Refer to TS 23.002
for the definitions of some terms used in this document.
For the purposes of the present document the terms and definitions given in TR 21.905
and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905
For the purposes of the present document, the following terms and definitions given in TS 23.003
Distinct Public Service Identity
Public User Identity
Wildcarded Public User Identity
Wildcarded Service User Identity
Alias Public User Identities:
A set of Public User Identities that belong to the same alias group as specified in TS 29.228
Distinct Public User Identity:
Application Level Gateway (ALG) is an application specific functional entity that allows communication between disparate address realm or IP versions, e.g. an IPv6 node to communicate with an IPv4 node and vice versa, when certain applications carry network addresses in the payloads like SIP/SDP. NA(P)T-PT or NA(P)T is application unaware whereas ALGs are application specific translation entities that allow a host running an application to communicate transparently with another host running the same application but in a different IP version or IP address realm. See RFC 2663
for more details.
For IMS, an IMS ALG provides the necessary application function for SIP/SDP protocols in order to communicate between different address realms or IP versions, e.g. IPv6 and IPv4 SIP applications.
used in relation to wildcarded Public User/Service Identities to denote an explicitly provisioned Public User/Service Identity. See more details in TS 23.003
In the case that border control concepts are to be applied in an IM CN subsystem, then these are to be provided by capabilities within the IBCF, and the IBCF acts as an entry point for this network (instead of the I-CSCF). In this case the IBCF and the I-CSCF can be co-located as a single physical node. If border control concepts are not applied, then the I-CSCF is considered as an entry point of a network. If the P-CSCF is in the home network, then the I-CSCF is considered as an entry point for this document.
If operator preference requires the application of border control concepts then these are to be provided by capabilities within the IBCF, and requests sent towards another network are routed via a local network exit point (IBCF), which will then forward the request to the other network (discovering the entry point if necessary).
IP-Connectivity Access Network:
refers to the collection of network entities and interfaces that provides the underlying IP transport connectivity between the UE and the IMS entities. An example of an "IP-Connectivity Access Network" is GPRS.
A Subscriber is an entity (comprising one or more users) that is engaged in a Subscription with a service provider. The subscriber is allowed to subscribe and unsubscribe services, to register a user or a list of user authorized to enjoy these services, and also to set the limits relative to the use that users make of these services.
Inter-IMS Network to Network Interface:
The interface which is used to interconnect two IM CN subsystem networks. This interface is not constrained to a single protocol.
Network Address Translation (NA(P)T):
method by which IP addresses are mapped from one group to another, transparently to end users. Network Address Port Translation, or NA(P)T is a method by which many network addresses and their TCP/UDP (Transmission Control Protocol/User Datagram Protocol) ports are translated into a single network address and its TCP/UDP ports. See RFC 3022
for further details.
NAT-PT uses a pool of globally unique IPv4 addresses for assignment to IPv6 nodes on a dynamic basis as sessions are initiated across the IP version boundaries. NAT-PT binds addresses in IPv6 network with addresses in IPv4 network and vice versa to provide transparent routing between the two IP domains without requiring any changes to end points, like the UE. NAT-PT needs to track the sessions it supports and mandates that inbound and outbound data for a specific session traverse the same NAT-PT router.
NAPT-PT provides additional translation of transport identifier (e.g., TCP and UDP port numbers, ICMP query identifiers). This allows the transport identifiers of a number of IPv6 hosts to be multiplexed into the transport identifiers of a single assigned IPv4 address. See RFC 2766
for more details.
A unique identifier of transport-layer address, i.e. a combination of a network address, protocol identifier and port number. For example an IP address and a UDP port.
An IMS application is an application that uses an IMS communication service(s) in order to provide a specific service to the end-user. An IMS application utilises the IMS communication service(s) as they are specified without extending the definition of the IMS communication service(s).
IMS application reference:
An IMS application reference is the means by which an IMS communication service identifies an IMS application.
IMS communication service:
An IMS communication service is a type of communication defined by a service definition that specifies the rules and procedures and allowed medias for a specific type of communication and that utilises the IMS enablers.
IMS communication service identifier:
An IMS communication service identifier uniquely identifies the IMS communication service associated with the particular IMS request.
An IMS enabler is a set of IMS procedures that fulfils specific function. An IMS enabler may be used in conjunction with other IMS enablers in order to provide an IMS communication service.
An identifier, that uniquely identifies a specific UE amongst all other UEs registered with the same Public User Identity.
Local Service Number:
A local service number is a telephone number in non international format. A local service number is used to access a service that may be located in the home network of the user (home local service number) or the roamed network of the user (geo-local service number).
Geo-local service number:
A local service number that is used to access a service in the roamed network (a local service where the subscriber is located).
Home local service number:
A Geographical Identifier identifies a geographical area within a country or territory. See more details in clause E.8
A local service number is used to access a service that is located in the home network of the user.
HSS Group ID:
This refers to one or more SBI capable HSS instances managing a specific set of IMPIs/IMPUs.
IP-SM-GW (IP short message gateway):
Unidirectional flow of IP packets with the following properties:
same source IP address and port number;
same destination IP address and port number;
same transport protocol (port numbers are only applicable if used by the transport protocol).
An IP-SM-GW is an AS providing the support of Short Message Service of the IMS domain. See more details in TS 23.204
One or more IP flows carrying a single media instance, e.g., an audio stream or a video stream. In the context of this specification the term Media Flow is used instead of IP Flow regardless of whether the actual IP packet corresponds to media plane information (e.g. audio RTP flow) or control signalling (e.g. RTCP or SIP Signalling).
Based on TS 22.153
. Multimedia Priority Service allows authorized users to obtain and maintain radio and network resources with priority, also during national security or emergency situations when PLMN congestion may occur.
A session (e.g., voice, video, data session) for which priority treatment is applied for allocating and maintaining radio and network resources.
A UE having a USIM with MPS subscription.
Preferred Circuit Carrier Selection:
Managing Client Initiated Connections in the Session Initiation Protocol (Outbound) defines behaviours for User Agents, registrars and proxy servers that allow requests to be delivered on existing connections established by the User Agent. See RFC 5626
for further details.
An IMS service that allows the subscriber to select a long distance circuit carrier per call when dialling a call origination.
Preferred Circuit Carrier Access:
An IMS service that allows a specific long distance circuit carrier to be selected for a long distance call.
Simple Traversal of UDP Through NAT (STUN), provides a toolkit of functions. These functions allow entities behind a NAT to learn the address bindings allocated by the NAT, to keep those bindings open, and communicate with other STUN-aware devices to validate connectivity. See RFC 5389
for further details.
Is a usage of STUN, that allows a client to request an address on the STUN server itself, so that the STUN server acts as a relay. See IETF RFC 5766
for further details.
Is a usage of STUN, to keep NAT bindings open.