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Content for  TS 24.228  Word version:  5.15.0

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1  ScopeWord‑p. 9

The present document gives examples of signalling flows for the IP multimedia call control based on SIP and SDP.
These signalling flows demonstrate the interaction with the IP-connectivity network (GPRS), and with the protocol provided at the Cx interface.
These signalling flows provide detailed signalling flows, which expand on the overview information flows provided in TS 23.228.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.228: "IP multimedia subsystem; Stage 2".
[3]
RFC 3261:  "SIP: Session Initiation Protocol".
[4]
RFC 2782:  "A DNS RR for specifying the location of services (DNS SRV)".
[5]
RFC 2806:  "URLs for Telephone Calls".
[6]
RFC 2916:  "E.164 number and DNS".
[7]
TS 33.203: "Access security for IP based services".
[8]
TS 23.060: "General Packet Radio Service (GPRS) Service description; Stage 2".
[9]
TS 29.207: "End to end Quality of Service (QoS); stage 3".
[10]
TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface".
[11]
TS 29.228: "IP Multimedia (IM) Subsystem Cx Interface; Signalling flows and message contents".
[12]
TS 24.008: "Mobile radio interface layer 3 specification; Core Network Protocols; Stage 3".
[13]
RFC 3323:  "A Privacy Mechanism for the Session Initiation Protocol (SIP)".
[14]
RFC 3263:  "Session Initiation Protocol (SIP): Locating SIP Servers".
[15A]
RFC 3315:  "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)".
[15B]
RFC 3319:  "Dynamic Host Configuration Protocol (DHCPv6) options for Session Initiation Protocol (SIP) servers".
[16]
TS 24.229: " IP Multimedia Call Control Protocol based on SIP and SDP; Stage3".
[17]
RFC 3325:  "Private Extensions to the Session Initiation Protocol (SIP) for Network Asserted Identity within Trusted Networks".
[18]
RFC 3310:  "Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA)".
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3  Definitions and abbreviationsWord‑p. 10

3.1  Definitions

For the purposes of the present document, the following terms and definitions apply:
IM CN subsystem:
(IP Multimedia CN subsystem) comprises of all CN elements for the provision of IP multimedia applications over IP multimedia sessions
IP multimedia session:
set of multimedia senders and receivers and the data streams flowing from senders to receivers. IP multimedia sessions are supported by the IP multimedia CN Subsystem and are enabled by IP connectivity bearers (e.g. GPRS as a bearer). A user may invoke concurrent IP multimedia sessions.
Stateful proxy:
logical entity that maintains state information at least for the duration of a SIP transaction, see RFC 3261 [3]
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3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply:
BGCF
Breakout Gateway Control Function
CN
Core Network
COPS
Common Open Policy Service
CSCF
Call Session Control Function
DHCP
Dynamic Host Configuration Protocol
DNS
Domain Name System
FQDN
Fully-Qualified Domain Name
G-MSC
Gateway Mobile Switching Centre
GGSN
Gateway GPRS Support Node
GPRS
General Packet Radio Service
HSS
Home Subscriber Server
I-CSCF
Interrogating-CSCF
IM
IP Multimedia
IP
Internet Protocol
IPv6
IP version 6
MEGACO
MEdia GAteway COntrol
MGCF
Media Gateway Control Function
MGW
Media Gateway
P-CSCF
Proxy-CSCF
PDF
Policy Decision Function
PDP
Packet Data Protocol
PSTN
Public Switched Telephone Network
QoS
Quality of Service
SBLP
Service-based local policy
S-CSCF
Serving-CSCF
SDP
Session Description Protocol
SGSN
Serving GPRS Support Node
SIP
Session Initiation Protocol
SS7
Signalling system no. 7
UAC
User Agent Client
UAS
User Agent Server
UE
User Equipment
URI
Uniform Resource Identifier
UMTS
Universal Mobile Telecommunications System
USIM
User Service Identity Module
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