Job Title

Senior Unified Communications Consultant Microsoft Teams Voice & Avaya MigrationLocation: Remote (UK-based preferred) with occasional customer site visitsRole Overview:We are seeking a highly experienced Senior Unified Communications Consultant to lead and deliver a full discovery and transformation report for the migration of an enterprise Avaya on-premise telephony environment to Microsoft Teams Voice. The successful candidate will produce a high-fidelity consulting report akin in structure and depth to a network SASE transformation plan, detailing current-state architecture, Teams deployment flavours, migration stages, risk and commercial considerations, and post-migration support strategy.Key Responsibilities:Lead discovery workshops with client stakeholders across IT, Network, Telephony, and Security domains.Conduct comprehensive assessment of the existing Avaya on-premise telephony architecture, including PBXs, call routing, SBCs, integrations (e.g. call recording, CRM, contact centres), and trunking (SIP/ISDN).Map the current-state to the target Microsoft Teams architecture using Direct Routing, Operator Connect, and Microsoft Calling Plans.Document and evaluate the pros, cons, and use cases for each Teams Voice deployment option relevant to the customer.Identify dependencies, gaps, risks, and organisational readiness for cloud telephony adoption.Develop a detailed, staged migration strategy including timelines, cost models, and technical migration steps.Build a report document that includes: - Executive summary and transformation benefits - Key recommendations - Migration stages with associated risks, commercial impact, and architecture evolution - Integration with call recording, compliance tools, and legacy services - Commercial model with ROI forecast - Appendices with diagrams, BOM, capacity planning, vendor comparisons, and relevant Visio/Excel artifactsEssential Experience:Proven track record of delivering transformation/migration strategies from legacy PBX to Microsoft Teams Voice at enterprise scale.Deep knowledge of Avaya systems (Aura, IP Office, CM, etc.) and telephony infrastructure (SBCs, SIP trunks, gateways).Expertise across Microsoft Teams Voice ecosystem: Operator Connect, Direct Routing, Microsoft Calling Plans, Teams Phone System.Familiarity with regulatory requirements and integrations (e.g., PCI-DSS, MiFID II, call recording, CRM, etc.)Experience in producing customer-facing consulting artefacts with a high standard of technical depth and executive relevance.Excellent stakeholder engagement and communication skills.Microsoft 365 Certified: Teams Voice Engineer Expert (MS-720 or equivalent)Avaya certifications (ACSS, ACIS) or similar vendor credentialsExperience with compliance voice recording platforms (e.g., NICE, Verint, ASC, RedBox)Familiarity with managed service transitions or service design frameworks (e.g., ITIL, TOGAF)Deliverables:A comprehensive, reference-quality migration and transformation report (PDF + associated artefacts)Visio diagrams of current and target architecturesCommercial and ROI analysis (Excel-based)Risk matrix and mitigation plansExecutive PowerPoint summary (optional but preferred)