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All of my users are in a mixed phone environment, they receive queue calls at anytime and direct dials. Users have no real way of quickly separating the two before they answer a physical phone.
You can use the Add Special Number feature, you can add numbers before (pre-appended) or after (post-appended) the incoming number to help you identify the call.
Click this link to know more https://support.ringcentral.com/article/4618.html.