topic Re: extension mobility in Webex Calling

extension mobility

wagner — Thu, 17 Jul 2025 10:05:40 GMT

We try to migrate from CUCM to Webx Calling.

We use extension mobility for all users and thats a showstopper.

We habe 8851-Phones and we can't find a sollution.

Our users must have the possibility to login/logoff an phones without any extra Hardware like smartphones etc.

is there a way to config this featue like in CUCM? Or is there a way to emulate this feature via API? Something like

Foreach phone

$user = get.loggedinouser

reloggin($phone,$user)

Re: extension mobility

Jonathan Schulenberg — Thu, 17 Jul 2025 10:45:02 GMT

I’m not aware of an equivalent and this would run counter to a central design philosophy of the product: the user/workspace is the “center of gravity” that everything associates to: endpoints, lines, features, etc. You’ll need to discuss this with your Cisco account team.

Conceptually this will also increase your costs since every single phone would need to be a separate Workspace - and calling enterprise agreements only include those at 50% of the knowledge worker/user count before you need to buy add-on licenses. This is equally true with CUCM on paper but the product hasn’t done a good job of enforcing it.

Re: extension mobility

wajidhassan — Thu, 17 Jul 2025 11:26:18 GMT

Webex Calling does not support Extension Mobility like CUCM, where users can log in/out of shared desk phones with personal credentials. Webex's design centers on user identity, not shared endpoints. Each device is tied to a user or a workspace (like a common area), and this limits dynamic user switching.

Your current use case, 8851 phones shared by multiple users with long-term login persistence, is not directly supported. Emulating this with APIs is possible in theory but would be complex, error-prone, and likely unsupported.

To achieve similar functionality, each phone would need to be a dedicated Webex user or workspace, which increases license requirements and costs. For more flexibility or CUCM-like control, you might consider staying on-prem with CUCM or hybrid solutions.

Re: extension mobility

wagner — Thu, 24 Jul 2025 17:28:28 GMT

@Jonathan Schulenberg wrote:
the user/workspace is the “center of gravity” that everything associates to: endpoints, lines, features, etc.

Thats fine. But why is it not possible to assign endpoints for more than one day(hot desking) or 5 Days(hoteling)?