initial filter criteria evaluation method in a call termination call session control function in a subnet network ip multimedia system, call termination call session control function for use in a sub network ip multimedia system, application server, and method for processing a session initiation protocol message in a call termination call session control function in an ip multimedia sub system network. A method for evaluating initial filter criteria in a call termination call session control function in an ip network multimedia subsystem network. A session initiation protocol comprising a uniform destination resource identifier is received. As a result of applying an initial filter criteria to the message, the message is sent to an application server, evaluation of additional initial filter criteria is suspended. The resumed message is received from the application server, and a determination is made of whether the uniform resource identifier has been changed by the application server. if the uniform resource identifier has been changed by the application server, then the determination of whether resumes initial filter criteria evaluation is made, and if the uniform resource identifier has not been changed by the application server, then resumes evaluation of initial filter criteria.
展开▼
