Are you able to try using either the External Phone Number Mask or setup any Calling Party Transformations from CUCM to the Edge / Expressway RP? I think it would be easier to manipulate the digits before it gets to Webex than to try and make Webex understand a 5 digit pattern.
By default Webex does not show the calling number even without Edge Audio. You can enable it under it on the site through Control Hub; however, it never displays calling name and masks the last few digits of the number eg “Call-in user 404555****”. If you want the participant to be fully identified they need to enter their participant code or use callback.
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Configuring Cloud Connected PSTN (CCP) – Easy as 1-2-3!
STEP 1: PREPARE
Before you can configure your CCP in Control Hub, you must procure PSTN services from an authorized Webex Calling CCP Partn...
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