Dynamic determination of initial filter criteria

摘要

An IP multimedia subsystem comprises a CSCF and an HSS. The CSCF is configured to receive a SIP registration message transferred by a user communication device and responsively transfer a registration request to the HSS. The HSS is configured to process the registration request to obtain IFC for the user communication device, wherein the IFC comprises processing instructions that direct the CSCF to perform an operation to dynamically obtain and load data into the IFC. The CSCF is configured to receive a SIP invite message transferred by the user communication device, process text from the SIP invite message against a set of keywords to determine a dynamic parameter based on a keyword match, process one of the processing instructions in the IFC to obtain and load the dynamic parameter into the IFC, process the IFC with the dynamic parameter to determine a communication session parameter, and transfer a SIP message with the communication session parameter responsive to the SIP invite message.

主权项

1. A method of operating an internet protocol (IP) multimedia subsystem, the method comprising:
in a call session control function (CSCF), receiving a session initiation protocol (SIP) registration message transferred by a user communication device and responsively transferring a registration request to a home subscriber server (HSS); in the HSS, processing the registration request to obtain initial filter criteria (IFC) for the user communication device, wherein the IFC comprises processing instructions indicated using a markup language that direct the CSCF to perform an operation to dynamically obtain and load data into the IFC; in the CSCF, receiving a SIP invite message transferred by the user communication device; in the CSCF, processing text from the SIP invite message against a set of keywords to determine a dynamic parameter based on a keyword match; in the CSCF, processing one of the processing instructions in the IFC to obtain and load the dynamic parameter into the IFC; in the CSCF, processing the IFC with the dynamic parameter to determine a communication session parameter; and in the CSCF, transferring a SIP message with the communication session parameter responsive to the SIP invite message.