A method for transmitting facsimile data between facsimile apparatuses each connected to a relay apparatus, and relay apparatuses being connected each other through an internet protocol network, includes steps of: performing an address conversion from a telephone number of a facsimile apparatus of the...http://www.google.de/patents/US6674541?utm_source=gb-gplus-sharePatent US6674541 - Method for transmitting facsimile data between facsimile apparatuses through an internet protocol network and relay apparatuses used in the method
