SightCall for Salesforce is available from the Salesforce app exchange.
You can deploy it by following the steps below:
Step 1 - Go to the AppExchange and click on "Get it Now" to download the SightCall Package
Step 2 - Install package in your organization with Live Agent activated
Step 3 - Go through configuration steps and select the desired use case
Please refer to the SightCall for Salesforce Setup Guide (see link below) for detailed steps on how to configure the application. This same information is accessible in Salesforce once the application is installed by selecting the app and navigating to SightCall Setup | Documentation.