Cloud PBX Phone System

So what is a cloud PBX phone system, and how does it work? A cloud PBX phone system is a type of phone system that uses the internet, or “the cloud,” to transmit calls and other communications. This allows businesses to make and receive internet calls rather than traditional phone lines.

There are many benefits to using a cloud PBX phone system for your business.

  • Cost savings: Because a hosted cloud PBX phone system uses the internet to transmit calls, it can be significantly less expensive than traditional phone lines. This can be especially beneficial for businesses that make a large number of long-distance, mobile or international calls.
  • Enhanced features: Many hosted cloud PBX phone system providers offer a variety of enhanced features, such as call forwarding, virtual receptionists, and voicemail, to help businesses improve their customer service and productivity.
  • Improved reliability: Hosted cloud PBX phone systems are generally more reliable than traditional phone systems, as they are less prone to disruptions and outages. This can help businesses avoid downtime and ensure that they are always able to stay connected with customers and clients.
  • Flexibility: Hosted cloud PBX phone systems can be easily configured and reconfigured to meet the changing needs of your business. This allows you to easily scale your phone system as your business grows.
  • Mobility: Hosted cloud PBX phone systems allow employees to make and receive calls from any location with an internet connection. This is especially useful for businesses with remote employees or those that need to make and receive calls while on the go.
  • Easy integration with other systems: Hosted cloud PBX phone systems can be easily integrated with other systems and technologies, such as customer relationship management (CRM) software and virtual private networks (VPNs). This allows businesses to streamline their operations and improve efficiency.
  • Simplified administration: Because a third-party provider manages hosted cloud PBX phone systems, businesses can save time and resources on the administration and maintenance of their phone system. This allows businesses to focus on their core operations and leave the management of their phone system to the experts without the need to have an on-site employee to manage the phone system.
  • Improved call quality: Because hosted cloud PBX phone systems use the internet to transmit calls, they can offer improved call quality compared to traditional phone lines. This is especially important for businesses that rely on clear communication with customers and clients.
  • Enhanced disaster recovery: In the event of an outage or disaster, hosted cloud PBX phone systems can provide a backup solution for businesses to ensure that they can still make and receive calls. This can help businesses stay operational and continue serving their customers.
  • Green solution: Hosted cloud PBX phone systems can be a more environmentally friendly option, as they eliminate the need for hardware and infrastructure that consumes energy and generates waste.

Disadvantages of using a cloud PBX phone system over an office-based PBX

  • Dependence on internet connectivity: A cloud PBX phone system relies on an internet connection to function, so if the internet goes down, the phone system will also be affected. This can be a concern for businesses that rely on constant communication with customers and clients.
  • Limited customisation: Cloud PBX phone systems may not offer the same level of customisation as an office-based PBX system. Some businesses may prefer the greater control offered by an office-based system.
  • Security concerns: Some businesses may have concerns about the security of their data and communication when using a cloud-based system. While reputable cloud PBX providers have measures in place to protect data, businesses may still have reservations about storing sensitive information in the cloud.
  • Lack of control: Because a third-party provider manages a cloud PBX phone system, businesses may feel they have less control over their phone system. This can be a concern for businesses that prefer to manage their own systems.
  • Initial cost: While a cloud PBX phone system can be more cost-effective in the long run, the initial cost of switching to a cloud PBX system may be higher for some businesses. This can be especially true for businesses that need to purchase new phones and other equipment to use with the cloud PBX system, such as headsets.


Ultimately, deciding to use a cloud PBX phone system or a traditional on-site PBX system using Sip Trunks will depend on your specific business needs and budget. Our team of experts can help you weigh the pros and cons of each option and choose the best phone system for your business.

Cloud phone system features

  • “Out-of-the-box” cloud phone system

    Our standard Hosted PBX package includes everything you need to run your phone system in the “cloud” through your internet or mobile data connection.

    Make & receive calls using either an IP phone or PC softphone, or via your mobile phone using our Luna app (iOS and Android).

  • Don’t pay for stuff you won’t use

    Unlike other Hosted PBX providers we won’t charge you for features you won’t use.

    But, as your business grows, you might want to add more advanced call management capabilities to your platform. Our suite of Hosted PBX features can be bolted on as and when you need them. So you only pay for what you’re using at any one time.

  • James Lester
    Director - Carpet Bright UK

    We’ve been using Numbergroup’s cloud-hosted communication platform since 2016. Their cloud phone system is reliable and easy to use, plus they have extremely competitive call rates, friendly customer service and faultless support. Our switch to Numbergroup saved us over £800 a year! We highly recommend Numbergroup to all our business partners and clients.

Features included in Basic Cloud Phone Package

  • Make & Receive Calls On Your Smartphone

    Use your mobile phone to make & receive business calls with our Luna PBX App. Keep your business and personal calls separate by displaying your business number caller ID. The ideal solution for busy freelancers and remote workers.

  • Transfer Calls Easily

    Transfer calls to other extensions or even different phone numbers, regardless of where you or your employees are located. Choose to do either a “supervised” transfer where a conversation can take place privately before the caller on hold is connected to the new destination, or a “blind” transfer where the call is transferred with no intervention.

  • Personalised Voicemail

    Record personalised voicemails for each member of your team. Allow staff to instantly retrieve and listen to call messages.

  • Choose Your On-Hold Music

    Entertain your callers with any music of your choice while they’re waiting to speak with you.

  • Automatic phone setup

    Setting up VoIP handsets can be a real hassle, especially if you’re not a techie geek. Let us auto-provision phones for you, so all you need to do is “plug and play”.

  • Flexible Conferencing

    Hold conference calls with staff on or off-site. Arrange board meetings between sites across the globe or invite your clients and suppliers to a conference call. Have the flexibility to configure any UK number for conferencing and ensure security by providing PINs to attendees.

  • Hosted Phonebook

    Save time & energy by adding important contacts within your group phonebook to ensure everyone within your organisation has access to important phone numbers.

  • Virtual Call Queue

    Receiving more calls than you can comfortably answer? Reduce call abandonment and frustration by placing waiting callers in a virtual queue where they can listen to music, find out queue position and be reassured their call will be answered.

  • Record Incoming & Outgoing Calls

    Record all or some of your incoming and/or outgoing calls. Includes the ability to pause a call recording and resume it, which is essential for PCI DSS Compliance if taking payments over the phone. We’ll also store your recordings securely for you to retrieve as and when required.

  • Voicemail to Email

    Get voicemail messages delivered to you by email as an MP3 file. Listen to voicemail message son the go without having to go through a complicated dial-in process.

  • Fax to Email

    Accept faxes without having to buy a fax machine. Choose any UK number to use as your fax number and receive faxes instantly by email as a pdf attachment.

  • Time of Day Routing

    Select different number translation and routing options for different times of the day on any day of the week.

  • Call Whisper

    Play a short audio prompt to the answerer of the inbound call announcing which number has been dialled.

  • Missed Call Notifications

    In the event of a missed call, we’ll notify you automatically by email. Choose to send to individual email addresses or a centralised mailbox.

  • Multi-level IVR

    Automate the process of directing callers to the correct department, site or give callers options to find out more about your business without having to use up manpower. We can create, upload and configure a professional bespoke IVR message of your choice.

  • Hunt Groups

    Distribute phone calls from a single telephone number to a group of several phone lines. Apply a weighted algorithm to select which line will receive the call.

  • Fraud Prevention Tools

    A suite of tools to monitor, detect and minimise potential telecoms fraud occurring on your account.

  • Call Analytics

    Get access to a suite of analytics that show you how each of your inbound numbers are performing. Use the data to refine your future promotional campaigns and get better ROI on your marketing spend.

  • Webhook Integration

    Connect your SaaS platforms to our portal via webhooks, allowing information to be automatically shared between both systems.

  • Dharmendra Tirdia
    Dharmendra Tirdia
    Ethos HR Management

    It’s been almost a year since we started using Numbergroup’s cloud services. Since the start they’ve made our lives easier by providing proper solutions, not just work-arounds. We’re in the recruitment business and telephone communication is the backbone of our business. I can’t say enough how relieved I am for choosing VoIP services from Numbergroup.

Make business calls from your mobile

Cloud Hosted PBX

Make Mobile Calls With Your Hosted PBX

Use your mobile phone to make and receive PBX calls on your Numbergroup PBX account.

Our “Luna PBX” app allows you to make and receive PBX calls via your mobile phone easily and securely without requiring any username or password. Once connected, your PBX users can:

Make and receive calls on your mobile handset using HD quality voice.

Put callers on hold and transfer them to colleagues, groups or conferences.

Automatically record calls to meet regulatory requirements.

Have outgoing calls appear from their extension’s phone number.

Android App Store
Cloud Hosted PBX

Performance & Security Features

Our “Luna PBX” client utilises push technology so can run in the background without affecting battery performance. Wi-Fi or 3G connectivity is required to make and receive calls.

All calls are encrypted on our platform for security, and only customers are able to access their recordings.

To add an extension, simply scan a QR code given out from our portal using the phone’s camera. Administrators can download these QR codes and send them to users via email.

iOS App Store

Grandstream DP720

SKU: DP720


In stock

The Grandstream DP720 cordless IP phone is a DECT cordless VoIP phone supported by Grandstream’s DP750 DECT VoIP base station.

Grandstream GXP1625

SKU: GXP1625


In stock

The Grandstream GXP1625 is an IP Phone that is perfect for small businesses.

60 in stock

View more details

The Grandstream GXP1625 is an IP Phone that is perfect for small businesses. Professionals can enjoy HD audio on both speakerphone and handset and a clear 132 x 48 backlit graphical LCD display. Other great features include 2 SIP accounts and 3 XML programmable context-sensitive soft keys.

Grandstream GXP2135

SKU: GXP2135


In stock

The Grandstream GXP2135 is an enterprise-grade IP phone that supports Gigabit speeds and up to 32 virtual BLF/speed-dial keys, making it ideal for busy call centres.

83 in stock

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The Grandstream GXP2135 is an enterprise-grade IP phone that supports Gigabit speeds and up to 32 virtual BLF/speed-dial keys, making it ideal for busy call centres. This Enterprise IP Phone features up to 8 lines/line keys and 4 SIP accounts using a 2.8 inch colour display LCD and full HD audio. The phone supports the fastest possible connection speeds with dual Gigabit network ports, integrated PoE and includes built-in Bluetooth for syncing with mobile devices and Bluetooth headsets. The GXP2135 is the perfect choice for business users looking for a powerful and reliable IP phone with advanced functionality.

Grandstream GXP2170

SKU: GXP2170


In stock

Grandstream’s most powerful Enterprise IP phone, the GXP2170 supports up to 12 lines and 6 SIP accounts.

97 in stock

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Grandstream’s most powerful Enterprise IP phone, the GXP2170 supports up to 12 lines and 6 SIP accounts. It’s ideal for users who handle call volumes as it includes 48 on-screen digital BLF/speed-dial keys and supports up to four of Grandstream’s GXP2200EXT Module. The GXP2170 also features built-in Bluetooth, PoE, 5-way conferencing and more.

Grandstream GXV3380

SKU: GXV3480-1


In stock

The Grandstream GXV3480 is a state-of-the-art IP video phone running Android 11 and offers instant access to hundreds of thousands of Android apps.

35 in stock

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The GXV3480 IP Video Phone for Android combines a 16-line IP video phone with a multi-platform video conferencing solution and the functionality of an Android tablet to offer an all-in-one communications solution. The phone features an 8″ 1280×800 capacitive touch screen IPS LCD, 2 Megapixel camera, dual microphone, dual Gigabit ports with PoE/PoE+, HD audio and HD video, integrated Wi-Fi 6 (802.11 a/b/g/n/ac/ax) & Bluetooth 5.0, rich peripheral interfaces350