Hi Bridget. I'm John. I've had this happen to me before. What may have happened is that one of the telephone numbers Skype is using for the call to Ireland is behind what is known as a block of numbers reported to be abuse. You will need to contact Skype directly to see if they can hand you a different origination telephone number or have them check their database for abuse blocks.
If you don't want to go through Skype to get this resolved, you might try creating a new account which should provide a new number. The only drawback to this is that you'll have to add credit to this account before making the phone call.
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