Go to the eNature.com ringtones page and turn up your computer's speakers. Then play some of the ringtones that are available for download. Do this while your cats are napping nearby.
If your kitties are breathing, you'll get their attention! This is great fun and I've had my two cats circling my recliner hunting the birds, totally baffled as to where the feathered critters are hiding.
I've also downloaded several of eNature's birdsong ringtones for my phone. They work great,are free and really get my attention when somebody calls me. The birdsong drives my cubicle mates a little crazy but I don't get all that many calls so I'm not too concerned.
Check out eNature!