A really strange on this.

DrayTek 2820 IP PBX
Linksys SPA942 & 941 phones

Yesterday afternoon we answered our last successful incoming call.

Since then any call that rings in is not answered by picking the phone up in the usual way. It says connected and starts the call timer but the other partys phone continues to ring.

Putting the phone down does seem to terminate the call though.

We can call out OK

Honestly, we've changed nothing, nothing at all!

Fixed after discussion with DrayTek support.

Seems we were on 3.5.7 firmware and not 3.5.7.1 which fixes issues with Linksys / Cisco SPA phones.