Senior Microsoft Teams Phone & Telephony Migration Engineer

We are seeking a Senior Microsoft Teams Phone & Telephony Migration Engineer to lead enterprise telephony migrations to Microsoft Teams Phone. The successful candidate will have extensive hands-on experience migrating legacy PBX and VoIP systems to Microsoft Teams Phone, configuring voice connectivity, and ensuring seamless business communication throughout the transition. This full-time role requires working hours aligned with Singapore Standard Time (SGT, UTC +8) and collaboration with regional stakeholders during Singapore business hours.

Key Responsibilities

- Plan and execute migrations from legacy PBX, on-premises telephony, or existing VoIP platforms to Microsoft Teams Phone.
- Assess existing telephony infrastructure, including phone numbers, extensions, call flows, SIP trunks, gateways, and voice routing.
- Configure Microsoft Teams Phone components such as Direct Routing, Operator Connect, and Calling Plans according to the migration architecture.
- Set up and troubleshoot Session Border Controllers (SBCs), SIP trunks, voice gateways, and call-routing policies.
- Manage number porting, user assignments, dial plans, emergency calling, auto attendants, and call queues.
- Develop comprehensive migration plans, including test cases, rollback procedures, and cutover strategies to minimize downtime.
- Troubleshoot complex voice issues such as call failures, one-way audio, latency, packet loss, and SIP signaling errors.
- Coordinate with network teams, telecom providers, vendors, and business stakeholders throughout the migration lifecycle.
- Validate call quality, functionality, security, and service availability post-migration.
- Maintain detailed technical documentation, migration reports, and post-migration support procedures.

Required Qualifications

- 5 to 8 years of experience in enterprise telephony, unified communications, or voice infrastructure.
- Proven hands-on experience migrating enterprise telephony systems to Microsoft Teams Phone.
- Practical knowledge of Microsoft Teams Admin Center, Teams PowerShell, SIP, VoIP, SBCs, and Direct Routing.
- Experience managing number porting, dial plans, voice routing, auto attendants, and call queues.
- Solid understanding of networking fundamentals, including TCP/IP, DNS, firewalls, VLANs, and Quality of Service (QoS).
- Demonstrated ability to plan migration cutovers, troubleshoot production issues, and execute rollback procedures effectively.
- Strong communication, documentation, and stakeholder management skills.

Preferred Qualifications

- Experience working with AudioCodes, Ribbon, Cisco, Oracle, or other enterprise telephony platforms.
- Relevant Microsoft Teams Phone or Microsoft 365 certifications.
- Experience managing large-scale enterprise voice migrations and hybrid telephony environments.

Candidates should be prepared to highlight specific Microsoft Teams Phone migration projects in their applications, detailing the source telephony platform, migration scope, technical responsibilities, and outcomes achieved. This role offers the opportunity to work on complex, high-impact telephony migration projects within a dynamic enterprise environment.