Chris presented the following explanation :
> Interestly, now when the SPA3000's PSTN port detects ringing, it rings
> my IP phone at home without going off-hook as I wanted, but it doesn't
> even go off-hook when I answer it! If I leave it to go off-hook whilst
> calling (as it used to), then the call is fine. It just means my PABX
> won't hunt to the next PABX extension if I don't answer the IP phone
> at home. Ho Hum!

What's your complete configuration? (pbx, phones, etc)