method for establishing a communications session for user equipment is roaming in the IMS, the network, and network entity

摘要

invention, the calling subscriber present in the first visited IMS network, the second visit Method for establishing a communication session between the receiving subscriber is roaming within the first IMS network, Network and network entities. Method, the first visited IMS network, via the home IMS network of the receiving subscriber for the communication session via the media path extending to a second visited IMS network, the first INVITE including to route requests. The method further additional IMS network entities present in the second visited IMS network, the media path, it is inserted from the first visited IMS network portion that extends to the receiving side subscriber's home IMS network and includes the removal from the media path to the home IMS network of the receiving subscriber.BACKGROUND 14