If I'm being called back to work after a layoff, are they supposed to hire me back through the company or a temp agency?

Question Details:

I took a voluntary layoff on 01/18/09. I may be getting a call back to work here soon. The only thing is that they may want me to go back through a temp service. Are they supposed to hire me back through the company if I'm being called back to work from a layoff? And if so, am I supposed to get the same wage and benefits back upon returning to work?

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