Ambulance staff will decide next Friday when they'll have their next strike.
500 paramedics from the Psychiatric Nurses' Association are on the picket-line until 2 o'clock this afternoon.
It's their second 24-hour strike over union recognition.
The HSE refuses to deal with the National Ambulance Service Representative Association, a branch of the PNA.
Sinead McGrath, Nasra's chairperson, says the campaign won't end today: