Education Industry- Large-Scale Webex Calling Migration Across 75 Distributed Sites case study

 

About the company

The Unified School District involved the successful migration of 75 geographically distributed school sites from a legacy on-premises telephony platform to Cisco Webex Calling (Cloud-based UCaaS). This engagement involved the modernization of a highly distributed educational voice environment, transitioning critical telephony services to a cloud-native architecture. The project required careful coordination, standardized deployment methodologies, and rigorous validation to ensure service continuity. The migration is on track for completion by December, with each site executed through controlled and repeatable cutover processes, resulting in minimal operational disruption.

CHALLENGES

The project presented several challenges due to the highly distributed nature of the educational environment and the critical reliance on uninterrupted voice services. Migrating legacy telephony systems to a cloud-native architecture required precise coordination across multiple sites, consistent deployment standards, and carefully managed cutover processes. Ensuring service continuity during each transition, while validating functionality and minimizing operational disruption, added complexity to the execution timeline and demanded rigorous planning and oversight.

Assessment and solution

Our Professional Services Engineering team provided comprehensive, end-to-end delivery across all phases of the migration lifecycle:

  • Pre-Migration Readiness & Validation

  1. Network readiness assessments, including WAN/LAN capacity, QoS validation, and firewall rule verification

  2. Session Border Controller (SBC) configuration review and interop validation

  3. PSTN number porting readiness, dial-plan alignment, and user mapping

  4. Pre-provisioning of Webex Calling users, devices, and locations

  • Migration & Cutover Execution

  1. Structured cutover planning with defined maintenance windows per site

  2. Real-time remote engineering support during migrations

  3. Controlled transition of users, devices, and DID ranges to Webex Calling

  • Feature & Service Validation

  1. End-to-end call flow testing (internal, PSTN inbound/outbound)

  2. Voicemail, auto-attendant, hunt group, and call routing verification

  3. Directory synchronization and user experience validation

  4. Performance monitoring to confirm call quality and latency thresholds

  • Issue Management & Remediation

  1. Centralized tracking of issues and site-specific exceptions

  2. Rapid root-cause analysis and remediation to maintain deployment consistency

  3. Continuous feedback loop to refine subsequent site migrations

  • Post-Cutover Stabilization

  1. Final service validation and health checks

  2. Troubleshooting and escalation support as required

  3. Confirmation of operational readiness before site sign-off

    Solution:

Through a disciplined, repeatable, and technically robust migration framework, the project delivered:

  • High service availability with no unplanned outages

  • Improved call reliability and cloud-based scalability

  • Standardized voice services across all 75 locations

  • A modernized UC platform aligned with future growth and collaboration needs

advantages

Through a disciplined, repeatable, and technically robust migration framework, PM2NET successfully delivered a resilient and future-ready voice environment. The project achieved high service availability with no unplanned outages, ensuring uninterrupted communication throughout the transition. Call reliability was significantly improved, supported by the scalability and flexibility of a cloud-based architecture. Additionally, standardized voice services were implemented across all 75 locations, providing operational consistency and simplified management. The result is a modernized unified communications platform designed to support future growth, collaboration, and evolving educational needs.