Telephony Engineer - eDV Cleared

Telephony Engineer - eDV Cleared

• Location: London, on-site
• Salary: Competitive + Benefits (Can consider contractors as well)
• Clearance: Active eDV Clearance Required
• To apply, email:

Join a Major Secure Communications Transformation Programme
A specialist technology delivery organisation is seeking an experienced Telephony Engineer to support a large-scale communications transformation programme within a secure environment.
This role will focus on the migration of legacy telephony platforms to modern unified communications solutions, supporting the design, configuration, deployment, testing, and optimisation of enterprise voice services.
You'll play a key role in ensuring continuity of service throughout complex migration activities, working closely with technical teams, suppliers, and operational stakeholders across multiple sites.

The Role
As a Telephony Engineer, you'll support the delivery of secure telephony and unified communications solutions across a complex enterprise environment.

Responsibilities include:
* Configuring, testing, and deploying telephony technologies including SIP, VoIP, SBCs, and cloud-based voice platforms
* Supporting migration activities such as number porting, handset deployments, endpoint onboarding, and legacy system decommissioning
* Troubleshooting telephony incidents, call routing issues, and integration problems
* Supporting the build and configuration of gateways, trunks, routing policies, and voice services
* Conducting site discovery activities, audits, and migration planning exercises
* Supporting cutover planning, pilot deployments, phased migrations, and transition activities
* Performing functional testing, failover testing, and user acceptance support
* Validating voicemail integrations, hunt groups, call flows, and contact centre functionality
* Producing technical documentation, configuration records, and implementation guides
* Working closely with suppliers, network teams, and managed service providers
* Communicating effectively with stakeholders and end users throughout deployment activities

Required Skills & Experience
* Proven experience working as a Telephony Engineer, Voice Engineer, or Unified Communications Engineer
* Strong hands-on experience with VoIP, SIP, SBCs, and enterprise call routing
* Experience with cloud telephony platforms such as Microsoft Teams Phone, Zoom Phone, Cisco, or Mitel
* Understanding of PSTN replacement approaches, number management, and porting processes
* Experience delivering telephony migrations or transformation programmes
* Strong troubleshooting skills across telephony, network, and endpoint technologies
* Ability to produce high-quality technical and operational documentation
* Experience working within secure or highly regulated environments
* Strong communication and stakeholder engagement skills

Desirable Experience
* Contact centre or IVR configuration experience
* Familiarity with legacy PBX platforms and migration strategies
* Experience within large-scale multi-supplier delivery environments
* Understanding of ITIL, change management, and service transition processes
* Exposure to secure communications or mission-critical telephony environments

What's On Offer
* Opportunity to work on a large-scale secure transformation programme
* High-impact technical delivery environment
* Collaborative and experienced engineering teams
* Long-term programme work with modern communications technologies
* Competitive salary and benefits package
If you hold active eDV Clearance and would like to learn more, please apply for immediate consideration.