From Legacy Infrastructure to Fully Cloud-Optimised IT

How D8A helped Bryden Johnson Accountants transition to a secure, simplified, cloud-first environment—improving performance, security, and client communication.

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Overview

Bryden Johnson Accountants were referred to D8A IT Services by a specialist partner providing cloud desktop solutions for accountancy firms. The firm had already transitioned to a cloud-based Citrix desktop environment, but still relied on legacy on-premises infrastructure and an outdated telephony setup.

D8A worked alongside both the client and cloud provider to deliver a complete transformation, covering infrastructure, identity, network, and communications—fully aligning their IT with a modern, cloud-first model.

Key Facts

Cloud desktop environment (Citrix)

Full removal of on-prem servers

Active Directory → Entra ID migration

Network fully rebuilt and segmented

Teams Phone with Direct Routing

Automated call handling (Admin & Payroll)

The Challenge

Details on the challenge set before us by the client. The key issues and risks that needed to be considered by the D8A IT team.

Key Issues

• Legacy servers still providing DHCP and DNS
• All devices joined to an on-prem Active Directory domain
• Network not designed for secure cloud-first working
• External call answering service handling inbound calls

Key Risks

• Removing servers would break the network
• Removing Active Directory would stop user access
• Poor client experience through outsourced call handling

The Solution

Details on how we overcame the challenges set before us by the client.

Infrastructure & Identity

Migration of DHCP and DNS
Full transition from Active Directory → Entra ID
Complete removal of on-prem servers

Device Transformation

Rebuild of all laptops
Standardised setup across all users
Deployment of: Citrix Workspace, Microsoft Teams (optimised), Zoom (Citrix-compatible add-ins)

Network Rebuild

New internet connection
New routing equipment (including site-to-site VPN to cloud provider)
Reconfiguration of switching
Full cabinet repatching

Network Engineering & Organisation

All cabling tested
Faulty modules replaced
All patch panels relabelled
Colour coded system implemented

Network Segmentation

Management of network inc. restricted access
Set-up of private staff network with full system access
Set-up of guest network with internet only and no access to internal systems.

Telephony Transformation (Teams Phone)

Previous

Calls handled by external service
Calls transferred into Teams

New System

Migration to Direct Routing provider
Number porting completed

Call Handling Design

Day service implemented with three levels of call queues
Escalation routing
Voicemail fallback
Night service implemented which directs to voicemail

Advanced Features

Day vs night greetings
Voicemail to email
Voicemail transcription
Holiday routing
System allows for predefined dates
All calls routed to voicemail

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Services Delivered

Managed IT Support
Entra ID Migration
Device Rebuild & Standardisation
Network Infrastructure Design
Network Segmentation
Microsoft Teams Phone (Direct Routing)
Cloud Desktop Integration

Results

No reliance on on-prem systems
Fully segmented users (management, staff, guest)
Standardised device environment
Reliable Citrix access
Optimised Teams and Zoom
No external answering service
Faster response times
Structured call handling
Reduced complexity
Fewer systems
Easier support and management
Lower long-term cost

Before vs after

Before	After
Legacy servers running core services	Fully cloud-aligned infrastructure
Active Directory dependent devices	Entra ID joined devices
Mixed cloud and on-prem environment	Rebuilt segmented network
Outsourced call handling	Intelligent Teams Phone system
-	Automated call handling

How We Can Help Your Business

We assist businesses of varying sizes throughout London and the South East of England across a broad range of services. Need assistance just like those in this case study did?

If your firm:

• Uses cloud desktops
• Still has legacy servers or Active Directory
• Wants to improve security and system performance
• Has inefficient call handling

This type of transformation delivers:

• Simpler IT
• Stronger security
• Better client experience
• Lower long-term costs

Why Choose d8a?

Free Assessments

Discover opportunities for improvement with no initial cost.

Efficient Workflows

We streamline IT processes to save you time and boost productivity.

Consistent Service

Expect reliable support and performance, every time.

Free Consultation

Get expert insights tailored to your business, on the house.

Well Organised

Our team operates with precision, keeping every project on track.

Years of Experience

Decades of expertise guide our every solution.

What our customers say

Modernise your IT without disruption

Book a free discovery call and we’ll provide a clear roadmap tailored to your business.

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