I'm definitely not as experienced as the other RETF keepers here but my little group is doing pretty well. :]

I think females will call back to a calling male if she's ready to lay her eggs, but none of my females have ever made any noises (or at least I haven't caught them doing it). But then, I have a pretty bad time telling them apart, so maaaaybe this one should left to someone with more skill. x] Sometimes I'll catch one up/hear it chirp during the day though. Usually it'll just change locations or readjust and go back to sleep.