What is the pattern of intaqala in naqalahu fa-intaqala?

Characteristics of Form VII (Infiʿāl): Intransitivity, Manifestation, Resulting Action, Equivalence, Root Restrictions and Independent Use

• اِنْفَعَلَ
• تَفَعَّلَ
• فَاعَلَ
• اِفْتَعَلَ