Did you open up the nurse call station to see how many pairs are being used?
9 pairs sounds abnormal to me - a nurse call system would typically have a pair for power and another pair for communications (RS-485/422 or some other similar communication protocol, perhaps proprietary). Maybe also a few pairs for relays or alarm inputs or something but... 9 pairs? This sounds like a wire that was installed that allowed for expansion in the future and would have a number of unused pairs. Or that they are used for something other than just the nurse call system.
I would verify both ends of that cable to be sure that there is nothing else connected to the wire before you decide to move anything. If the current nurse call station is only using the 2 pairs (power and communication, 22 AWG twisted/shielded), then you should check the minimum specifications from the manufacturer as to the cable type and use exactly that. I would be very surprised if the actual manufacturer cable spec was for a 9-pair twisted shielded 22 AWG cable for a nurse call.