Hey guys a mental exercise for FAA/ reserve stuff. Question. Is a pilot required under the contract or FAR's to be contactable during his/her 24 hour break?

Scenario

Finished trip and assigned 24 hour break. During break company calls and I don't answer (dont have to). When I come back on duty at 11am company says I have short call at 3pm. Aren't we required 12 hours heads up for short call or trip assignment?

ALPAs position is that even during the break I am contactable, but just not required to answer the phone but still obligated to the contractual 12 hour heads up.

I thought I was free from ALL duty during a 24 hour break? If they wanted me to fly a trip or start short call on returning to duty they had to assign it to me before the start of my break. Any takers?