Webex Calling locations and number management
Verified 2026-09-04 · 10 claims · sources tier 2
Locations serve as structural containers that bind essential telephony settings, routing parameters, and emergency configurations to an organization's deployment. Proper management of these locations and their assigned telephone numbers ensures compliant dialing behavior and adherence to system capacity boundaries.
Location Bindings and Elements
Every location binds together a single PSTN option, an emergency address designated for 911 service, a main number that acts as the external caller identity, a time zone, and a routing prefix 3. Assigning a main number to a location is strictly mandatory if that location contains any trunks or extension-only entities 4. Location routing prefixes can be configured from one to seven digits, while internal extension lengths range from two to ten digits, defaulting to four digits 10.
Scaling and Number Management
Locations utilizing a Local Gateway operate under a default scale limit of 250 concurrent calls, which directly dictates how locations must be sized and split, whereas locations using Cloud Connected PSTN do not face this specific limit 2. When managing phone numbers, all numbers must adhere to the E.164 format globally, with the exception of the United States, which also accepts the national format 7. Administrators can add up to 1000 phone numbers simultaneously in a single bulk add operation within Control Hub 6.
When moving numbers between locations, the target location must share the same country and the same PSTN provider or local gateway provisioning, and the number must be unassigned prior to the move 8. Additionally, a location's designated main number cannot be moved to another location 8.
Applicability
The claims in this article apply to multi-tenant and premises-based PSTN deployments under commercial editions, current as of 2026-09-04 23410768.
What remains uncertain
Readers should verify whether upcoming platform updates alter the 250 concurrent call scale limit for Local Gateways, modify bulk add maximum thresholds, or introduce exceptions to the cross-location number movement constraints.
See also
Binds
- Webex Calling enhanced emergency calling — The emergency address is a location-level binding
Referenced by
- Webex Calling architecture and deployment modelsstub — A location is the primary unit of Webex Calling configuration
- CUCM to Webex Calling migration — Locations and numbers are created as part of the migration
Claims
| # | Claim | Status | Confidence | Verified |
|---|---|---|---|---|
| 1 | A PSTN connection and a main number on the Webex Calling multi-tenant side are required for the interoperation SIP trunk between multi-tenant and Dedicated Instance to route calls successfully. Dedicated Instance for Webex Calling — base configuration · Cisco configured components, Location row | fact | 0.90 | 2026-09-04 |
| 2 | A location using a Local Gateway is subject to a default scale limit of 250 concurrent calls, which affects how locations should be sized and split; locations using Cloud Connected PSTN are not subject to that limit. Cisco Preferred Architecture for Webex Calling — Design Overview · Location Definitions, Deployment Aspects, pages 60-61 | fact | 0.90 | 2026-09-04 |
| 3 | A location binds 1 PSTN option, an emergency address used for 911 service, a main number that also serves as external caller identity, a time zone, and a routing prefix. Configure Webex Calling for your organization · Elements bound to a location | fact | 0.90 | 2026-09-04 |
| 4 | Assigning a main number to a location is mandatory if the location has any trunks or any extension-only entities. Configure Webex Calling for your organization · Elements bound to a location | fact | 0.90 | 2026-09-04 |
| 5 | Number assignment behaviour during migration depends on the location's PSTN model: Local Gateway locations offer Add numbers to location, cloud PSTN locations offer Auto assign numbers, and mixed deployments require manual configuration with both options unavailable. Migrate Unified CM data to Webex Calling · Location and number management | fact | 0.60 | 2026-09-04 |
| 6 | Up to 1000 phone numbers may be added in a single bulk add operation in Control Hub. Manage phone numbers in Control Hub · Number addition | fact | 0.90 | 2026-09-04 |
| 7 | Phone numbers must follow E.164 format for all countries except the United States, where national format is also accepted. Manage phone numbers in Control Hub · Number formatting | fact | 0.90 | 2026-09-04 |
| 8 | Moving a number between locations requires the same country and the same PSTN provider or local gateway provisioning, and the number must not currently be assigned; a location's main number cannot be moved to another location. Manage phone numbers in Control Hub · Moving numbers between locations | fact | 0.60 | 2026-09-04 |
| 9 | Exactly 1 PSTN choice can be configured for each Webex Calling location. Cisco Preferred Architecture for Webex Calling — Design Overview · Combining On-Premises Trunk and Cloud PSTN for PSTN Access, page 32 | fact | 0.90 | 2026-09-04 |
| 10 | A location routing prefix may be 1 to 7 digits, and internal extension length is configurable from 2 to 10 digits with a default of 4. Configure Webex Calling for your organization · Dial plan configuration, internal dialing settings | fact | 0.60 | 2026-09-04 |
Sources
Cisco Preferred Architecture for Webex Calling — Design Overview
Configure Webex Calling for your organization
Dedicated Instance for Webex Calling — base configuration
Manage phone numbers in Control Hub
Migrate Unified CM data to Webex Calling
Cite this page
APA
WarmTransfer. (2026, September 4). Webex Calling locations and number management. WarmTransfer. https://warmtransfer.net/knowledge/webex-calling-locations-numbers
BibTeX
@misc{warmtransfer-webex-calling-locations-numbers,
title = {Webex Calling locations and number management},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/webex-calling-locations-numbers},
note = {Verified 2026-09-04}
}