name: 3GPP TS 24.167
full_form: 3GPP Technical Specification 24.167
context: The UE mode of operation can change as a result of e.g.:
  -	a change of UE's usage setting for a CS voice capable UE;
  -	a change of voice domain preference for E-UTRAN as defined in 3GPPÂ TSÂ 24.167Â [13B] for a CS voice capable UE;
  -	a change in the UE's availability for voice calls in the IMS; or
  -	a change in UE configuration regarding the use of SMS as defined in 3GPPÂ TSÂ 24.167Â [13B].
  FigureÂ 4.3.2.1.1 and figureÂ 4.3.2.1.2 illustrate the transitions between different UE mode of operations when UE's usage settings, voice domain preference for E-UTRAN or configuration regarding SMS changes.
  NOTEÂ 1:	The UE may transit from CS/PS mode 1 to PS mode 1 or from CS/PS mode 2 to PS mode 2 if "CS domain not available" is received. After the transition to PS mode 1 or PS mode 2 due to "CS domain not available", the UE can transit back to CS/PS mode 1 or CS/PS mode 2, e.g. due to change of PLMN which is not in the list of the equivalent PLMNs.
  NOTEÂ 2:	Not all possible transitions are shown in this figure.
  Figure 4.3.2.1.1: Change of UE mode of operation for a CS voice capable UE
  NOTE:	Not all possible transitions are shown in this figure.
  Figure 4.3.2.1.2: Change of UE mode of operation for a UE with no CS voice capability
description: The 3GPP TS 24.167 specification provides technical requirements and guidelines for the implementation of SMS services in mobile networks.
explanation: 3GPP TS 24.167 is categorized as a Specification because it describes technical requirements for SMS service implementation.
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