Plan DID ranges, extension numbering, and reserved blocks for auto-attendants, hunt groups, and voicemail pilots. Emits a carrier-ready port request and Control Hub assignment list.
Every Webex Calling deployment needs a clean number plan: DIDs for users who need external reach, extensions for internal-only, plus reserved blocks for AAs, hunt groups, paging, and voicemail pilots. This tool takes your user count + DID block size and produces the full allocation — plus a carrier LOA / port request template if you're migrating numbers.
Enter counts, click Generate Number Plan.
One per user with external calling.
Internal-only. Same plan for DID users too.
Reserved ext block for call routing objects.
10-20% growth headroom.
Best-practice numbering: extension = last 4 of DID. If user DID is +1 214 555 1042, their extension is 1042. This makes internal reach-me predictable and works with mobile soft clients that show extension vs external number. The downside: DID block must be contiguous. If your carrier can only give you fragmented blocks, fall back to a separate extension plan (e.g. 2000-3999 for HQ, 4000-5999 for Branch).
Reserve extensions for routing objects. Don't assign AAs and hunt groups random numbers — designate a block like 8000-8099 for AAs, 8100-8199 for hunt groups, 8200-8299 for voicemail pilots. This makes audit and troubleshooting much easier two years later when you've forgotten which object answered what.
Port windows are 10-14 business days on average. Submit your port request with the full LOA (Letter of Authorization), CSR (Customer Service Record), and authorized signature 3 weeks before cutover. Webex Calling coordinates the port date with you; numbers swing at a pre-announced minute.
Yes, but Control Hub assigns numbers to locations, not ranges. Easier if contiguous.
Webex Calling sells in blocks of 10, 100, or 1000 depending on provider.
10-14 business days for the LOA submission + carrier coordination.
Yes — toll-free ports work the same way. Submit separate LOA to the TF carrier.
Clean block from single area code.
Warehouse has shared phones, office has DIDs.
Leaving legacy PBX.
Our UC Modernization Sprint coordinates carrier, validates records, and manages the port window — no lost calls.