I am happy to answer this question, but would respectfully point out that I am just copying and pasting this answer from App Connect’s documentation. :)

App Connect can log calls in one of two ways:

• Incremental logging means that App Connect will attempt to log calls in near real-time. Logging begins the moment the call is connected, and then as the call progresses, and call artifacts are made available, the call log entry is updated with newer information.

• All-at-once logging means that App Connect will wait until all artifacts are ready before logging the call. This means that there could be a short delay in seeing the call being logged in the CRM. Users are free to enter and notes at any time. When the call is ready to log, any notes taken will be logged to the CRM.

This setting is orthogonal to automatic call logging, which just means that App Connect will attempt to log a phone call without human intervention.