FastCall can log a call to your Salesforce Opportunity or Case. In Fastcall settings look for Widget Settings, then Upgrade Features to add the functions to the FastCall widget. You can also add the option to relate multiple contacts to the Salesforce task. This needs to be enabled first by Salesforce, but we do support it. For example, if multiple contacts join a call, you can add them all to the Task.

Log Call - Case or Opportunity

Related a Task

Call Log Opportunity