I agree with MrCustodyCoach. One additional suggestion would be to send your ex a letter (just one) certified mail. Outline your request for contact with your child, and suggest a schedule. For example, M-W-F at 7:45 p.m. Ask that, if she does not agree with the schedule she suggest an alternate arrangement. Then, unless you hear back from her, start calling at the times in your letter. Write your attempts down in your journal.
I think that this would be more helpful than calling and e-mailing constantly. It will show your willingness to work with her, and her unwillingness to do the same. You will have at least four weeks of attempting to call according to the suggested schedule. She won't be able to use the excuse that she wasn't there, it wasn't convenient, etc, etc. Your attorney will just have to ask why she didn't suggest an alternate schedule.