Content for TS 24.615 Word version: 18.0.0
1 Scope p. 6
The present document specifies the stage 3, Protocol Description of the Communication Waiting (CW) service, based on stage 1 and stage 2 of the ISDN call waiting supplementary services. It provides the protocol details in the IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP) and the Session Description Protocol (SDP).
The Communication Waiting (CW) service enables a user to be informed, that very limited resources are available for an incoming communication. The user then has the choice of accepting, rejecting or ignoring the waiting call (as per basic call procedures).
The present document is applicable to User Equipment (UE) and Application Servers (AS) which are intended to support the CW supplementary service.
2 References p. 6
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]
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".
[2]
TS 24.229: "Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[3] Void.
[4]
TS 24.628: "Common Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification".
[5]
TS 24.610: "Communication HOLD (HOLD) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification".
[6]
TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1".
[7]
TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP) over the Ut interface for Manipulating Supplementary Services".
[8]
RFC 7462 (March 2015): "URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)".
[9]
RFC 5621 (September 2009): "Message Body Handling in the Session Initiation Protocol (SIP)".
[10]
TS 24.238: "Session Initiation Protocol (SIP) based user configuration".
[11]
RFC 6432 (November 2011): "Carrying Q.850 Codes in Reason Header Fields in SIP (Session Initiation Protocol) Responses".
[12]
RFC 3326 (December 2002): "The Reason Header Field for the Session Initiation Protocol (SIP)".
[13]
RFC 3023 (January 2001): "XML Media Types".
[14]
RFC 7044 (February 2014): "An Extension to the Session Initiation Protocol (SIP) for Request History Info".
[15]
RFC 3261 (June 2002): "SIP: Session Initiation Protocol".
[16]
RFC 3459 (January 2003): "Critical Content Multi-purpose Internet Mail Extensions (MIME) Parameter".
3 Definitions and abbreviations p. 7
3.1 Definitions p. 7
For definitions used in this document see:
- 3GPP TS 22.173
User B is the user who reacts to the communication waiting at subscriber B. User B is the served user for the communication waiting service.
User C:
User C is the user who has originated a communication to subscriber B which causes the CW supplementary service to be invoked.
User A:
User A is a user (several such users may exist) who is engaged in a communication with User B (this communication can be in any state).
Network determined user busy:
Approaching Network determined user busy:
User determined user busy:
See TS 22.228.
Network based CW:
CW when the network detects the CW condition and informs the UE about the conditon.
Terminal based CW:
CW when the UE detects the CW condition and informs the network about the condition.
3.2 Abbreviations p. 7
For the purposes of the present document, the following abbreviations apply:
AoC
Advice of Charge
CAT
Customized Alerting Tones
CCBS
Completion of Communication sessions to Busy Subscriber
CD
Communication Deflection
CDIV
Communication Diversion
CFB
Communication Forwarding Busy
CFNL
Communication Forwarding on Not Logged-in
CFNR
Communication Forwarding No Reply
CFU
Communication Forwarding Unconditional
FA
Flexible Alerting
OIP
Originating Identification Presentation
OIR
Originating Identification Restriction
TIP
Terminating Identification Presentation
TIR
Terminating Identification Restriction
CW
Communication Waiting
GRUU
Globally Routable User agent URI
HOLD
Communication Hold
IFC
Initial Filter Criteria
IMS
IP Multimedia Subsystem
IP
Internet Protocol
ISDN
Integrated Services Digital Network
MCID
Malicious Communication Identification
MiD
Multi-iDentity
MuD
Multi-Device
NDUB
Network Determined User Busy
SIP
Session Initiation Protocol
UDUB
User Determined User Busy
UE
User Equipment
