Job Summary

Role Category

Technical Lead for enterprise telephony solutions, including TOIP, Teams Phone, Direct Routing, SBC, SIP trunks and associated services integrated with Microsoft 365.

Activities Performed

• Design the technical architecture for Teams and TOIP telephony solutions.

• Build, maintain and evolve the product technical roadmap.

• Ensure performance, quality, resilience and service availability.

• Drive monitoring, automation and industrialization for telephony services.

• Supervise SBCs, SIP trunks, numbering plans and Direct Routing.

• Handle integration, deployment, operations and level 3 support.

• Ensure QoS, media quality, reporting, security and compliance across the voice landscape.

• Work with Product Owner, network, Teams, Exchange, cybersecurity and architecture teams.

• Mentor engineers and contribute to complex incident resolution and post-incident reviews.

Deliverables

• Telephony technical roadmap.

• Detailed architecture and technical documentation.

• Test and technical validation plans.

• Automation and industrialization scripts.

• Telephony KPIs covering QoS, media quality and availability.

• Post-incident reports and improvement plans.

Requirements

Mandatory Skills / Required Competencies

• Advanced TOIP, SIP, RTP and QoS knowledge

• Microsoft Teams Phone expertise

• Direct Routing, SBC and SIP trunk administration

• Call plans and numbering policies

• Teams / SBC / operator interoperability

• Network knowledge: VoIP, routing, NAT, firewall and traffic prioritization

• PowerShell, JSON and telephony automation scripting

• Monitoring of SBC, Teams QoS and SIP services

• Complex voice incident troubleshooting using SBC logs, SIP traces and Teams diagnostics

• Telephony security: encryption, certificates, SBC hardening and anti-fraud controls

Preferred Skills / Exposure

• Advanced SBC manufacturer knowledge: Audiocodes, Oracle, Ribbon or equivalent

• On-premise or hybrid VOIP exposure: Cisco CUCM, Avaya, Alcatel-Lucent, Mitel or equivalent

• Python, Teams Calling APIs and advanced automation tooling

• Data and observability: Power BI, KQL, custom QoS dashboards

• Advanced VoIP protocols: SRTP, ICE, STUN/TURN, DSCP

• Technical project coordination in multi-squad or multi-provider environments

• Agile product contribution and ITIL process knowledge

• FinOps or cost optimization awareness for Teams Phone, SBC and SIP operators

Application Landscape / Environment

• Enterprise telephony and unified communications

• Microsoft 365 ecosystem with Teams Phone

• TOIP, Direct Routing, SBC, SIP trunks, numbering plans and operators

• Network, Exchange, cybersecurity and architecture interfaces

Mode of Intervention / Experience

• Senior technical lead profile for global enterprise telephony services, with strong architecture, operations and incident-management expertise.

Key Responsibilities

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Skill Requirements

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Other Requirements

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