WhyByFlyer and OPEN DES
Slight clarification about PF's call "I have controls". PF and PNF is decided before the flight. If at the moment of abnormality occurring if PF is in control, he only calls "ECAM ACTIONS" and it also means he has communications till ECAM is completed. If PNF was at controls then only first "I have controls" call by PF is required. This is confirmed by Airbus.