How credits are used
AI Calling deducts one credit per call attempt that reaches the network: answered, voicemail, or ringing with no answer. AI Calling reserves the credit when it dispatches the call. hyzl refunds a call that never gets through automatically. Those are the statuses Failed, Cancelled, and DNC (filtered out by Do Not Call list).Contacts vs. call attempts
hyzl deducts a credit per call attempt, not per contact. A single contact can therefore use more than one credit. If a contact has fallback numbers (phone2, phone3, …), hyzl dials each number in turn until one connects. Every attempt that connects costs a credit. hyzl refunds attempts that do not connect, as usual.
This means a campaign’s credit cost can be higher than its contact count. When you reach the Send step, the portal shows the maximum number of calls the campaign could use. That maximum is contacts × multi-number dialing. If your remaining balance cannot cover it, the portal warns you before launch.

