Comparing that to licensing around me that just means there is five pagers on the license. Here they have the pager receivers listed as 15, it covers all the pagers the FD and EMT's carry. I don't understand why they need to license a receiver?? But its included so it must need to be included for some reason.
If the frequency your listening to has a PL on it and your set to decode then you might be missing the pages that way, here when the page goes out there is no PL present, just the pager tones. I assume its done that way for a reason, though i'm not sure why. I do know that the radios in the vehicles have PL decode enabled, so it may be setup that way so that only the pagers are bothered by the page, those with a regular radio on wouldn't hear the tones and the page because their radio is listening for the PL.