UC Transformation Consultant

JR United Kingdom; Newport; Remote; GBP 70,000 - 100,000; Full time

Job summary

A leading consulting firm seeks a Senior Unified Communications Consultant to manage the migration from Avaya telephony systems to Microsoft Teams Voice. The role requires leading discovery sessions, creating detailed migration strategies, and engaging with stakeholders across various domains. Ideal candidates will have in-depth knowledge of both Avaya and Teams ecosystems, alongside proven consultancy experience at the enterprise level.

Qualifications

• Proven track record of large enterprise transformation from PBX to Teams Voice.
• Deep knowledge of Avaya infrastructure and Microsoft Teams ecosystem.
• Experience creating high-quality consulting deliverables.

Responsibilities

• Lead discovery workshops with clients on telephony migration.
• Assess existing Avaya systems and map to Teams architecture.
• Develop migration strategies with timelines and cost models.

Skills

Stakeholder engagement

Communication skills

Cloud telephony adoption

Risk analysis

Education

Microsoft 365 Certified: Teams Voice Engineer Expert (MS-720)

Avaya certifications (ACSS, ACIS)

Tools

Microsoft Teams Voice

Avaya systems (Aura, IP Office, CM)

PCI-DSS

ITIL

TOGAF

Job description

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Senior Unified Communications Consultant – Microsoft Teams Voice & Avaya Migration

Location: Remote (UK-based preferred) with occasional customer site visits

Role 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 artifacts
• 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 credentials
• Experience with compliance voice recording platforms (e.g., NICE, Verint, ASC, RedBox)
• Familiarity with managed service transitions or service design frameworks (e.g., ITIL, TOGAF)
• A comprehensive, reference-quality migration and transformation report (PDF + associated artefacts)
• Visio diagrams of current and target architectures
• Commercial and ROI analysis (Excel-based)
• Risk matrix and mitigation plans
• Executive PowerPoint summary (optional but preferred)