Stop Rejected Calls from Ringing Other Endpoints
The same extension can be signed in on several places at once: a desk phone, the desktop app, the mobile app, and a web browser. Each of those signed-in places is called an endpoint. By default, declining a call on one endpoint does not stop the others, so the call keeps ringing everywhere the extension is registered. Turning on all-reject mode makes a single rejection apply to every endpoint at the same time.
Turn on all-reject mode
Section titled “Turn on all-reject mode”-
Sign in to the Cloud Voice App desktop client and open Preferences > Features.
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Under Call, tick All Reject Mode for Endpoints.

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Select Save.
What happens next
Section titled “What happens next”Rejecting an incoming call on any one endpoint now stops every other endpoint from ringing. The call is then routed to the destination you have set for When Busy.