Patent 7148982 was granted and assigned to RICOH COMPANY,LTD. on December, 2006 by the United States Patent and Trademark Office.
The present invention provides a gateway unit, a controlling method thereof and a communication system that realize a real-time network facsimile communication in a packet-PSTN network environment at a transmission speed set up between a facsimile apparatus and a partner terminal unit, wherein required network bandwidth corresponding to the transmission speed can be adjusted to be narrower than network bandwidth allocated by a gatekeeper unit.