Call attempts are mentioned in our reports. It's the opposite of connects and means calls that did not result in a conversation.
As Myphoner allows third-party phones for dialling, we also have a few options for best measuring connected vs attempted calls.
The primary factor is how we calculate "non-conclusive conversations", meaning calls where a conversation took place, but the lead was not won nor lost.
You'll find the settings for non-conclusive conversations under Manage -> Settings -> Reports.
Once we know when a call was an actual conversation, we also know when it was not, marked as an attempted call.
We assume a conversation occurs if the lead is won or lost.