Hmm... interesting question.
If we come out of the general theory that the energy cannot be lost, but just changes from one form to another... Then I think that when you die, your bio-electricity(or as some people say - soul) can be dispersed all over the place and even the near LAN or power cables. This means that you(your electrical soul) could be VoIP conversation between your neighbour and his friends/ family for a few milliseconds or seconds.
That's how you really get "into" Zoiper. : )))))
Second proposal:SIP error 604 - Does not Exist Anywhere.