DS TS 129 165 V13.10.0:2018

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Inter-IMS Network to Network Interface (NNI) (3GPP TS 29.165 version 13.10.0 Release 13)

Scope

The objective of this document is to address the Inter-IMS Network to Network Interface (II-NNI) consisting of Ici and
Izi reference points between IMS networks in order to support end-to-end service interoperability.
The present document addresses the issues related to control plane signalling (3GPP usage of SIP and SDP protocols,
required SIP header fields) as well as other interconnecting aspects like security, numbering/naming/addressing and
user plane issues as transport protocol, media and codecs actually covered in a widespread set of 3GPP specifications. A
profiling of the Inter-IMS Network to Network Interface (II-NNI) is also provided.
Charging aspects are addressed as far as SIP signalling is concerned.
SIP signalling traversing the NNI between a CSCF and MRB, e.g. for media control or Voice Interworking with
Enterprise IP-PBX, and SIP signalling traversing the NNI on the Mr interface between the CSCF and the MRFC, or on
the Mr' interface between the AS and MRFC, or on the Rc interface between AS and MRB is not considered in the
present release of this specification.
SIP signalling traversing the NNI between an application server and the remaining IMS functional entities (e.g. for
MCPTT interface SIP-2 in figure 7.3.1-2 in 3GPP TS 23.179 [200]) is not considered in the present release of this
specification.
SIP signalling traversing the NNI between an ISC gateway and an AS in an enterprise network, e.g. for media control
and voice interworking with enterprise IP-PBX, on the ISC interface between the ISC gateway and the enterprise
network is not considered in the present release of this specification.