Vodafone customer care staff have voted in favour of industrial action.
The Communications Workers Union said that the action is to protest the decisions to export almost 500 customer service jobs to locations in Northern Ireland, Egypt and India.
The CWU said that the moved show complete disregard for the impact on livelihoods.
The union said that an over-whelming number of staff at Dublin and Dundalk in Co Louth were in favour of the industrial action.