Telephony Engineer - eDV Cleared

Join a Major Secure Communications Transformation ProgrammeA 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 RoleAs 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.