Road Business Park Darlington Co. Durham DL1 4QZ

New Roles at Zusi

Business Development Manager – Telecoms UK Wide £20 – £30,000 Base £50,000 OTE

You will be a talented Business Development Manager who is looking for a new challenge. Maybe the product range you sell is weak. Maybe the commission structure leaves a lot to be desired. Maybe you are chained to your desk day in day out. Does this sound like you? Make the change and join a company who are current and offer fantastic solutions to their clients.

Zusi are a complete telecoms solutions provider who offer an independent UK based service specifically to businesses. There is a huge focus on the excellent and dedicated service we provide to our customers. With our extensive support system in place, we are able to share our knowledge and expertise about all of our services, including business mobile phone services and business phone and internet packages. Growth is at a fast pace and so we are looking for individuals who wants to be part of this journey and grow as the brand expands. We are looking for experienced New Business Development Managers to join the team. Business Development Managers are responsible for new all business development activity across the UK. The role will be pivotal in building local and trusted relationships, with an initial focus within the small to medium enterprise market. As this is a mix between field-base sales and office, with the majority of your time expected to be field sales, a Full UK Driving Licence and ownership of your own car is essential. What are we looking for you to do?

Win new customers who require business telecoms solutions Find, Book and Attend face to face meetings or video meetings with prospective clients. Fully understand the client’s needs, presenting solutions-based proposals and quotations in line of theses. Build relationships to ensure referrals and repeat business. What do we need from you? You will be a true sales talent with experience selling VoIP, Mobile Services or Connectivity such as Leased Lines, FTTC, FTTP). This is a role that will see you spending more time out in front of clients rather than in the office. You will own the process from start to finish. To be a strong candidate for this role you will have proven B2B experience and the never say die attitude towards winning new business. Want to find out more?

Think this could be the role for you? Please email a recent CV to letstalk@zusi.co.uk and we will arrange a suitable time for a conversation.


Our Zusi Hosted Licence already comes with UC Business FREE, to allow your users to work remotely on up to 5 devices via their smartphone, tablet and computer.

The application allows Zusi Hosted seat users to make and receive calls just like they do in the office and offers much more!

As remote working becomes more and more important over the coming weeks, we have worked with our Hosted Voice Partner, BT Wholesale, and are pleased to offer UC Team FREE until 1st July 2020*.

The UC Team application enables Mobile Zusi seat users to fully collaborate and work more efficiently whilst out of the office. It offers all of the benefits of the UC Business application that is included for FREE already in the Zusi Hosted Seat licence and other essential features including:

– My Room Conference calling for up to 8 attendees

– My Room Collaboration Screen sharing for both internal and external parties

To learn more about remote home working and UC Business/UC Team, speak to Zusi today 01782409300 or letstalk@zusi.co.uk

Why Businesses Should Give Their Staff Used Mobile Phones

Providing employees with a mobile phone has become standard practice for many businesses. For staff working out in the field who need to stay in touch with clients and colleagues, for remote and home workers taking advantage of flexible modern working practices, for staff who are on call after hours, a company mobile is an essential part of their work equipment.

But the need to provide staff with mobile phones doesn’t mean you have to pay top rates for brand new devices. Used handsets for businesses provide a cost-effective, flexible alternative. Here are some of the key benefits.

Save money

The obvious appeal of used mobiles for business is the fact that they cost less than brand new handsets. For reconditioned and Grade A devices in a physical condition and working order which rivals an out-of-the-box new phone, you are typically talking about a saving of 33% compared to RRPs. Anywhere you can shave a third off CAPEX costs without compromising quality and performance is well worth considering.

Get better devices

Another way of looking at the better value offered by pre-owned phones is that it gives you an opportunity to invest in better standard models for the same price you would have been prepared to pay for new handsets. If your budget has always allowed you to stretch to mid-range models but no higher, the used market gives you an opportunity to upgrade to premium. Top-end smartphones will allow your staff to do more from their devices, and will also give them a sense of being rewarded with a high-performance gadget.

Choose the best value operator

As when you buy a mobile for your own personal use, many of the options available to business users are device-plus-network contract bundles which tie you into a particular operator for a fixed period of time. By buying second-hand phones, you free yourself from these long-term commitments and get the flexibility to choose whichever service offers best value. Pre-owned phones are sold unlocked so you can take your pick of SIM-only deals and change providers, should you wish to do so, on shorter cycles.

Shorten replacement cycles

Just as used phones give you more flexibility in changing providers, you can also think about changing or upgrading the handsets themselves more regularly without worrying about whether you’ve had full value for your investment. The cheaper an asset like a fleet of smartphones is, the quicker you get a satisfactory return on what you have spent in terms of amount of use etc. This is particularly good to know when you are fully aware that your devices are going to get heavy use out in the field and the risk of wear and damage is high.

Contribute to your sustainability policy

Finally, one reason the used phone for business market has grown so significantly in recent years that doesn’t always get the attention it deserves is the fact that buying pre-owned devices is much greener than always buying new. There has been a realisation that the mobile industry’s preoccupation with rapid new release cycles and heavily marketing new device purchases is highly wasteful, and has led to millions of perfectly good handsets being traded in. Choosing second-hand mobiles over new means you are making a positive contribution to reducing this waste and ensuring that more handsets get used for their full operational lifespans.

Energy Report January

Energy bills are driven by both the price of energy on the wholesale market and Third Party Costs (TPCs). TPCs include non-energy costs set by the government, network, policy and system costs and electricity transmission/distribution costs. 

The biggest single cost on a bill is the price of the energy. The wholesale cost of the energy makes up approximately 45% of an electricity bill and 65% of a gas bill, with the remaining being TPCs, which have been continuously rising in recent years and can be volatile.

This pricing report focusses on the energy element of a bill to help you keep track and understand the wholesale energy market and the factors affecting the price of your contracts.


A perfect storm of opportunity … as many of you will be aware the prices of wholesale energy had fallen back significantly in 2019, hitting a 3-year low of £35MW in the last week of December.

Following the assassination of a top Iranian official, General Qasem Soleimani, by the US on Iraq soil has exacerbated tensions in the Middle East and has already had a profound impact on oil prices, pushing them up to a seven-month high.

The massive uncertainty around the prospect of war is likely to significantly drive prices up even further in 2020, so our advice is to fix a renewal contract now while prices still remain favourable.

Bullish Factors (upwards pressure):

  • Fallout in the Middle East between US and Iran
  • The increasing rise in the price of oil
  • Reduction of Russian gas flows into Europe since the beginning of the Russia/Ukraine transit deal
  • Uncertainty around leaving the EU with a deal, Brexit is set for 31st January

Bearish Factors (downwards pressure):

  • Milder weather causing lower demand
  • LNG vessels arriving in the UK, to an already oversupplied system

Market Report

Gas and Power

Last week gas contract prices traded lower, pressured by bearish weather which led volumes of storage to build and a busy LNG schedule. This resulted in there being an excess of supply in the gas system, which helped to keep contract prices low. The windy weather helped to keep electricity contract prices low. Wind generation picked up and renewables helped to supply a larger share of the system and allowed it to be less reliant on gas and oil to generate power.

Following the trend across the board, the decrease in prices we had seen since last month was reversed after the US-Iran air strike. Electricity contracts increased in price, tracking the gains within the gas and oil market. The increase in gas prices was also fuelled by the reduction of Russian gas flows into Europe since the beginning of the Russian/Ukraine transit deal.

Brent crude increased last Thursday, bolstered by the US air strikes against Iranian backed Hezbollah which attacked an Iraqi military base, killing a US personnel.

Since then, Brent crude has continued to climb even higher in price, stoked by fears of a wider conflict within the Middle East following further US air strikes which killed General Qasem Soleimani, head of the Iranian Revolutionary Guards’ elite Quds Force.

This morning, Brent crude briefly touched $70.00/bbl with events in the Middle East being closely watched. Compared to the start of December, WTI has increased in price by 13.9% and Brent by 14.2%, with it expected to increase even further, with Iran vowing revenge for the killing of General Qasem Soleimani.

Current price standings:

Brent Crude = $69.67/bbl
WTI Crude = $63.87/bbl

Energy News

US-Iran Airstrike

Iran’s most powerful military commander, General Qasem Soleimani, was killed at Baghdad airport, along with other Iran-backed militia figures, early last Friday in a strike ordered by US President Donald Trump. He was the head of the Quds force of the Revolutionary Guard and often likened to a shadow minister.

President Donald Trump’s claim that the drone strike made Americans safer is being challenged by cascading events that have appeared to leave the US more vulnerable and isolated. Mr Trump said the general was “directly and indirectly responsible for the deaths of millions of people”. America’s top military officer said he is “100 percent” confident Qassem Soleimani approved the attack on an Iraqi military base at the end of last month that killed an American.

Soleimani’s killing marks a major escalation in tensions between Washington and Tehran and has set off fears of escalating retaliatory actions by Iran and the United States, and of a broader regional conflict. Iran promised “severe retaliation,” and many analysts fear a broader regional war. At a minimum, attacks on U.S. military installations in the Middle East are expected. 

Effect on Uranium Enrichment

Iran also said on Sunday that it no longer will comply with limits on uranium enrichment (which is used to make reactor fuel but also nuclear weapons) under its 2015 nuclear pact.

The agreement, known as the JCPOA, constrained Iran’s nuclear programme for a set period in a largely verifiable way. But its greatest significance – even more so given the current crisis – is that it helped to avert an imminent war. 

Donald Trump abandoned it in 2018 and Iran were expected to announce their latest stance on the agreement last weekend. If they up their level of uranium enrichment it would significantly reduce the time it would take to obtain suitable material for a bomb.

Effect on Oil Prices

Oil prices surged and stock markets in Asia fell on Monday morning, as the impact of General Suleimani’s death ricocheted around the world.

The sudden escalation in tensions in a region that supplies much of the world’s petroleum has roiled oil markets. The price of Brent oil, the international benchmark, jumped above $70 in futures trading as markets digested a steady flow of news over the weekend.

Analysts at Capital Economics have warned that the price of oil could spike to $150 a barrel if the bellicose rhetoric between the two countries turned into action.

“The price of oil would soar in the event of full-blown military conflict in the Middle East,” said Alexander Kozul-Wright, a commodities economist at Capital Economics.

The potential disruption to the global oil market from the conflict in the Gulf is severe. To ensure you aren’t affected by any potential surges in oil prices over the next coming weeks, lock in a price to secure your future contract now.

The Great Debate: SIP Trunking vs. VoIP

What is the difference between VoIP and SIP?

Firstly, let’s talk lingo. Often, we talk about VoIP and SIP as though they’re two totally different things but technically, they’re not too dissimilar.

When your customers ask about VoIP they are most likely asking for hosted seats, whereas when they ask about SIP, they usually mean SIP Trunking, as a direct replacement for ISDN. Hosted Seats use SIP signalling to initiate the session to send calls to an Internet Protocol (IP) provider. So, essentially, they do the same thing.

It all boils down to the equipment making the call and your customers’ needs and wants. Customers need to move to IP, but what do they want to buy?

A VoIP solution, as we’ve already mentioned is generally a hosted seat. Hosted seats are often sold in package deals, bundled with calls usage, which make them easy to buy and sell. These solutions can be extremely flexible and scalable, offering single or multiple user licenses, shiny new IP handsets and mobile or desktop softphone clients. IP handsets are plugged into a broadband router and/or Power Over Ethernet (POE) switches to provide a single line replacement to the PSTN line over some form or broadband connection.

Now, SIP, or as I prefer to call it SIP Trunking, is generally sold exclusively to business customers. When SIP was first launched it provided a ‘like for like’ ISDN replacement. Business customers would have an onsite system, known as a Private Branch Exchange (PBX), which would be serviced by ISDN channels, usually between 2 and 30. By using SIP Trunking, these businesses were able to simply replace their ISDN channels with SIP channels, retaining their existing PBX.

That’s the key difference between the two products: If our customer wants to keep their existing on premise PBX, they need to use SIP. If your customer wants to replace their PBX, they need VoIP.

Five advantages of hosted voice

With BT’s recent announcement that all ISDN’s will be turned off by 2025 hosted VoIP is the ideal replacement by providing a Hosted Centrex that replaces the traditional PBX.

1. Cost-effective

Here are the top reasons why you should switch to hosted voice today.
Switching to a hosted voice solution from your current phone system can be a big step for your business, but here are five advantages of doing so.

Money is everything in business so why waste it? Money is a primary concern for all businesses and being cost-effective is one of the highest priorities. However, if you’re still using a legacy phone system, you might not be making the best use of your time, your calls, or your money.
Most legacy phone systems charge for each minute spent on the phone and for international rates, those charges can almost double. And that’s without mentioning the unscrupulous charges and the uncertainty over what a business could be billed at the end of every month.
However, hosted voice can avoid those charges as hosted voice systems come with fixed minutes and a user plan. Put simply, this puts an end to cost concerns, meaning every month you’re billed exactly what you’re expecting, every time.

2. Flexibility

With your legacy phone system, chances are you overspent and added extras you didn’t really use or need. However, a hosted voice system allows you to buy what you want, whenever you need to use it putting an end to overspending.
The scalability of the system means that whenever your business wants to grow, you can add capability to the system when you need it. And, should you need to scale it back down if you’ve overestimated, the flexibility allows for that too.
Traditionally, phone systems presumed each employee had the same requirements and needs but the flexibility of a hosted voice system means customisation is easy and effective, ensuring each employee only has features they actually need depending on their job role within the business.

3. Consistency

Scalability is also linked to consistency; if your business has grown over time and more office locations have been added, they may have different phone systems interlinking which work in different ways. Ultimately, this can cause confusion with staff who may have to travel to other offices and, therefore get to grips with a new phone system before they begin their work.
Having different legacy phone systems can also make it difficult to easily transfer customer calls between sites, meaning customers are left waiting whilst staff grow frustrated and productivity is lost.
With the hosted voice system, every phone works in the same way, in every location. Whether staff are on the road, working at home or in an office, they will all have access to the same powerful range of features including room-based collaboration, conference calling and instant messaging which can dramatically improve the productivity of your business.
Add to this the integration of hosted voice with your IT system and its efficiency is evident. Its integration with major cloud-based CRM programmes and customer support applications make the experience not only more efficient for your staff, but also for your customers.

4. Mobility

It’s the 21st century and, the chances are, your workforce is becoming increasingly mobile and more and more staff members are working remotely.
However, a mobile workforce can often encounter its own problems with people feeling detached from the office and some often find it difficult as they don’t have access to the technology they would if they worked inside the office.
But with hosted voice, those problems mean solutions and being mobile doesn’t need to mean disconnection from the office. With cloud-based phone systems, wherever your workforce are they can connect to the core network of the business and use the technology just as they would if they were sat in the office. Being mobile doesn’t have to mean they’re remote.

5. Maintenance

If your phone system goes down, does your business shut down? If you’ve got a legacy phone system, the likelihood is that when things go wrong, you’ll call the engineer who might arrive in a few hours to get you back online.
But time is money.
With hosted voice, you’ll probably never have to ring the engineers again. Managing and maintaining your cloud-based solution is all done via the internet, with handy how-to’s showing you exactly how to solve almost any problem.
They’re designed to keep you running 24/7 so you can make and receive calls no matter what happens.


Why have a business phone when my personal one works just fine?

Whether you’re starting a new business, evolving your existing business or starting a new job, you’re probably asking yourself whether you need a business phone. Here are the arguments for moving to a business phone.

1. You need the right answer

‘Personal’ and ‘business’ are very different fields, which require mutually exclusive approaches.

Any business start-up owner or colleague in a new role is eager to spread his/her contacts as widely as possible, ultimately giving their details out like sweets.

The result is that your personal number, which you have protected carefully and only given to people you trust, is now public property. A call from a number you don’t recognise? Well, you can’t ignore those anymore. What if they’re a lead, or a customer? And how do you answer the call? With your personal greeting or your business one?

When you go home and are ready to unwind, the last thing you want is to receive an email that completely changes your mood. With two phones, you can put the job away by switching off the work phone, giving you a sense of control over what to do with YOUR time.

One of the core ideas behind a business mobile is preserving privacy without compromising accessibility.

2. You’re going to grow (at some point)

Sometimes an aspiring entrepreneur thinks: “My personal number will do for now. I’ll come up with something more professional later.”

When time comes to scale-up or step-up your business ― such as adding more lines, activating an answer machine or call-back service, or employing call forwarding ― an entrepreneur may find out that his/her consumer mobile carrier can’t offer the desired additional functionality. And once a business is evolving, changing a fundamental line of communication such as a main contact number can create a number of challenges, anything from upset customers or suppliers to reprinting all of your stationery. It’s far easier to make this decision before a business is established.

3. You need to take data security seriously

Protecting other people’s data is now a fundamental responsibility for any business, and every employee at a business. Failing to do so can cause any number of problems, the least being a breakdown of trust between customers, suppliers and your business.

Business accounts aren’t inherently more secure than personal ones but separating personal data and behaviours from business data and behaviours is essential when it comes to data protection.

4. You need to be on the same page as your people

By providing mobiles to your employees you have the choice of what network/carrier to use and the operating system that best fits your companies needs. You might want to decide to go with Apple iOS, Google or Android but whatever you choose if you keep the operating system’s consistent you’ll know that all your employees should have access to the same software and features.

5. You need to save money (and stay in control)

If you’re reimbursing employees for business use of their personal phones, you could be covering the cost of multiple individual rate plans. You’re more than likely to pay a significantly lower rate per phone if you have a business account for multiple lines with a single provider.

6. You need to know who’s talking

If your employees rely on personal phone numbers for dealing with customers, you willingly give up control over a certain part of your business. To plan for the future, it’s important to keep track of all business processes within your company, such as logistics, sales and customer service.

When clients interact with your company through employees’ personal numbers, you don’t know how often your employees speak to your customers, how they handle conversations and which questions they have trouble answering. Worst case scenario: when an employee who has been using their own phone leaves your company, your customers or suppliers could leave with them.

By giving your employees business mobiles you instantly gain more control as you’ll be able to monitor the way those phones are used. With a business contract you can monitor the use of voice, texts and data, place limits on overspend, add bolt-ons.

In a nutshell

A business phone number is a must-have for every entrepreneur, start-up or career-climber. Not only are they essential for separating your personal and professional lines of communication, business phone numbers are a great way to protect sensitive information and project the appearance of a larger, established company or seasoned pro.

How we can help

Whatever your business needs, Zusi has what it takes. We specialise in mobile, mobile broadband and hosted voice – everything you need to keep your business connected.

Our mobile tariffs are specifically designed for businesses, so they are different to those you get on the High Street. That means you get more choice, tailored tariffs, business-focused service, wide range of advance features and a contract that can grow with your business.