National code to phone landline numbers in Ireland from Northern Ireland?

To phone a landline number in Ireland (country code 353) from Northern Ireland (country code 44), you need to dial the exit code for the UK (which is 00), followed by the country code for Ireland (which is 353), and then the landline number. For example, to call a landline number in Dublin (which has the area code 01), you would dial 00 353 1 1234567.