A first Internet telephone system 620 attempts to call with a second Internet telephone system 630 via the Internet 600. However, the second Internet telephone system 630 is not logged onto the Internet at the time of the call. In response to the failed attempt to call, the first Internet telephone system...http://www.google.ca/patents/US6282269?utm_source=gb-gplus-sharePatent US6282269 - Voice mail on the internet
