Mohammed Mairghani

Results-driven L3 Voice & Collaboration Engineer with 7+ years of experience managing mission-critical enterprise environments. Expert in SIP technologies and multi-vendor collaboration platforms including Cisco, Microsoft Teams, Avaya, Genesys, Ribbon SBC, Verba, Polycom, Q-SYS, VMware ESXi, Grandstream, Yeastar,ARTECH, and Ameyo. Skilled in cloud technologies (Microsoft Azure, Amazon Web Services), network infrastructure (Cisco, Huawei, Aruba, Wireless LAN Controllers), recording systems, and low current systems including CCTV, access control, and gate barrier solutions.

Experienced in network and voice solution design, including HLD, LLD, Rack Elevation, MOS, AutoCAD, Telephony Layouts, and Call Flow design. Proven expertise in troubleshooting complex voice and collaboration issues, optimizing service performance, and ensuring high availability and operational continuity across enterprise environments.

• Provide expert‑level L3 ownership and full operational leadership of enterprise Voice & Collaboration platforms across multi‑vendor environments including Cisco CUCM/CUC, Voice Gateways, Ribbon SBC, Genesys Contact Center, Microsoft Teams, Polycom, Q‑SYS AV, SpeechLog/Verba recording, and SIP infrastructure.
• Architect, manage, and continuously optimize hybrid voice ecosystems integrating on‑prem platforms (CUCM, Voice Gateways, SBC, Genesys Contact Center) with cloud services such as Microsoft Teams, ensuring seamless interoperability, unified dial plans, and resilient PSTN connectivity.
• Design, administer, and troubleshoot Cisco CUCM clusters and enterprise voice gateway infrastructure, ensuring high availability, resilient call processing, and stable SIP trunk connectivity.
• Lead end‑to‑end SIP architecture and enterprise call routing strategy including SIP trunks, Teams Direct Routing, SBC integrations, dial plan normalization, and hybrid voice deployments.
• Administer Microsoft Teams Voice services including Direct Routing, voice routing policies, dial plans, SBC integration, and Microsoft Teams Rooms (MTR) solutions to deliver optimized enterprise meeting and collaboration experiences.
• Design and optimize Genesys Contact Center and IVR solutions, including advanced call flows, routing strategies, workforce management integration, and seamless interoperability with enterprise voice platforms.
• Perform advanced troubleshooting across SIP, SDP, RTP, codec negotiation, QoS, and complex call routing scenarios to resolve critical voice and video incidents.
• Diagnose and remediate network‑related voice quality issues such as latency, jitter, packet loss, bandwidth congestion, and firewall/NAT traversal across LAN and WAN environments.
• Architect and maintain High Availability, Disaster Recovery, geographic redundancy, and failover mechanisms to ensure business continuity and service resilience.
• Manage enterprise AV and conferencing environments (Polycom, Q‑SYS, Microsoft Teams Rooms), including acoustic tuning, camera tracking, microphone optimization, and audio/video performance enhancement.
• Administer call recording and compliance platforms (SpeechLog & Verba), ensuring secure storage, retention policies, encryption, and regulatory compliance.
• Manage SSL certificate lifecycle across CUCM, SBCs, Genesys, and cloud integrations to ensure secure communications and trusted service connectivity.
• Lead major upgrades, migrations, patching, and lifecycle management activities aligned with enterprise change management while minimizing service disruption.
• Design and implement QoS strategies, traffic prioritization, and proactive monitoring frameworks to maintain high service performance and reliability.
• Develop and maintain enterprise technical documentation including HLDs, LLDs, IP schemas, and call flow diagrams.
• Collaborate with vendors, system integrators, and cross‑functional teams (network, security, infrastructure, and applications) to deliver fully integrated end‑to‑end voice solutions.
• Act as the primary L3 escalation point, leading incident management, Root Cause Analysis (RCA), and implementation of permanent corrective actions.
• Leverage strong expertise in Microsoft 365 and Azure, supporting Teams administration, hybrid voice architectures, and Azure‑hosted voice workloads.
• Ensure Microsoft 365 services (Exchange Online and SharePoint Online) are optimally routed with correctly positioned DNS resolvers, firewall rules, and traffic flows to guarantee secure and high‑performance hybrid connectivity.
• Proactively identify operational risks, drive preventive improvements, and continuously enhance platform stability, scalability, and user experience.
• Lead major outage recovery and service restoration activities, ensuring rapid recovery and minimal business impact.

Bachelor Degree of telecommuncation Engineer, CCNA, CCNP ENCORE, CCNP SD-WAN, CCNP ENTERPRISE, CLF-C02