Thanks, I appreciate you time mflorell
OK, i've just tested MULTI option.
I loaded leads from excel with 4 different numbers, three of them were set up to have same vendor_lead_code.
Auto Alt-Number Dialing set for MULTI_LEAD and was able to modify their priority.
Problem is that dialer calls each lead no matter what status was set in previous lead (with the same vendor_code).
I though that vicidial in MULTI will treat all leads with the same vendor_code as one customer.
So when I've got few numbers and someone set OK dispo, dialer will stop trying alt numers around that vendor_code.