In my outfit (HK based) its just "you have ATC1" for physiological breaks,talking with the cabin etc. He/she replies "I have ATC 1" for proper handover. If I have to contact the next FIR before a certain point as PM i will just say " Monitor ATC1" after telling the PF i am going off air. The when resuming primary comms again I say "I have ATC1" they say "You have ATC 1" and updates me on any changes.
For abnormals its the same as you quoted above.