use of voicemail if a WLAN-cell-phone is "powered-down"

[casch]

Hi,

I recommended voxalot to a befriended familiy together with an 'ebay-cheap' WLAN-cell-phone (TC300).

Now everything works fine. And when nobody is at home they switch off their WLAN-cell-phone.

But when I want to call them (voxalot to voxalot) while this cell-phone is switched off
I get immediately the busy-signal and not - what I would think - a connection to their
voicemailbox with voxalot.

Is this meant to be so? I would like to be connectedt to their mailbox,
e.g. to tell them to call me back when they are back?

On the other hand I do de-register my phone, when I am leaving (automatically done
when I shutdowm my pc) my little office and now incomming calls are directly
connetcted to my voicemailbox - this is perfect!


Carl