Australian Family Law — General Information
Short Answer
Only if the intervention order specifically allows communication. Contacting your ex in any way that is not permitted is a criminal offence.
IVO restrictions on parental contact
Perverse incentives in violence order system
Leading questions and self-incrimination
Can't use someone else to contact ex
Control mechanisms in communication orders
Court power to mandate communication apps
What communication is allowed?
Do not contact unless the order specifically allows it.