Y Shi - US Patent 7,948,955, 2011 - freepatentsonline.com
A subscription method and device based upon the session initiation protocol are disclosed, such that a function of permanent subscription and temporary subscription is achieved, and …
Y Shi - US Patent App. 12/017,423, 2008 - Google Patents
A subscription method and device based upon the session initiation protocol are disclosed, such that a function of permanent subscription and temporary subscription is achieved, and …
Y Shi - US Patent App. 12/017,423, 2008 - freepatentsonline.com
A subscription method and device based upon the session initiation protocol are disclosed, such that a function of permanent subscription and temporary subscription is achieved, and …