I am sure this has been discussed before but I can't find an answer based on my search words on the forum.

I moved my PSTN to another mains point so was switched off for about 15 minutes.  When I reconnected none of the phones are registered anymore (I have a Beocom 6000 MkII, Beocom 2 and Beocom 5) all working perfectly well before.

I understand the pins is requested if the PSTN thinks there are more than 6 handsets, but I have no idea how to unregister any of the phones or even reset the PSTN.

Any help most welcome.

Thanks

Dan