A telecommunication system and method are disclosed for employing a directory service or voicemail retrieval service over a telecommunication network. The telecommunication system includes a telecommunication device having a display for viewing textual information, the telecommunication device being...http://www.google.com.tw/patents/US20030133549?utm_source=gb-gplus-share專利 US20030133549 - Directory delivery system and method for a digital subscriber line modem
