In one embodiment, a method includes associating a pluggable policy module with an application when executing at a session layer device within a session over Internet Protocol (SoIP) network. A policy service request can be received at the session layer device from an endpoint in communication with the...http://www.google.com.hk/patents/US7774481?utm_source=gb-gplus-share專利 US7774481 - Methods and apparatus for implementing a pluggable policy module within a session over internet protocol network
