Patent ID: 9531817
Filing Date: 2016-12-27
CPC Classification: H04L

Claim Text:
1. In a telecommunications network, a method of providing interoperability between an Internet protocol multimedia subsystem (IMS) domain and a non-IMS domain, comprising the steps of: receiving on a service layer a service invocation message from the non-IMS domain; analyzing the message to identify the message as a request to invoke a service within the IMS domain; identifying whether or not the message relates to an ongoing session within the IMS domain by using a table listing currently ongoing sessions; converting, on a session control layer, non-IMS session control protocol elements related to the message into IMS session control related protocol elements; sending one or more messages towards the IMS domain to provide an IMS control session in the IMS domain based on the MS session control related protocol elements; and forwarding on the service layer the service invocation message using the IMS control session.