I have a AT&T Cordless phone that I don't have a owners manual for. It is a 5.8Ghz that has 4 handsets and is a couple of years old. I tried to record a new message for the answering machine part. People say that they hear it pick up... does not say anything and beep. I press record message and it says "record message after beep and when finished press stop." I do as instructed (I think)... no good. Model is E59478 (5.8Ghz Digital). Thanks for any assistance.