Patent ID: 9504086
Filing Date: 2016-11-22
CPC Classification: H04L,H04W

Claim Text:
1. A method of routing a terminating call associated with a user equipment, UE, of a called user in a network comprising a circuit switched, CS, network and an IP Multimedia Subsystem, IMS, network, the method, performed by a first IMS node, comprising the steps of: receiving a Session Initiation Protocol, SIP, message from a second IMS node, the received SIP message including, in a route header of the received SIP message, a SIP Uniform Resource Identifier, URI, associated with the called user; detecting whether a service indicator representing the call services of the called user is included in the SIP URI; applying the service indicator to a plurality of policy rules for indicating whether the terminating call associated with the UE should be routed to the CS network and whether to suppress insertion of a prefix to a CS routing number for the UE of the called user; and transmitting a SIP message to a CS node and, when a routing policy rule associated with the service indicator indicates suppression of the prefix, including in the transmitted SIP message the CS routing number without the prefix.