Had a little trouble with hooking up early, went to call on but does not respond to it (just kept ringing the other side) ..
A bit difficult to get some good error info from the phone and the customer service was not so helpful.
But once it got started it so it works like clockwork, good sound, good battery time, easy ..
The only minus is that it feels plasticky and a little cheap, but so far it has kept good.
Run it against Bahnhofs IP telephony