Webex Calling locations and number management

See also

Sources

1. 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 · Checked 2026-09-04
2. 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 · Checked 2026-09-04
3. 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 · Checked 2026-09-04
4. 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 · Checked 2026-09-04
5. 5
   The migration flow offers 3 documented number-assignment scenarios by the PSTN model of the Webex locations involved: where all locations are local gateway, Add numbers to location is enabled and Auto assign numbers is greyed out; where all locations are Cloud Connected PSTN or Cisco PSTN, Auto assign numbers is enabled and Add numbers to location is greyed out; and where the locations are a mix of premises-based PSTN and Cloud Connected or Cisco PSTN, both options are greyed out.

   Migrate Unified CM data to Webex Calling · Scenarios for Auto Assign numbers and Add numbers to location, Scenario 1 to Scenario 3 · Checked 2026-09-16
6. 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 · Checked 2026-09-04
7. 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 · Checked 2026-09-04
8. 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 · Checked 2026-09-04
9. 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 · Checked 2026-09-04
10. 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 · Checked 2026-09-04
11. 11
    A phone number belonging to a block cannot be deleted in bulk unless every number in that block is unassigned, and a delete attempt on part of a range fails until the entire block is selected.

    Manage phone numbers in Control Hub · Delete phone numbers in bulk, Before you begin and step 6 · Checked 2026-09-15
12. 12
    Once a location has a PSTN connection and an emergency service address configured, its address fields cannot be edited from the location overview page; the emergency service address is updated instead and Control Hub then synchronises the overview page address from it.

    Configure Webex Calling for your organization · Add a location, closing note of step 5; repeated in Update an existing location step 7 · Checked 2026-09-15
13. 13
    Control Hub activates a maximum of 500 phone numbers at a time in its bulk activation flow, while a single add operation accepts up to 1000 numbers.

    Manage phone numbers in Control Hub · Activate numbers in bulk step 4, and Add phone numbers step 7 · Checked 2026-09-15
14. 14
    Deleting a Webex Calling location deletes all of its assigned services and numbers, and Cisco states that the numbers are released back to the PSTN provider and the organisation no longer owns them.

    Configure Webex Calling for your organization · Delete a location, Before you begin · Checked 2026-09-15
15. 15
    Cisco warns that where user extensions synchronised from Active Directory through Directory Connector already include the location routing prefix, Webex Calling adds the routing prefix again, producing duplicated prefixes.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 2, note under Location Routing Prefix Length · Checked 2026-09-15
16. 16
    Cisco states that the outbound dial digit prefix requirement is ignored for outbound calls placed in E.164 format, and that where a national number begins with the same digit as the outbound dial digit the system removes that initial digit, so the outbound dial digit must be added in front of the rest of the national number.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 4, note under External Dialing · Checked 2026-09-15
17. 17
    The optional Emergency Location Identifier on a Webex Calling location is sent to the emergency call provider inside the P-Access-Network-Info private SIP extension header, applies only in countries whose regulations require the identity of the cell to be established on an emergency call, and Cisco names France as such a country while stating that the United States and Canada determine location by other methods.

    Configure Webex Calling for your organization · Update an existing location, step 5, Emergency Calling · Checked 2026-09-15
18. 18
    Cisco states that once dialling the outbound dial digit is enforced for a location, any external destination number that does not include it, such as a call forwarding destination, no longer works, while emergency calls may be dialled with or without it.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 4, External Dialing · Checked 2026-09-15
19. 19
    Where an extension is the same as a national number, Cisco states that the extension takes precedence over the national number, and recommends enabling an outbound dial digit for that reason.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 4, note under External Dialing · Checked 2026-09-15
20. 20
    The Allow extension dialing between locations toggle is enabled by default and must be disabled where the same extension exists in more than 1 location; with it disabled, an extension dialled by a caller reaches the matching user in the caller's own location and other locations are reachable only by dialling the enterprise significant number.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 2, Allow extension dialing between locations · Checked 2026-09-15
21. 21
    Internal extension length is configurable from 2 to 10 digits with a default of 4, and Cisco states that after the extension length is increased, existing speed dials to internal extensions are not automatically updated.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 2, Internal Extension Length · Checked 2026-09-15
22. 22
    Where external number management is enabled for a number's carrier, Control Hub disables the Activate, Delete and Modify actions for that number.

    Manage phone numbers in Control Hub · Activate, modify, or remove phone numbers, notes on steps 3, 4 and 5 · Checked 2026-09-15
23. 23
    An organisation's last phone number cannot be removed, and Cisco's stated workaround is to add a new temporary number to the organisation first, then unassign and remove the number that was last.

    Manage phone numbers in Control Hub · Activate, modify, or remove phone numbers, step 4 · Checked 2026-09-15
24. 24
    A new Webex Calling location is hosted in the regional data centre corresponding to the country selected in the First Time Setup Wizard, rather than in a data centre chosen per location.

    Configure Webex Calling for your organization · Add a location, note on step 2 · Checked 2026-09-15
25. 25
    A location that holds a local gateway cannot be deleted while that local gateway is being used for other locations.

    Configure Webex Calling for your organization · Configure premises-based PSTN (Local Gateway) in Control Hub, closing note · Checked 2026-09-15
26. 26
    Mobile numbers are onboarded as inactive numbers and are activated when assigned to a user.

    Manage phone numbers in Control Hub · Add phone numbers, note on step 6 · Checked 2026-09-15
27. 27
    Without a main number, a location's trunks are not usable and its extension-only entities, including users, workspaces, virtual lines and features, can make and receive neither internal nor external calls.

    Manage phone numbers in Control Hub · Change the phone number for a location, note on step 5 · Checked 2026-09-15
28. 28
    A location using premises-based PSTN can select only 1 trunk, and the same trunk can be selected by more than 1 location.

    Configure Webex Calling for your organization · Create a trunk, Before you begin · Checked 2026-09-15
29. 29
    A Webex Calling location routing prefix may be 1 to 7 digits and the length includes the steering digit, so a routing prefix length of 4 leaves only 3 digits to identify the site.

    Configure Webex Calling for your organization · Configure Webex Calling dial plan, step 2, Location Routing Prefix Length · Checked 2026-09-15
30. 30
    Changing a location's time zone does not update the time zones of features associated with that location, and Cisco names auto attendant, hunt group and call queue as features whose time zone must be edited in each feature's own general settings.

    Configure Webex Calling for your organization · Update an existing location, note at the end of step 7 · Checked 2026-09-15
31. 31
    Cisco recommends updating a location's Emergency Callback Number when a toll-free number is chosen as the location main number, because a toll-free number does not have an emergency services address.

    Manage phone numbers in Control Hub · Change the phone number for a location, note on step 5 · Checked 2026-09-15
32. 32
    Cisco Calling Plans numbers may be ordered individually or as a Block Order in increments of 10, 50 or 100, an individual number ordered as part of a block cannot be deleted, and removing part of a block means deleting the whole block and ordering new numbers.

    Get Started with the Cisco Calling Plans · Cisco Calling Plans requirements and limitations, For New number ordering list · Checked 2026-09-15
33. 33
    When adding a location, Cisco states that the Cisco PSTN option is only visible if at least 1 committed Cisco Calling Plan Outbound Calling Plan has been purchased, the location is in a supported country, the organisation is hosted in a supported Webex Calling data centre region, and the location is new, because pre-existing locations that have had other PSTN capabilities assigned aren't eligible for the Cisco Calling Plan.disputed

    Configure Webex Calling for your organization · Add a location, step 5, Cisco PSTN bullet · Checked 2026-09-15
34. 34
    The organisation configuration article documents changing the PSTN connection of an existing location to Cisco PSTN, naming premises-based Local Gateway locations and non-integrated Cloud Connected PSTN locations as the starting points, and gives an 11-step Control Hub procedure for it.disputed

    Configure Webex Calling for your organization · Migrate to Cisco Calling plans, and How to initiate a PSTN connection change · Checked 2026-09-15
35. 35
    A Cisco Calling Plans order may carry a maximum of 100 new standard phone numbers, and further numbers must be placed as a separate order.

    Get Started with the Cisco Calling Plans · Cisco Calling Plans requirements and limitations, Limitations list · Checked 2026-09-15
36. 36
    While a location is undergoing a PSTN connection transition its numbers cannot be added, deleted, or moved in or out, while the existing numbers keep working and can still be assigned and unassigned.

    Configure Webex Calling for your organization · Migrate to Cisco Calling plans, paragraph beginning 'All portable numbers remain functional' · Checked 2026-09-15
37. 37
    The Calls to On-Premises Extensions setting is enabled per location and routes a call to an unknown extension of 2 to 10 digits to a selected trunk or route group as a premises call, where a caller identity that matches no dial plan pattern is what makes an extension unknown; the maximum unknown extension length is configurable over the same 2 to 10 digit range.

    Configure trunks, route groups, and dial plans for Webex Calling · Configure calls to on-premises extensions, Before you begin; and Configure call routing between Webex Calling and premises, step 5 · Checked 2026-09-15

Documents

Cite this page

WarmTransfer. (2026, September 16). Webex Calling locations and number management. WarmTransfer. https://warmtransfer.net/knowledge/webex-calling-locations-numbers

@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 2026-09-16}
}