Are your children included in the order of protection? If they are then he would be in violation of the order if he spoke to them. If they are not then he can speak to them, but they should not call from your phone.
If order of protection forbids father to speak with children, then he will be in violation. Otherwise, they can speak to him.
Disclaimer: Answer is not legal advice. An attorney-client relationship does not exist unless and until the attorney and the client execute a written engagement letter or retainer agreement.
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