Unfortunately, I'm not posting to show progress

. I seem to be in a holding pattern when it comes to continuing the build.
However, one thing has been puzzling me from time to time and it just occurred to ask you guys about it; one of my locos with crew radio chatter sounds will occasionally play a series of tones (sounds like what you would hear if dialing a phone) but no dialog.
If a visitor should ask me what that was...what the hell should I tell them?
Thanks