A communication method and device for preventing the media stream circuitry. The method includes the following steps: a signaling layer control function entity at the calling party side obtains the called party side information; the signaling layer control function entity routes the session signaling...http://www.google.com.tw/patents/US8108526?utm_source=gb-gplus-share專利 US8108526 - Communication method and device for preventing media stream circuitry
