Patent ID: 8873548

Claim:
A method, comprising: sending a first subscription message over a packet-switched network, using Session Initiation Protocol (SIP) event notification, to receive a call forwarding status notification associated with a call forwarding service of a user when a state associated with the call forwarding service changes; receiving a call forwarding status notification when a state associated with the call forwarding service changes; sending a second subscription message over the packet-switched network, using Session Initiation Protocol (SIP) event notification, to receive a call redirection notification associated with the call forwarding service of the user when a call has been forwarded; and interpreting the call forwarding status notification at a device locally coupled to a user interface of the user, wherein the device is capable of notifying the user when the call has been forwarded; wherein the first subscription message comprises a first field identifying the call forwarding service and a second field defining the format of the call forwarding status notification.