In our sandbox, all users are licensed for Webex Calling Professional. Most users have a PSTN Phone Numbers and Extension numbers assigned. A few users have only Extension numbers assigned (no PSTN numbers).
When two users with only Extension numbers assigned (i.e., no PSTN Phone Numbers assigned) make and receive calls to and from each other, there are no associated records contained in the API response. This is a shortcoming of the API as one would expect activity data for Webex point-to-point Calling (“Internal” calls) between properly configured users with Webex Calling Professional licensing to be included.
When a user with only an Extension number assigned (no PSTN Phone Number) makes a call to or receives a call from a user with a PSTN Phone Number assigned, both "ORIGINATING" and "TERMINATING" records are present in the API response package. See the records with "Correlation ID": "cba28c30-037b-4d9e-a747-ae1a30da5ae2" and "Correlation ID": "071ec545-098c-442d-88b6-5570647342cf" in the attached file for calls between the user at Extension 100 (without a PSTN Phone Number assignment) and the user at Extension 222 with PSTN Phone Number +13147481222. Internal calls should receive the same treatment.