// COLLABORATION / UNIFIED COMMS
Your clients have to leave CUCM. We move them cleanly.
CUCM 12.5 is out of support and 14 perpetual licensing is end-of-sale. Every enterprise client knows they need Webex Calling, and every scoping call surfaces the same blockers: voicemail with no migration path, recording that will not port, a dial plan too complex to redesign live. We do the migration, under your brand.
Plan a UC migrationThe migration is overdue. The question is who delivers it.
CUCM 12.5 hit end-of-support on 31 August 2025, and CUCM 14 perpetual licensing went end-of-sale on 7 April 2025. Enterprise clients want to move to Webex Calling, but every scoping pass turns up voicemail integrations that cannot be replicated, call recording that will not port, and a dial plan too tangled to redesign while the phones stay live. A partner who cannot deliver that migration competently does not just lose the project; they lose the client's confidence in every UC engagement after it. We are the delivery team standing behind your name.
What we deliver.
CUCM-to-Webex Calling Migration
The full lifecycle: environment audit, device inventory, Webex Calling tenant provisioning, site-by-site phased migration and an off-hours cutover with a documented rollback. Cisco ran this at 84,000 users across 300+ locations; we bring the same method to your client estate.
Dial Plan Redesign
Webex Calling enforces fixed extension lengths, so enterprise seven-digit numbering breaks without a rebuild. We audit the existing plan, map every feature to its Webex equivalent, and re-engineer the numbering before a single phone moves.
Webex Hybrid Calling
Cisco's industry-first hybrid architecture connects existing CUCM to cloud AI features (AI Receptionist, AI Assistant, Translator Agent) without decommissioning the on-prem PBX. It buys a two to three year migration runway for clients not ready to rip and replace.
Voicemail & Call Recording
Cisco Unity Connection voicemail has no native migration path and on-prem recorders go incompatible. We provision new Webex voicemail for every user, archive history where it is required, and move recording to cloud capture via Dubber.
Edge & Trunking
Expressway and CUBE for Mobile Remote Access, B2B federation and SIP trunking. The edge infrastructure that keeps remote workers and carrier connectivity live through the transition, not just the calling platform itself.
Teams Phone, When That Fits
Some clients live in Microsoft 365 and want Teams Phone instead. We deliver both paths and help you present a credible comparison, then execute whichever the client picks rather than selling them the platform we happen to prefer.
The numbers behind the move.
How the options compare.
What your client gets from an internal team, a major integrator, or our team under your brand.
UC migration, answered straight.
01 What happens to voicemail when migrating from CUCM to Webex Calling?
Cisco Unity Connection voicemail messages cannot be moved directly into Webex Calling; there is no native migration path. Our method provisions fresh Webex Calling voicemail for every user and, where the client needs it, archives historical messages locally. We put that limitation in the statement of work on day one, so it is a planned step, not a mid-migration surprise.
02 Can you migrate a complex dial plan with seven-digit extensions?
Yes, and dial plan complexity is the blocker we solve most often. Webex Calling enforces fixed extension lengths and does not support CAC or custom URI dialing. We audit the existing plan first, map each feature to its Webex equivalent or document what changes, and re-engineer the numbering before touching a phone. The redesign is scoped from the start.
03 How do you handle cutover risk? Can the phones go down?
We run a phased migration with parallel running, where CUCM and Webex Calling operate together during the cutover window. Cutovers happen off-hours against a pre-migration site checklist, and a documented rollback keeps CUCM available as fallback. Your team gets the full runbook at handover.
04 What about clients considering Microsoft Teams Phone instead?
We deliver both. Teams Phone has 26 million users and leads in Microsoft 365-heavy estates; Webex Calling has 18 million plus users and wins in voice-primary and regulated environments where first-party Cisco device integration and the 99.999% SLA carry weight. We help you present both options credibly and execute whichever path the client chooses.
05 What is Webex Hybrid Calling and when should we recommend it?
It is Cisco's industry-first hybrid architecture, announced at Cisco Live Amsterdam 2026. It links existing CUCM to Webex cloud capabilities (AI Receptionist, AI Assistant, Cloud PSTN) without an immediate CUCM decommission. Recommend it for clients who want cloud AI now but are not ready for a full rip-and-replace; it opens a two to three year migration runway.
06 Which Cisco phones are compatible with Webex Calling?
Only Cisco 7800 and 8800 series phones on firmware 14.1 or higher are supported. Unsupported devices have to be decommissioned. We run a device inventory and compatibility assessment early in the engagement, so the hardware story is clear long before cutover.
Tell us what your clients need.
A tri-cloud migration. A 200-site SD-WAN rollout. A security architecture before NIS2 hits. An AI system your client is asking about next quarter. We scope it, staff it, and deliver it under your brand. One conversation tells us if we are the right team.