Site administrators can turn on partial caller IDs for users dialing into meetings by phone only. When this feature is enabled, phone numbers for call-in users have the last four digits covered up with asterisks and look like this: "Call-in User_1 (+1234567****)." This feature doesn't impact people joining from the Webex Web App.
1

From the customer view in https://admin.webex.com , go to Services , and under Meeting , select Sites .

2

Choose the Webex site to change the settings for, and click Configure Site .

3

Under Common Settings , select Site Options .

4

Check the Display Caller ID for dial-in users when available check box, and then click Update .