Managing roaming agreements between IMS networks

摘要

A technique for managing an automatically established roaming agreement between two IMS networks (102, 104) is described, wherein one IMS network (102) supports multiple proxy nodes (302, 106) at the network edge towards the other IMS network (104). A method embodiment of the technique is performed in an I-CSCF (302) of the first IMS network (102) and comprises the steps of receiving (316) a registration request of an UE (306) via a second IMS network (104); sending (324) a roaming information request indicating the second IMS network (104) to a HSS (110) associated with the first IMS network (102); receiving (326) from the HSS (110) a roaming information answer indicating information related to the roaming agreement, and forwarding (328), based on the roaming information answer, the registration request to a second I-CSCF (106) of the first IMS network (102) managing the roaming agreement.

主权项

1. A method for managing an automatically established roaming agreement in a first Internet Protocol (IP) Multimedia Subsystem (IMS) network, the method being performed in a first edge proxy of the first IMS network and comprising:
receiving a registration request of a user terminal via a second IMS network; sending, based on the registration request, a roaming information request indicating the second IMS network to a user database associated with the first IMS network; receiving, in response to the roaming information request and from the user database, a roaming information answer indicating information related to the roaming agreement; forwarding, based on the roaming information answer, the registration request to a second edge proxy of the first IMS network, wherein the second edge proxy is configured to manage the roaming agreement between the first and second IMS networks; sending a routing permission request to the user database, the routing permission request requesting permission for routing the registration request to a user registrar of the first IMS network; and receiving, in response to the routing permission request, a rejecting routing permission response from the user database rejecting the requested permission; wherein sending the roaming information request to the user database comprises sending the roaming information request to the user database in response to the received rejecting routing permission response.