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Content for  TS 23.172  Word version:  18.0.0

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1  Scopep. 6

The present document describes the Service Change and UDI Fallback (SCUDIF) feature. This service is available to UDI/RDI multimedia calls and allows users to achieve successful call establishment when end to end circuit-switched (CS) multimedia is not possible (fallback to speech) or when signalling of the feature is not possible in the network (fallback to preferred service or speech). Furthermore, it allows the users to swap between a multimedia service and basic speech during an established call.
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2  Referencesp. 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 and/or edition number or version number) 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 23.153: "Out of Band Transcoder Control; Stage 2".
[3]
TS 24.008: "Mobile Radio Interface Layer 3 specification; Core network protocols; Stage 3".
[4]
TS 26.103: "Speech Codec List for GSM and UMTS".
[5]
TS 27.001: "General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)".
[6]
TS 29.007: "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
[7]
TS 29.205: "Application of Q.1900 series to bearer-independent circuit-switched core network architecture; Stage 3".
[8]
TS 22.101: "Service aspects; Service principles".
[9]
TS 33.106: "3GPP Security; Lawful Interception Requirements".
[10]
TS 23.018: "Basic Call Handling; Technical realization".
[11]
TS 23.003: "Numbering, adressing and identification".
[12]
TS 29.232: "Media Gateway Controller (MGC) - Media Gateway (MGW) Interface; Stage 3".
[13]
TS 26.102: "Mandatory Speech Codec; AMR Speech Codec; Interface to Iu, Uu, Nb".
[14]
TS 23.078: "Customised Applications for Mobile network Enhanced Logic (CAMEL) ; Stage 2".
[15]
TS 23.082: "Call Forwarding (CF) supplementary services, Stage 2".
[16]
TS 22.078: "Customised Applications for Mobile network Enhanced Logic (CAMEL); Service description, Stage 1".
[17]
TS 25.413: "UTRAN Iu interface RANAP signalling".
[18]
RFC 4040:  "RTP Payload Format for a 64 kbit/s Transparent Call"
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3  Definitions and abbreviationsp. 7

3.1  Definitionsp. 7

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply:
fallback:
when two services (multimedia and speech) are proposed but only one of them is available or wanted, only the service available (preferred or less preferred) is selected, and the other one is discarded
service change:
when two services (multimedia and speech) are available during the active state of a call, users may request a service change to switch between the two services
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3.2  Abbreviationsp. 7

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply:
BC
Bearer Capability
BC1
First Bearer Capability in a message (preferred service)
BC2
Second Bearer Capability in a message (less preferred service)
BCa
Bearer Capability of the currently selected service
BCb
Bearer Capability of the service to switch to
BCmm
Bearer Capability multimedia
BCSM
Basic Call State Model
BCsp
Bearer Capability speech
CAMEL
Customised Applications for Mobile network Enhanced Logic
DP
Detection Point
IE
Information Element
MMI
Man-Machine Interface
O-MSC
Originating MSC
OoBTC
Out-of-Band Transcoder Control
O-UE
Originating UE
RI
Repeat Indicator
SCUDIF
Service Change and UDI/RDI Fallback
T-MSC
Terminating MSC
T-UE
Terminating UE
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