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Table of Contents for  TR 23.903  Word version:  19.0.0

0Introduction  p. 4
1Scope  p. 5
2References  p. 5
3Definitions, symbols and abbreviations  p. 5
3.1Definitions  p. 5
4Description of idle mode redial switching between voice and video  p. 6
4.1General Description  p. 6
4.2User initiated switching during an established call  p. 6
4.2.1Signalling flows and procedures  p. 6
4.2.2Future enhancements  p. 8
4.2.2.1Detection of video calling capability during a voice call  p. 8
4.3Fallback to voice during an established video call  p. 9
4.3.1Signalling flows and procedures  p. 9
4.3.1.1Fallback from UTRAN Video to UTRAN Voice call  p. 9
4.3.1.2Fallback from UTRAN Video to GERAN Voice call  p. 10
4.3.2Future enhancements  p. 11
4.3.2.1RRC behaviour following degradation of the video RAB  p. 11
4.3.2.2Interaction with voice mail servers  p. 11
4.4Fallback to voice during video call establishment  p. 11
4.4.1Signalling flows and procedures  p. 11
4.4.2Future enhancements  p. 13
4.4.2.1How to detect that a voice call might be successful?  p. 13
4.4.2.2How to avoid video mail box problems?  p. 13
4.5Automatic upgrade to video following fallback to voice  p. 13
5Interaction with Supplementary Services and other 3GPP Features  p. 14
5.1General  p. 14
5.2Calling Line Identity and Single Numbering Scheme  p. 14
5.3CAMEL based services triggered by call release and CCBS  p. 14
5.4Provision of Multi-Media "Ring Back" tones to the A party  p. 14
6O+M, charging and inter-operator and roaming accounting  p. 15
6.1Call Detail Records and statistics  p. 15
6.2Online charging  p. 15
6.3Tariffing  p. 15
6.4Inter-operator accounting  p. 16
6.5Roaming accounting  p. 16
AList of CRs needed to other TSs  p. 17
A.1General  p. 17
A.2CRs to other specifications already agreed by TSG Plenaries  p. 17
A.3Future CRs that are needed and/or are desirable  p. 17
$Change history  p. 18