Study on enhancements to IP Multimedia Subsystem (IMS) border functions for interconnection of IMS based services
The objective of this document is to analyse and identify enhancements needed in the current 3GPP IMS interconnection architecture driven by the needs that new business models/service delivery scenarios impose at the interconnection points of the IMS operators.
The present document will covers network to network interconnection as main objective and addresses the issues related to both control and user plane functionalities including:
- signalling treatment,
- numbering/naming/addressing,
- IP interworking,
- policy management,
- e2e QoS,
- transcoding,
- security,
- charging.
The purpose of this document is to formulate architectural solutions for the enhanced functionalities identified to cover all IMS operator’s needs in this widespread environment. These solutions should be applicable for an IMS operator in a common IMS environment (i.e. regardless the access being used) as well as for direct and indirect interconnection paradigms. Finally, the best solution/s should be agreed and impacted normative work in 3GPP identified to update current 3GPP specifications with the output of this work.