Thank you for the resources of this site. May I make one general suggestion: the mp3s are IMHO far, far too large for easy download and must represent a significant bandwidth and financial cost to you.
Suggest that you re-encode them as MPEG 2 Layer III CBR 24 kbit/s 22050 Hz Mono or smaller. (Use e.g. CDEX 1.70 beta 2 from sourceforge.net). This way e.g. your 45+MB file becomes around 8MB. 128kbit/s is way too HQ - after all, the original conversation is over the phone which must be about 11000 Hz or less(?)

cheers and good luck with your efforts.

Thanks. I will download these big files and repost them in smaller size.