On-Premise Phone Systems

With solutions for small office telephone systems through to multi-site enterprise, we have a telephone system to fit every organisation with the latest Mitel phone system or iPECS phone system in cloud or on-premise PBX format.

"Thank you for all your hard work and assistance since Government Restrictions in March and now. We are extremely pleased with the service provided, it has been a challenging start to the contract none of us expected we would be facing this but we feel extremely pleased we made the right decision when we awarded the contract in January to Cavendish..."
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What is an On-Premise Phone System?

An on-premise phone system requires all the hardware for your phone system to be located in a safe place in your office. There are many people who are switching to hosted phone systems (cloud), but there are still many who prefer to have a physical box in their office. This solution provides more granular control and therefore peace of mind. You can upgrade whatever you want, customize it to fit your needs, and have complete oversight of everything.

iPECS Telephone Systems

iPECS Phone System

iPECS UCP is Ericsson-LG Enterprise’s unified communications platform designed to help organisations communicate and collaborate with all of their partners. iPECS Unified Communications helps people across your business be more productive and efficient regardless of their location or chosen device.

iPECS Unified Communications capability is built in to UCP. Users can use voice, video, instant messaging, conference calls and visual voicemail all on one simple and easy to use platform. UC is designed to be intuitive and provide your team easy to use tools and features.

iPECS UCP helps you to make the most of the latest network technologies, such as SIP, optimise call costs using WiFi or use in-built voice conferencing to save on external conference services.

Mitel Phone System

Cavendish has a direct and long-term relationship providing Mitel Telephone Systems, giving us vast experience in the complete range of Mitel Phone Systems. Whether a small business phone system, medium or large enterprise our own in-house engineers, fully trained to the latest accreditation, will configure install and maintain all our systems.

Modern business communications demand a host of tools, including desk and mobile phones, email, instant messaging, voicemail, presence information and audio, video and web conferencing. Bring these tools together in an integrated Mitel Phone System that facilitates seamless communications anywhere, any time over any device.

MiVoice 6900 Series
3CX Business Phone System

3CX Phone System

3CX is an open-platform office phone system that runs on premise or hosted in the cloud.  A complete omnichannel business phone system that eliminates the cost and management headaches of proprietary systems while offering a true remote working experience to any employee with an internet connection. Watch productivity soar with advanced call centre features, video conferencing and more.

Why choose an Office Phone System?


Increased Control

Accessibility of your server on-site means you can manage and configure your own phone system.

Office Cabling

Choice of Applications

The sophisticated systems can host a variety of additional applications to embellish your system.

Touch Screens


Applications can be tailored to suit your business needs.


Lower ownership costs

Pay for the initial installation, then it's yours forever, with no monthly payments.

More things to make life easier

Business Telephone Systems

IT Services

We can support, manage and monitor your Phone System, PC Desktop, Servers and much more!

Call Recording for Telephone Systems

Phone System Applications

Enhance your phone system with add-ons such as Call Recording, Reporting, Monitoring & more!

Non-Geo Numbers

Business Phone Numbers

Create a national presence for your business by providing customers with a free, memerable phone number.

ISDN Switch Off 2025

Security Protection

Defend your data and devices with dedicated protection for all of your business' intellect.

Call reporting

PC Applications

Embellish your PCs by installing the latest software to simplify day to day tasks for you and your employees.


Emergency Number Diversion

Temporarily divert your calls to another number in an event where your normal phone lines are not accessible.

Don't fancy an On-Premise Phone System?

customer service

Need more convincing?

Don't listen to us, listen to businesses like yours!