A Home Subscriber Server (HSS) stores a service profile corresponding to a subscription of a user in a memory, and configures the service profile with data used by a Serving Call Session Control Function (S-CSCF) of an Internet Protocol Multimedia System (IMS) comprising the HSS. The HSS then sets, in the S-CSCF, a timer that controls processing of a service of the user by transmitting the service profile to the S-CSCF. The S-CSCF receives the service profile from the HSS, and uses the service profile to identify a rule comprising a timer value. The S-CSCF then controls processing of the service associated with the user by setting the timer in accordance with the timer value.