List of Gamma SIP Trunking and Call Management Customers
Newbury, RG14 5BY,
United Kingdom
Since 2010, our global team of researchers has been studying Gamma SIP Trunking and Call Management customers around the world, aggregating massive amounts of data points that form the basis of our forecast assumptions and perhaps the rise and fall of certain vendors and their products on a quarterly basis.
Each quarter our research team identifies companies that have purchased Gamma SIP Trunking and Call Management for PBX, VoiP and Phone Systems from public (Press Releases, Customer References, Testimonials, Case Studies and Success Stories) and proprietary sources, including the customer size, industry, location, implementation status, partner involvement, LOB Key Stakeholders and related IT decision-makers contact details.
Companies using Gamma SIP Trunking and Call Management for PBX, VoiP and Phone Systems include: Kent County Council, a United Kingdom based Government organisation with 12000 employees and revenues of $2.30 billion, HGF Limited, a United Kingdom based Professional Services organisation with 315 employees and revenues of $81.0 million, Ubisoft Reflections, a United Kingdom based Professional Services organisation with 500 employees and revenues of $53.0 million, Ashford Borough Council, a United Kingdom based Government organisation with 415 employees and revenues of $52.0 million and many others.
Contact us if you need a completed and verified list of companies using Gamma SIP Trunking and Call Management, including the breakdown by industry (21 Verticals), Geography (Region, Country, State, City), Company Size (Revenue, Employees, Asset) and related IT Decision Makers, Key Stakeholders, business and technology executives responsible for the software purchases.
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| Logo | Customer | Industry | Empl. | Revenue | Country | Vendor | Application | Category | When | SI | Insight |
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Ashford Borough Council | Government | 415 | $52M | United Kingdom | Gamma Telecom | Gamma SIP Trunking and Call Management | PBX, VoiP and Phone Systems | 2025 | Trustmarque Solutions |
In 2025 Ashford Borough Council deployed Gamma SIP Trunking and Call Management as its primary PBX, VoiP and Phone Systems solution. The program migrated 550 users from Skype for Business and an on premise Mitel platform to Microsoft Teams Direct Routing paired with Gamma SIP trunking and Geomant call recording, with delivery and project ownership by Trustmarque Solutions.
The implementation configured Microsoft Teams Direct Routing for voice termination and inbound call handling, provisioned Gamma SIP trunks and public number ranges, and integrated Geomant for centralized call recording. Functional modules included SIP trunk provisioning, call routing and dial plan configuration, session signaling alignment with Teams voice workflows, and call recording ingestion and storage through Geomant.
Integrations spanned Microsoft Teams for end user telephony, Gamma Telecom SIP network for trunking and carrier services, and Geomant for third party call recording, forming an end to end back office telephony architecture. Operational coverage targeted council back office services and corporate communications across Ashford Borough Council, consolidating voice services for municipal departments onto a Teams centric voice stack.
Trustmarque Solutions executed a single weekend cutover to minimize operational impact, the rollout combined cutover orchestration, configuration migration and verification of call recording continuity. The case notes specify the implementation streamlined communications and achieved cost savings while maintaining minimal disruption during the transition.
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HGF Limited | Professional Services | 315 | $81M | United Kingdom | Gamma Telecom | Gamma SIP Trunking and Call Management | PBX, VoiP and Phone Systems | 2023 | Trustmarque Solutions |
In 2023, HGF Limited implemented Gamma SIP Trunking and Call Management as part of a PBX, VoiP and Phone Systems initiative for UK corporate telephony. Trustmarque Solutions delivered the project, migrating 400 users to Microsoft Teams Voice using Gamma Operator Connect and porting approximately 600 telephone numbers.
The Gamma SIP Trunking and Call Management deployment centralized SIP trunk provisioning and call routing and integrated with Microsoft Teams Voice via Gamma Operator Connect to provide Operator Connect based telephony services. Functional workstreams included operator connect provisioning, SIP trunk capacity configuration, call management and routing policy configuration, and number porting orchestration to align Microsoft Teams Voice with enterprise telephony functions.
Operational coverage focused on HGF Limited IT and service desk functions across the United Kingdom, consolidating telephony management under the Gamma platform to simplify billing and vendor support. Governance and rollout were executed by Trustmarque Solutions, which coordinated cutover sequencing and support handover, and the engagement delivered reduced helpdesk calls and simplified billing and support for IT.
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Kent County Council | Government | 12000 | $2.3B | United Kingdom | Gamma Telecom | Gamma SIP Trunking and Call Management | PBX, VoiP and Phone Systems | 2021 | Trustmarque Solutions |
In 2021, Kent County Council implemented Gamma SIP Trunking and Call Management, classified under PBX, VoiP and Phone Systems. The implementation routed approximately 20,000 telephone numbers and supported phased moves of roughly 5,000 users to Microsoft Teams Direct Routing across the council's communications estate.
The Gamma SIP Trunking and Call Management deployment combined SIP trunking termination with call management capabilities, explicitly delivering inbound call routing, enhanced inbound reporting and fraud protection. Configuration centered on Microsoft Teams Direct Routing to provide enterprise voice within Teams while retaining PSTN termination via Gamma SIP services.
The project was led by Trustmarque Solutions with participation from Cantium and Support to Win, reflecting a multi-vendor delivery and operational support model for a UK public sector telephony transformation. Integrations included Microsoft Teams Direct Routing and Gamma SIP services, and the implementation addressed council-wide telephony requirements across administrative sites and business functions responsible for communications and contact handling.
Rollout followed phased moves of user cohorts and number blocks to maintain business continuity during activation and cutover. Outcomes documented by the program included a simplified telephony estate, sustained business continuity through staged moves, and the addition of enhanced inbound reporting and fraud protection.
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Professional Services | 500 | $53M | United Kingdom | Gamma Telecom | Gamma SIP Trunking and Call Management | PBX, VoiP and Phone Systems | 2019 | n/a |
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