There is (was?) a program called Wintone that is supposed to decode
paging tones. I tried it a couple years ago and could not get it to work.
I don't know if it is still available or not. The url I had doesn't exist now.
If you want to generate tones, NCH Tone Generator will allow you to
make a single or 2 or more simultaneous tones either continuously
or specific duration and allows you to save them as .wav files.
http://www.nch.com.au/tonegen/index.html
They also have a tone dectector program but I have not used it.
Tom