The present disclosure is directed to syncing data related to voice calls via dynamically assigned virtual phone numbers. A system receives a voice call entry from a content provider. The system access a lot data structure to parse the log data structure. The system matches a device identifier of the voice call entry with a device identifier of the log entry. The system determines that a predetermined threshold is satisfied by a time or duration of the log entry. The system retrieves a virtual phone number from the log entry. The system performs a lookup to determine a content item impression identifier. The system stores data provided via the voice call entry.