Patent · US Active

Evaluating initial filter criteria

US8266302B2 · kind B2 · utility

4Cited by

0References

10Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Hubert Przybysz · Stuvsta-Snättringe, SE
Alf Heidermark · Hallsberg, SE
Timo Forsman · Ayacucho, PE

Key dates

Filing date	Jan 16, 2007
Grant date	Sep 11, 2012
Priority date	—
Expiry date	Nov 10, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH04L65/1104
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A method of evaluating Initial Filter Criteria (IFC) at a terminating Serving Call Session Control Function (S-CSCF) in an IP Multimedia Subsystem network. Upon receiving a Session Initiation Protocol (SIP) message containing a destination Uniform Resource Identifier (URI), the S-CSCF applies an Initial Filter Criterion to the message, sends the message to an Application Server (AS), and suspends further IFC evaluation. When a return message is received from the AS, the S-CSCF determines whether the AS changed the URI. If so, the S-CSCF makes a determination of whether to resume IFC evaluation. If the AS did not change the URI, the S-CSCF resumes IFC evaluation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.