The out of hours medical services in Offaly, Westmeath, and Longford.
Caredoc employees say the company has three weeks to respond to its threat of industrial action.
SIPTU and INMO members are prepared to withdraw their labour on the 18th of December in a dispute over pay.
They say money given by the HSE to the organisation for pay increases has not been passed onto staff.
Caredoc operates in 15 counties, mainly in the midlands, north west and south east.
Grainne Walsh from the INMO says they are prepared to stop working over Christmas to bring the company to the negotiating table:
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