A method and a device for switching the working mode of the media stream transition channel on a gateway. The method includes: detecting signals sent by data devices passing through the gateway, if the signals from common fax machines are detected, the media stream transition channel is switched to a...http://www.google.com.tw/patents/US20070053371?utm_source=gb-gplus-share專利 US20070053371 - Method and device for working mode switching of media stream transition channel on gateway
