Step 1: Log in to your Zendesk Sell account and remain logged in.
Step 2: Now log in to your CallHippo account and go to the integrations tab.
Step 3: Click on Connect button of Zendesk Sell CRM.
Step 4: Now click on the authorise button.
Step 5: You should now be redirected to CallHippo account and you status would be changed to Integrated.