Call attempts are mentioned in our reports. Its defined as "Calls less than 15 seconds in duration" but that's not the whole story.
As myphoner uses third party phones for dialing, we do not collect data about the actual calls. All we can measure is the time it takes from an agent view a lead, until they action it (choose an outcome for the call).
If it takes less than 15 seconds from the lead is first loaded, until a Call back action is performed, we assume that it was probably not answered or went straight to voicemail. Therefore we say it is an attempted call.
Note that an attempt is not logged if you use the Archive action button.