Check to see if there are unused wires in those rooms that are part of the phone wiring. 2 pairs in a CAT5 or anything even as crude as CAT3 will work great for IR and most keypads; check with the manufacturers for recommendations.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw