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OPUS BUSINESS SYSTEMS LIMITED

Gamma Cloud Voice Services – Unified Communications (UC)

Cloud Voice Services – Unified Communications (UC) is a resilient cloud‑based voice and collaboration platform hosted across Gamma’s UK data centres. It unifies telephony, messaging, conferencing, IVRs, hunt groups, call recording and administration into one service. Administrators manage everything through a secure web portal, with built‑in call statistics and support.

Features

  • Secure web portal for full system administration control.
  • Real‑time call statistics for inbound and outbound usage.
  • Interactive voice response for user self‑service management.
  • Voicemail with unified access and configurable email delivery.
  • Twinning to link desktop extensions with mobile devices.
  • Hot desking with login and timeout controls.
  • Call recording management with configurable storage options.
  • IVR, hunt groups, and ACD group management.
  • Sequential ringing using customised ‘find me’ lists.
  • QoS‑enabled dedicated voice network connectivity options.

Benefits

  • Manage telephony settings easily through a secure web portal.
  • Improve decision‑making using real‑time call statistics dashboards.
  • Handle calls efficiently with IVR self‑service options.
  • Access voicemail flexibly with unified, configurable delivery options.
  • Work seamlessly by linking desk phones with mobile numbers.
  • Support flexible working through hot‑desking login capabilities.
  • Enhance compliance using centralised call‑recording management.
  • Route calls intelligently with IVRs, hunt groups and ACDs.
  • Stay reachable anywhere using sequential ring workflows.
  • Maintain call quality through QoS‑optimised voice connectivity.

Pricing

Service documents

Request an accessible format
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Framework

G-Cloud 15

Service ID

1 0 5 8 2 9 8 2 6 5 2 5 4 8 3

Contact

OPUS BUSINESS SYSTEMS LIMITED Jenny Critchfield
Telephone: 02085457121
Email: bid@opustech.co.uk

About your service

Service categories

Applications

Collaborative

  • Enterprise community
  • Team collaboration
Multi cloud support
Yes

Service scope

Software add-on or extension
No
Cloud deployment model
Public cloud
Service constraints
The service must run on a voice‑ready network with sufficient bandwidth and supported codecs. QoS‑enabled connectivity may be required for optimal performance. Supported devices must be from the approved list to ensure compatibility. Routine platform maintenance may cause brief service interruptions. Guest access and some browser‑based features have limitations, such as plugin requirements for screen sharing. SIP and STCM features depend on correct PBX or SBC configuration, including routing logic and IP settings, to ensure full functionality.
System requirements
  • Voice‑ready network with sufficient bandwidth for concurrent calls.
  • Support for required codecs: G.711, G.729, G.722.
  • Compatible SIP‑enabled PBX or SBC configuration in place.
  • QoS‑enabled connectivity recommended for optimal call quality.
  • Approved handsets, headsets, or soft clients for device compatibility.
  • Modern web browser for accessing administration and user portals.
  • Correct routing and IP configuration for SIP and STCM features.
  • Secure network environment supporting encrypted signalling and media.
  • Sufficient server and network capacity for call recording storage.
  • User authentication managed via supported credential and access controls.

User support

Email or online ticketing support
Yes
Support response times
Alongside 24/7 telephone assistance, we provide convenient email support. During core hours (08:30–17:30, Monday–Friday, excluding bank holidays), buyers can report issues to customerservice@opustech.co.uk. On receipt, our Operations Service Desk logs the ticket in our Incident Management System, assigns priority, and sends an automated confirmation with your reference and details. From there, a technician begins triage and investigation, escalating seamlessly through first to fourth line if required. For critical P1 incidents outside core hours, we only accept phone calls so we can engage immediately. Responses adhere strictly to your contracted SLAs and performance targets.
User can manage status and priority of support tickets
Yes
Online ticketing support accessibility
EN 301 549
Phone support
Yes
Phone support availability
24 hours, 7 days a week
Web chat support
Yes
Web chat support availability
9 to 5 (UK time), Monday to Friday
Web chat support accessibility standard
EN 301 549
Web chat accessibility testing
Opus is currently running formal assistive‑technology user testing on our Service Desk online chat, the platform has been designed with accessibility in mind. Features such as browser‑based access, clear navigation, and compatibility with standard assistive tools (including screen readers and keyboard‑only navigation) support inclusive use. We continually review accessibility requirements and are committed to engaging assistive‑technology users in future testing cycles to further enhance usability and ensure a fully accessible support experience.
Onsite support
Yes
Support levels
Opus provides a flexible, scalable support model designed to meet the operational needs of organisations of all sizes. Core Business Hours Support (08:30–17:30, Monday–Friday) includes incident reporting via telephone, email, portal, or webchat, with all issues logged and prioritised using a P1–P4 severity framework. For customers requiring higher resilience, 24/7 support is available, ensuring rapid engagement for critical P1 faults and seamless escalation through multi‑level engineering teams.

Support can be delivered as Fully Managed or Co‑Managed, with optional services such as monitoring, release and update management, antivirus administration, supplier coordination, and change control. Pricing is fully tailored and based on the number of users and the level of cover required, allowing organisations to select an appropriate package without over‑committing resources.

Every customer benefits from a dedicated Account Director to oversee service delivery and a Solution Architect to ensure technical alignment and design assurance. Service Managers can be added where enhanced governance, regular service reviews, and deeper operational oversight are required. All services are supported by defined SLAs, transparent incident handling, and cloud and telephony expertise to ensure reliable, end‑to‑end performance for business‑critical communications.
Support available to third parties
Yes
AI chatbot
Yes

Onboarding and offboarding

Getting started
Our service provides several structured ways to help users begin using Cloud Voice Services – UC effectively. Users receive access to a secure web portal that enables them to manage sites, users, devices, schedules, call flows, and security settings, giving administrators immediate hands‑on control through an intuitive browser interface.

End users are supported through a dedicated end‑user portal, allowing them to manage call handling, voicemail, profiles, speed dials, and hot desking, helping them get productive quickly.

Training and onboarding are reinforced by specialist-led sessions, delivered either onsite or remotely. Customised training is routinely provided, including role‑based sessions for end‑users, supervisors, and administrators, with hands‑on practice using real user accounts. Training may be delivered in focused 1.5‑hour sessions and scaled across multiple groups per day.

Alongside training, we also provide guidance materials, including system screenshots, scenario‑based learning content, and user documentation tailored to each customer’s deployment. This helps ensure smooth adoption and reduces support dependency as users begin working with the service.
Service documentation
Yes
Documentation formats
PDF
End-of-contract data extraction
When a contract ends, customers can extract their data directly through the portals before service deactivation. The Unified Communications (UC) solution provides administrators with a secure web portal where they can export key datasets including call logs, call history, call recording files (where enabled), user configurations, numbering information, hunt group setups, IVR settings, and device assignments. The portal provides inbound and outbound call statistics and call log histories that can be downloaded for auditing or retention purposes.
End-of-contract process
Opus recognises that every partnership may eventually conclude, and we ensure this phase is managed with the same professionalism as all others. Our Exit Management Plan is designed to deliver a smooth, transparent transition that protects both parties—financially, operationally, and reputationally—while maintaining service continuity.

We will work closely with  Buyers to minimise disruption and coordinate a seamless handover. Opus maintains an up-to-date inventory of communication assets and service levels, enabling us to create a tailored exit plan covering phased activities, resource allocation, and responsibilities.

A dedicated Exit Transition Manager from our Professional Services team will oversee the process, coordinating with  the Buyer, suppliers, and internal teams, providing consistent updates through to full contract closure.

The exit plan will define roles and responsibilities, maintain ongoing service until cessation, outline post‑cessation support, detail work‑in‑progress, manage asset return, and ensure full documentation and data transfer. It will also cover phased decommissioning, risk and issue management, knowledge transfer, and regular progress reporting.

By following this structured approach, Opus ensures minimal disruption, clear communication, and a well‑managed, professional conclusion to our partnership.
Documentation accessibility standard
None or don’t know
How the documentation is accessible
Our onboarding and offboarding documentation is designed to be accessible to all users, including those with disabilities. All materials are provided in digital formats compatible with assistive technologies, such as screen readers, ensuring visually impaired users can navigate and comprehend content effectively. Documents follow a clear, consistent structure with headings, bullet points, and descriptive links to improve readability and navigation. Colour contrasts, font sizes, and spacing are chosen to support users with visual impairments or dyslexia. Alternative text is included for all images, diagrams, and screenshots, allowing users who rely on screen readers to access visual information. Additionally, we provide guidance in plain language to reduce cognitive load and ensure comprehension across a broad audience. For users requiring further accessibility accommodations, such as audio versions or Braille copies, these are made available on request. By combining digital compatibility, structured formatting, descriptive content, and alternative formats, our documentation meets recognised accessibility standards and supports inclusive access throughout the employee lifecycle. This ensures that every team member can successfully engage with onboarding and offboarding processes regardless of ability.

Using the service

Web browser interface
Yes
Supported browsers
  • Microsoft Edge
  • Firefox
  • Chrome
  • Safari
  • Opera
Application to install
Yes
Compatible operating systems
  • Android
  • IOS
  • MacOS
  • Windows
Designed for use on mobile devices
Yes
Differences between the mobile and desktop service
The desktop service offers the full feature set, including advanced call handling, admin tools, reporting, and better performance for long sessions. It’s ideal for office or power users.

The mobile service focuses on core calling and messaging features, with a simplified interface optimised for touch and smaller screens. Some advanced admin and configuration features may be limited or unavailable on mobile.
Service interface
Yes
User support accessibility
None or don’t know
Description of service interface
The service interface is a secure web-based portal that lets both administrators and individual users manage the service.

What it provides

Admin interface: configure and manage numbers, users, call groups, schedules, hunt groups, IVRs, music on hold, call barring, and more.
User interface: users can access and change their own settings (e.g., voicemail, call forwarding) and view activity.

Dashboard & tools: activity overview, navigation menus for calls, messaging and telephony functions.

This interface is central to configuring and operating the service and is accessible via supported web browsers.
Accessibility standards
None or don’t know
Description of accessibility
The service provides a web‑based and mobile interface designed with accessibility in mind, following WCAG 2.1 A guidelines. Users can navigate the service via keyboard, screen readers, and standard browser accessibility tools. Core functions—calling, messaging, voicemail, and basic configuration—are operable across supported desktops and mobile devices. While advanced admin features may be more suited to desktop use, the interface ensures essential telephony and collaboration tasks remain accessible. EN 301 549 and WCAG 2.2 are not currently certified. Accessibility may vary with device, browser, or app version, so users are encouraged to use up-to-date platforms for the best experience.
Accessibility testing
There has been no formal testing of the Gamma Horizon interface with users of assistive technologies such as screen readers or other assistive tools. One service description explicitly states that no interface testing with users employing assistive technology has been conducted.

Other listings indicate that accessibility testing is in progress or part of ongoing development. While practical trials with assistive technology users are not yet documented, product development forms part of a continuous improvement approach, and user feedback—including accessibility considerations—is actively used to guide future enhancements and improve user acceptance.

Implication
Although the service has not reported results from practical trials with people using screen readers, magnifiers, or voice control software, the design process incorporates accessibility awareness and continuous improvement to ensure the interface evolves to better meet user needs.
API
Yes
What users can and can't do using the API
API Availability

The service provides an API that allows automation and integration with external systems.

There is API documentation available (typically provided in PDF).
A sandbox or test environment exists in some implementations to support development and testing.

What the API Can Be Used For

The Horizon TAPI driver is provided as middleware for telephony and call control integration, typically invoked by CRM systems or desktop applications.

This integration does not itself provide end‑user features, but enables call control and integration workflows through compatible applications.
API documentation
Yes
API documentation formats
PDF
API sandbox or test environment
Yes
Customisation available
Yes
Description of customisation
The service allows users to personalise key aspects of their telephony and collaboration experience through the web portal or mobile app. Users can manage:

Call handling: Set call forwarding, do-not-disturb, simultaneous ringing, or call barring.

Voicemail: Record greetings, manage inbox settings, and configure notifications.

Presence & availability: Update status, define working hours, and manage presence visibility.

Messaging & collaboration: Control chat settings, notifications, and integration with supported apps.

Call groups & hunt groups: Join, leave, or adjust participation in groups as allowed by admin.

Contact management: Personalise speed dials, favourites, and directory access.

Interface preferences: Configure basic display and notification settings for desktop and mobile apps.

Advanced administrative or system-wide settings—like adding users, configuring IVRs, or managing numbers—are generally restricted to admins.

The platform supports continuous improvement, with updates informed by user feedback, helping to expand customisation options and enhance user acceptance. Overall, the solution balances essential user control with centralised management to maintain consistent service quality.

This ensures users can tailor their experience while keeping core telephony and collaboration features reliable across devices

Scaling

Independence of resources
The platform prevents one user’s demand from affecting others through dedicated capacity allocation, ensuring each customer has sufficient resources. Ongoing capacity planning monitors usage against forecasts to scale ahead of demand. A distributed, resilient architecture across multiple data centres maintains high availability and reduces risk from spikes or failures. Continuous monitoring of network and service health allows rapid detection and resolution of issues. Traffic management during busy periods further preserves performance. Together, these measures ensure that individual user activity does not degrade service quality for others, maintaining consistent performance across the platform.

Analytics

Service usage metrics
No

Resellers

Supplier type
Reseller providing extra support
Organisation whose services are being resold
Gamma

Staff security

Staff security clearance
Other security clearance
Government security clearance
Baseline Personnel Security Standard (BPSS)

Asset protection

Knowledge of data storage and processing locations
Yes
Data storage and processing locations
United Kingdom
User control over data storage and processing locations
No
Datacentre security standards
Supplier-defined controls
Penetration testing frequency
At least once a year
Penetration testing approach
‘IT Health Check’ performed by a CHECK service provider
Protecting data at rest
Physical access control, complying with another standard
Data sanitisation process
Yes
Equipment disposal approach
Complying with a recognised standard, for example CSA CCM v4.0, CAS (Sanitisation) or ISO/IEC 27001
Data sanitisation type
  • Deleted data can’t be directly accessed / Cryptographic Erasure
  • Data Erasure
  • Explicit overwriting of storage before reallocation / Secure Erase
  • Physical Destruction / Hardware containing data is completely destroyed

Data importing and exporting

Data export approach
Users export their data through the Unified Communications (UC) solution’s web portals. Administrators can download call logs, call statistics, user configurations, numbering information, hunt group settings, and IVR details directly from the admin portal. Call recordings (where enabled) can also be downloaded during their retention period, and voicemail messages are exportable via email. For large‑scale or bulk extraction, such as extensive recording archives or full historical reporting, organisations can request assistance from the service desk to securely export remaining data before the contract ends.
Data export formats
  • CSV
  • Other
Other data export formats
  • Excel (.xls/.xlsx)
  • PDF (Portable Document Format)
Data import formats
Other

Data-in-transit protection

Data protection between buyer and supplier networks
  • Private network or public sector network
  • TLS (version 1.2 or above)
Data protection within supplier network
TLS (version 1.2 or above)

Availability and resilience

Guaranteed availability
The service offers a high-availability SLA, guaranteeing 99.9% uptime for core systems, measured across planned and unplanned downtime, excluding scheduled maintenance notified in advance.

If availability falls below the guaranteed level, users can report incidents through the support portal. Major outages are reviewed with affected customers, and corrective actions are implemented to prevent recurrence.

This SLA ensures that customers can rely on the service for critical operations, with clear accountability if performance targets are not met.
Approach to resilience
Available on request.
Outage reporting
During an outage, Opus ensures customers receive clear, timely, and proactive communication to maintain confidence and minimise disruption. As soon as an incident is detected or reported, customers receive an automatic email acknowledgement confirming that the issue has been logged. This notification includes the assigned severity level and the corresponding SLA response thresholds, ensuring users understand the urgency and expected handling of the outage.

Throughout the investigation, Opus technicians provide regular progress updates, keeping customers informed of diagnostic findings, any identified root causes, and the steps being taken to restore service. This continuous communication ensures transparency and helps customers plan around the disruption.

Customers can also track the live status of their outage via the Opus Customer Portal, which displays real‑time incident information, current severity, timers, and any updates posted by the support team. This self‑service visibility means users are never left waiting for manual updates and can access the latest details whenever needed.
Together, these communication channels—automated notifications, technician updates, and real‑time portal visibility—ensure that Opus keeps customers fully informed throughout every outage, supporting effective service management and maintaining trust.

Identity and authentication

User authentication needed
No
Access restrictions in management interfaces and support channels
Access to management interfaces and support channels is controlled through role-based permissions and multi-factor authentication, ensuring users can only perform actions necessary for their role. Sessions are timed out after inactivity, and login attempts are monitored for unusual activity. Support requests are verified before sensitive changes are made. All access and actions are logged and audited regularly to detect misuse. These measures ensure that only authorised personnel can manage services or receive support, protecting system integrity and safeguarding customer data.
Access restriction testing frequency
At least once a year
Management access authentication
  • Multi-Factor Authentication (MFA)
  • Username or password
  • Other
Description of management access authentication
Management access is secured using unique credentials combined with multi-factor authentication (MFA). Role-based access controls ensure users can only perform actions permitted for their role. Idle sessions are automatically timed out, and repeated failed login attempts trigger alerts or account lockouts. All login attempts and management actions are logged and audited to detect and respond to suspicious activity. These measures ensure that only authorised personnel can access and manage the service, maintaining security and protecting customer data.

Audit information for users

Access to user activity audit information
Users have access to real-time audit information
How long user audit data is stored for
User-defined
Access to supplier activity audit information
Users contact the support team to get audit information
How long supplier audit data is stored for
User-defined
How long system logs are stored for
At least 12 months

Security governance

Named board-level person responsible for service security
Yes
Security governance certified
Yes
Security governance standards
ISO/IEC 27001
Information security policies and processes
Opus and Gamma follow robust, independently audited information security frameworks designed to protect customer data, ensure service integrity, and maintain regulatory compliance.

Opus operates a fully certified Information Security Management System, holding ISO 27001, ISO 9001, ISO 14001, Cyber Essentials, Cyber Essentials Plus, and NHS DSPT (Standards Exceeded). Its security policies include Information Security, Risk Assessment, Data Classification, Data Retention, and Incident Response. Opus conducts annual risk assessments aligned to ISO/IEC 27001, maintains documented IT security procedures, and follows structured processes for incident recording, escalation, continual improvement, and business continuity in accordance with ISO/IEC 27002 and ISO 22301.

Gamma follows a formally governed, ISO/IEC 27001‑certified Information Security Management System supporting its Operator Connect service. Its policies include Information Security, Incident Management, Acceptable Use, Access Control, Data Protection, Confidential Data Handling, Backup, and Business Continuity. Gamma maintains board‑level security oversight, applies recognised personnel screening standards, and is supported by Cyber Essentials and Cyber Essentials Plus certifications.

Together, Opus and Gamma provide a secure, standards‑aligned environment with strong governance, risk management, and compliance processes.
Software Security Code of Practice
No

Operational security

Configuration and change management standard
Supplier-defined controls
Configuration and change management approach
Opus maintains a structured configuration and change management framework to ensure all service components are tracked and securely assessed before modification. Baseline configurations for all systems are documented, updated, and monitored throughout their lifecycle, with reviews to ensure alignment with security requirements. A central configuration database records customer environments for accurate tracking. Changes follow an ITIL‑aligned process, with every request logged and documented. Each change undergoes risk and security‑impact assessment, covering affected assets and control implications, and requires approval from authorised roles before implementation. Version control, audit trails, and updated documentation ensure secure, controlled, and traceable system evolution.
Vulnerability management type
Supplier-defined controls
Vulnerability management approach
Opus operates an ISO 27001‑aligned vulnerability management process combining automated scanning, penetration testing, and annual information‑security risk assessments. Automated tools identify system weaknesses, with scheduled scans prioritising high‑risk issues for rapid remediation. Penetration testing simulates cyberattacks to uncover exploitable gaps, while Microsoft 365 security audits strengthen cloud configurations. Threat intelligence comes from scanning tools, pen‑test findings, configuration reviews, Cyber Essentials/Plus requirements, and ISO 27001 monitoring activities. Although specific patch timelines are not documented, Opus follows risk‑based prioritisation to deploy updates promptly, ensuring vulnerabilities are addressed quickly and controls remain effective.
Protective monitoring type
Supplier-defined controls
Protective monitoring approach
Opus uses multiple protective monitoring measures to detect and respond to potential compromises. Automated vulnerability scans, Microsoft 365 security audits, and penetration testing identify weaknesses or abnormal activity across systems. Opus’ ISO 27001‑aligned ISMS provides continuous risk and incident monitoring, feeding findings back into security controls. When a potential compromise is detected, incidents are logged, assessed, and escalated through Opus’ formal incident‑management process, ensuring rapid investigation and remediation. Response times align with Cyber Essentials Plus and ISO 27001 expectations for timely action on high‑risk issues.
Incident management type
Supplier-defined controls
Incident management approach
Opus operates a predefined incident process with automatic logging, severity assignment, and SLA‑driven response thresholds. Common events are handled through standardised workflows in the Incident Management System (IMS). Users report incidents via email (auto‑converted to P4), by phone—bypassing auto‑attendants for rapid logging—or through the Opus Customer Portal, which also provides real‑time status visibility. Incidents are monitored on wallboards, with Level 1–2 cases triggering immediate alerts and escalation to senior managers. Incident reports and acknowledgements are automatically issued by email, with full tracking available through the portal.
Post-quantum cryptography secure
No

Secure development

Approach to secure software development best practice
Independent review of processes (for example CESG CPA Build Standard, ISO/IEC 27034, ISO/IEC 27001 or CSA CCM v4.0)

Public sector networks

Connection to public sector networks
Yes
Connected networks
  • Joint Academic Network (JANET)
  • Health and Social Care Network (HSCN)

Pricing

Discount for educational organisations
No
Free trial available
No

Discount percentage by annual call-off contract value (excluding VAT)

Less than £250,000
0%
Between £250,000 and £500,000
0%
Between £500,001 and £1,000,000
0%
Between £1,000,001 and £2,500,000
0%
Between £2,500,001 and £5,000,000
0%
Over £5,000,001
0%

Non-mandatory Standards and certifications

ISO/IEC 27001 certification
Yes
Who accredited the ISO/IEC 27001
Approachable Certification
ISO/IEC 27001 accreditation date
Tuesday 27 July 2027
What the ISO/IEC 27001 doesn’t cover
Everything is covered
ISO 28000:2022 certification
No
ISO 9001 certification
Yes
Who accredited the ISO 9001 certification
Approachable Certification
ISO 9001 accreditation date
Friday 1 December 2023
What the ISO 9001 doesn’t cover
Everything is covered
Quality management systems (QMS)
Yes
CSA STAR certification
No
PCI certification
No
Cyber essentials
No
Cyber Essentials Alternative
None of the criteria
Cyber essentials plus
Yes
Please provide your Cyber Essentials Plus Certificate Number
De7de48a-322f-4b14-b4ee-6069f39992ee
Other security certifications
No

Social value

Section B - Commitment for Future: Delivery
  • Mission: Kick start economic growth. To secure the highest sustained growth in the G7 - with good jobs and productivity growth in every part of the country making everyone, not just a few, better off.

    Policy Outcome 1: Fair work: That offers fair wages and good working conditions. Help people get a job, stay in work, and progress in their careers, with good employment opportunities across the country. Notes: Where there is a large proportion of labour costs in the contract, commercial teams should consider MAC in Outcome 1 as a priority

    • Activities that support an environment where staff are educated about and feel empowered to report and address bullying and harassment
    • Payment of more than the National Minimum Wage or National Living Wage (as appropriate) to the contract workforce
    • Volunteering opportunities for staff
    • Understanding of the modern slavery risks and issues affecting the market, industry, sector or country (of origin or of source) relevant to the contract, and the workforce in the supplier’s own organisation and those of its key subcontractors
  • Mission: Kick start economic growth. To secure the highest sustained growth in the G7 - with good jobs and productivity growth in every part of the country making everyone, not just a few, better off.

    Policy Outcome 3: Resilient, innovative and flexible supply chains: Support economic growth through enabling resilient businesses, opportunities for small businesses and voluntary, community and social enterprises

    • Plans for positive actions with community groups.
  • Mission: Build an NHS fit for the future: That is there when people need it; with fewer lives lost to the biggest killers; in a fairer Britain, where everyone lives well for longer.

    Policy Outcome 8: Increasing productivity through physical and mental wellbeing: In the supply chain and communities in the relevant area.

    • Understanding of issues relating to health and wellbeing, including physical and mental health, in the contract workforce

Service documents

Request an accessible format
If you use assistive technology (such as a screen reader) and need versions of these documents in a more accessible format, email the supplier at bid@opustech.co.uk. Tell them what format you need. It will help if you say what assistive technology you use.