Hi, Sorry for writing in English, but I can not speak German... I am using the 7170 for long time without problems. However, since a few months it is acting strange: a few times per week, I have no dial-tone (on none of the 3 Fon exits). However, I can still dial numbers, and people hear me speak - but I can not hear them. I solve it by power off and power on the box. But it's annoying, as this happens a few times per week. I always update to the latest (beta) firmware (currently 29.04.67), so I was thinking that that was the problem (as it only started a few months ago). So I tried to do a fresh "restore to default settings" + entering all the data manually again, but the problem remains :-( I also tried with a *completely different* 7170, and the problem still persists! Anyone knows what this could be? I think it's very strange, because it - happens on all my phones -> phones are ok - even happens with another 7170 -> so 7170 must be ok - even with resetting of all settings -> so settings can not be corrupt (because of firmware upgrades or so) Thanks for any help!