Patent ID: 9635062
Date: 2017-04-25
CPC Classifications: H04L

Claim:
1. A Proxy Call Session Control Function (P-CSCF) server for accessing an IP Multimedia Subsystem (IMS) via IMS signaling transported through a bearer layer, the bearer layer bearing one or more IP flows of media (media IP flows) and an IP flow of signaling (a signaling IP flow), wherein the Proxy Call Session Control Function server operates in a Policy and Charging Control (PCC) architecture and is configured to perform the following: establish, during registration of a subscriber with the IMS and prior to receiving media session information agreed to for the media, a signaling session for the subscriber, the signaling session being related to the signaling IP flow; send to a rules-control function device prior to receiving the media session information, a request for notifications of signaling session events related to the signaling IP flow, wherein the signaling IP flow is transported through the bearer layer, and the request includes signaling session information related to the signaling IP flow without the media session information related to the media IP flows; receive from the rules-control function device, a notification of a signaling session event detected on the signaling IP flow by an entity at the bearer layer; and inform the IMS of the detected signaling session event.