Methods for implementing a message service based on IP Multimedia Subsystem (IMS) are disclosed in embodiments of the invention. One of the methods includes: determining a network domain of a called subscriber according to information in a message service of a calling subscriber; conducting the message...http://www.google.com/patents/US20070243876?utm_source=gb-gplus-sharePatent US20070243876 - Method and System for Implementing a Message Service Based on IP Multimedia Subsystem
