Zoiper 1.x will show multiple entries for one contact if that contact has multiple phones numbers (e.g. one for mobile, one for work, one for home etc.)
Zoiper 2.x (available in beta here) will no longer show multiple entries for the same contact.
Zoiper 1.x will show multiple entries for one contact if that contact has multiple phones numbers (e.g. one for mobile, one for work, one for home etc.)
Zoiper 2.x (available in beta here) will no longer show multiple entries for the same contact.