I would suggest that the problem is with the connection of the base to your telephone line. That would give you the symptoms you describe. Check the wires you have been given. Was the phone made for your market?

The phone is connected to a voice over IP-connection through a ZyXEL Prestige 2602R-D1A router, where I previously have been using a Beocom 1401 with no problems, but when I connect the Beocom 4 base with the wire from Line to Phone 1 on the ZyXEL router, it says 'No contact with base'. But it says so no matter if it's connected or not, and I figured that it meant if the phone was in contact with the base and not if it was in contact with the telephone wire/signal, but perhaps I'm wrong about this?

Have you tried with just a normal phone line? B&O phones can be a little temperamental if not presented with a normal scenario!

No, I haven't had the chance yet, but I'll try that. So 'No contact with base' usually means that the phone can't get a connection with the phone signal?

Check how the cables are plugged into the t adaptor, it's easy to get them the wrong way around. 

The lead from the base/charger should plug into the adaptor socket marked "App", then the "power" and "line" leads are obvious.

Another check is to switch off the handset completely, then sit it on the base. It should switch on, you will see the red led blink.  If it doesn't switch on, it may be a prolem with the power supply. If there is no power to the base, you will get that message"no contact with base".

Opman

"No contact with base" means that the handset cannot find the base station. It has nothing to do with cables, VoIP etc. The message tells the user that the base station is out of reach. Since you've had no problems charging the handset, the base station is powered and the problem does not lie in the power adaptor or the cable.
Furthermore the message tells you that the handset is registered to the base station but cannot find it.

I have to recommend you to visit a dealer to let him try to re-register the handset to the base station. To me it sounds as if the base station is broken, but there is a chance that it's just the base station that has lost its registration data i.e. the base station does not recognize the handset and will not accept the handset.

The dealer should be able to re-register the handset.

I hope this helps.

Br,
Burnix

Hi there, I have recently discovered the same problem with my Beocom 4 (no contact with base)  and was wondering if you found a solution?  Cheers Alex