Patent ID: 8493970

Claim:
A method comprising: receiving a subscribe message for a party from a communication network element at an event notification system; determining at least one service associated with the party at the event notification system; sending a service subscribe message from the event notification system to a corresponding service for each service of the at least one service; determining at the event notification system a pushed value for the party based on service pushed values received in response to each sent service subscribe message; sending the pushed value from the event notification system to the communication network element, wherein the pushed value is used by the communication network element to determine whether to invoke an internet protocol multimedia subsystem service for an incoming call to the party; receiving, at the event notification system, an updated service pushed value from a particular service when a service pushed value for the particular service changes; and sending the updated service pushed value to the communication network element when the updated service pushed value for the particular service changes the pushed value.