Staff handed the phone to the victim believing the caller was a mental health professional.
But the Crown says it was actually Kumar. He spoke to the woman and was also able to convince her to give him her cellphone number.
He suggested she had been pressured to give false evidence.
Ms McClintock said Kumar asked the woman if she had any flashbacks.
"He put to her that she had fabricated her evidence.''
Later he suggested that there had been no sexual intercourse and that her caregivers had suggested the crimes had taken place.
"The Crown says even if Mr Kumar believed [the complainant] had been untruthful at trial, no matter what he thought of her evidence, he was not entitled to interfere with it.''
The trial, before Justice Geoffrey Venning, is continuing.