UCM to Webex Calling Migration for Entire State Government, including all Agencies

01

Challenge

We stepped into a stalled state-government migration involving approximately 26,000 users across all state agencies. Native Webex migration tooling could not meet the environment’s scale or data complexity, and internal staffing was constrained. The environment also carried a large analog estate — hundreds of analog telephone adapters and dozens of voice gateways — that had to move alongside users, devices, and workspaces.

02

Approach

We rebuilt the delivery model around a repeatable, semi-automated process combining native Webex tooling with custom Python and Webex Calling REST API workflows. We reconciled telephone-number inventories across CUCM, Webex, and carrier records to support both provisioning and porting. Each cutover followed a defined method of procedure with acceptance testing, E911 location mapping, and day-one support, and we coordinated provisioning changes with the state’s own teams after every migration wave. Our scope also included hunt groups, auto attendants, pickup groups, speed dials, voicemail, and call-routing features.

1. 01

   Inventory reconciliation

2. 02

   API provisioning

3. 03

   Migration & porting

03

Outcome

We migrated approximately 26,000 end users, associated devices, and workspaces in roughly four months of active cutovers, executed as 14 coordinated after-hours waves. We configured the analog estate — up to 324 analog telephone adapters and 49 voice gateways — migrated calling features, and coordinated the porting or movement of 30,000+ DIDs across multiple carriers. Each wave closed with acceptance testing, as-built documentation, and knowledge transfer to the state’s operations teams.