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 
to download & install the SightCall Package
Step 2 Login to admin.sightcall.com
Step 3 Click on the "Services" tab in the left navigation bar
Step 4 Retrieve your Salesforce domain.
Step 5 Setup your Salesforce Service integration
Step 6 Add the SightCall component to a Salesforce App.
Step 7 Add SightCall Extension to your web browsers (or for anyone who will run this as the agent)
Step 8 (If not already taken care of) Install SightCall Plugin.
Step 9 Go to the App where you installed the SightCall Widget (e.g. Service Console) and open the SightCall Widget, you will be prompted to allow access (as an agent) to SightCall: (Look at the end of the browser's search bar - if this page is blocked as a pop-up, click on that to 'allow' / unblock it)
Step 10 You can now use SightCall in Salesforce
SightCall for Salesforce is now activated and ready to be utilized!