Abstract:
The present invention provides a method and an apparatus for resuming the evaluation of initial Filter Criteria (iFC) at a specific point. Two new parameters are defined for inclusion in the service logic of application servers and serving Call Session Control Function (S-CSCF) servers. The first parameter, an iFC index parameter, is a number which indicates an index to a current specific position in the iFC evaluation. The S-CSCF may insert the iFC index parameter into route headers of SIP messages that originate from the S-CSCF to the application servers. The second parameter, an iFC resume parameter, is based on the iFC index parameter or another number along with an original dialog identifier, which the application servers may insert into route headers of SIP messages that originate from the application servers to the S-CSCF to indicate a desire to resume operations at the specific position in the iFC evaluation.