An organisation with 75 users had an ageing office PBX, inconsistent call routing and limited support for hybrid working. Number records had grown over many years and nobody had a complete map of DDIs, hunt groups and out-of-hours rules.
The requirement
The greatest risk was not installing the new platform. It was moving the public telephone numbers without losing important routing, emergency information or departmental call behaviour.
The proposed telecoms design
The design used a managed 3CX platform with selected Yealink desk and DECT devices, desktop and mobile clients, SIP trunks and documented call flows. Departments received queues, ring groups and business-hours rules based on actual working practices.
Delivery approach
- Audit users, numbers, handsets, analogue devices and call recording needs.
- Obtain current-provider records and validate porting information.
- Build the platform and call flows in advance.
- Stage and label devices, then train key users.
- Complete test calls and a controlled number-porting window.
Commercial and operational outcome
The organisation gained consistent call handling across office and remote users. Administration became easier, and the support team had a documented inventory of numbers, users, devices and routing. Resilience options could also be planned around apps, diversions and secondary connectivity.
What this scenario demonstrates
A successful phone migration begins with discovery and number control. Handsets and licences are only part of the project. Connectivity, local network quality, security, porting and user adoption matter just as much.
Next step
39T can review an existing phone system and plan a managed migration to 3CX, Yealink devices and suitable SIP or VoIP trunks.